House-building budget checklist for Mexico: based on my Chiapas build
The item list behind my cost breakdown for the house I built in Chiapas, from the obvious lines to the easy-to-miss ones: the lime for the render, the street electricity connection, the gas regulator and, on a two-storey house, the slab between the floors.
Tick what your own build needs, then get local quotes for those lines. My prices for each section are on the cost page. One self-managed build, not a contractor’s quote or a national price list.
PlaceSan Cristóbal, Chiapas
BuildSelf-managed
Checklist52 items · 9 sections
✓ Paid itemsMostly 2024–26
✓ Paid on my build~ My estimate — check locallyQUOTE A quote I was given, not paid
How to use it
1 · Select
Tick the lines your build needs
2 · Price
Get local quotes and check what each one includes
3 · Add a margin
Add a contingency; my worked example uses 10–20%
My prices for each section are on the cost page. Your selections save in this browser, and the list prints.
The same items, with my paid prices and estimates where I have them, a column for yours, and a status for each line as it firms up: ~ estimate, then quote, then ✓ paid. The summary adds a contingency, shows the total in dollars, and tells you how much of your budget is still guesswork.
I’ll email you a link to download it (an .xlsx spreadsheet). New subscribers confirm their email address first. Signing up also adds you to my occasional newsletter about building and living in Chiapas. You can unsubscribe at any time.
Questions
Questions about budgeting a house build in Mexico
What should a budget for building a house in Mexico include?
Land paperwork and permits, the footings, the shell, the finishes (the liveable core first, floors and interior doors later), the electrics, the water system and the fixtures that are easy to leave out, plus anything your site needs, such as a well, a perimeter wall or work on a slope. The land itself is a separate line. The list above follows what I had to plan for on my own build in Chiapas.
Which costs are easiest to leave out of a house-building budget?
From my build: the render materials on top of the render labour, the street electricity connection, the kitchen counter and sink, the gas tank and regulator, stairs for a second storey, sealing a concrete roof and, on a two-storey house, the slab between the floors.
How much contingency should I add?
My worked example on the cost page adds 10–20% on top of the line-by-line total, for overruns, price changes and the surprises that come up on most builds.
Does this checklist include the land?
Yes, in section 9, as a line for your own budget. My cost page keeps it out of the house-building totals, because land prices swing too widely to fold in honestly. The land paperwork and permits are in section 1.
Written by Luke Burchell
I self-managed the construction of my own house in San Cristóbal de las Casas, Chiapas, and kept the receipts. This checklist is the item list behind my cost breakdown.
Captación de agua de lluvia en México: captarla fue lo fácil
Todo el que planea captar agua de lluvia se preocupa por no juntar suficiente. En mi terreno pasa justo lo contrario: en un aguacero fuerte puedo captar más agua de la que uso en toda una semana, y luego no cae nada durante meses. Vivir sin conexión a la red de agua no es, en realidad, un problema de captación. Es un problema de almacenamiento y de tiempos.
LugarSan Cristóbal, Chiapas
FuenteAgua de lluvia, sin red
AlmacenamientoCisterna de 10,000 L
Aguas residuales3 etapas, autoconstruido
FamiliaCuatro personas
Cómo funciona
Mi terreno no tenía conexión de agua. Así que la casa funciona con lluvia: captada de los techos, filtrada de forma sencilla, almacenada en una cisterna enterrada, bombeada hasta un tinaco y devuelta por gravedad — con el agua sucia filtrada otra vez en un sistema que construí yo mismo, a mano. Esto es lo que implicó armarlo, en qué me equivoqué y qué haría diferente.
Qué cubre
Esto está basado en una obra autogestionada en San Cristóbal de las Casas, Chiapas — no es un diseño de saneamiento, una norma de seguridad para agua potable ni una guía legal sobre derechos de agua. Es la mitad “fuera de la red” de la historia del agua: la pareja de mi guía sobre el sistema de agua para una casa en México, que cubre cómo llevar el agua hacia y a través de la casa — la cisterna, la bomba, el tinaco, la alimentación por gravedad y la elección entre tubería CPVC o TuboPlus. Esta página trata de dónde viene el agua y a dónde va después.
Filtro de aguas residuales de 3 etapas → pozo de absorción
Alrededor de 1,000–2,000 litros por semana para los cuatro.
El problema real
El verdadero problema del agua de lluvia no es captarla
Si estás planeando captar agua de lluvia en México, lo primero que hay que aprender es que captar la lluvia es la parte fácil. Antes de construir nada, pensaba que el agua de lluvia era, sobre todo, un tema de captación: apuntas el techo a un tambo y ya. Resultó que el verdadero reto eran otras tres cosas, y solo una de ellas es fácil.
Los tres retos del agua de lluvia
El reto
Por qué es más difícil de lo que parece
Qué hice
Sacar el agua del techo
Los techos casi nunca tienen una sola pendiente pareja, así que el agua no llega toda a donde la quieres.
El reto fácil — canaletas y tubería lo resuelven. Planéalo desde el diseño del techo, no como algo que se agrega después.
Filtrar lo bastante rápido
La lluvia torrencial llega toda de golpe; un filtro fino se tapa o se desborda y pierdes justo el aguacero que querías captar.
Filtro a propósito de forma gruesa en la captación — mantén el flujo alto, y limpia el agua más adelante en la cadena (ver abajo).
Guardarla durante los meses secos
Este es el verdadero límite. La lluvia llega en unos meses intensos, y luego hay poca el resto del año.
Dimensiona la cisterna para la sequía, no para el aguacero. El almacenamiento es todo.
La tercera fila es todo el juego. Mi techo de lámina — el que abastece la casa — mide cerca de 50 m² (5 × 10 m), y en los días más fuertes puedo captar hasta 5,000 litros en un solo día. Pero eso requiere una verdadera tormenta tropical: un milímetro de lluvia en un metro cuadrado es un litro, así que 5,000 litros de 50 m² significan unos 100 mm de lluvia en un día — algo que solo pasa un puñado de veces al año. Después de que terminan las lluvias, hacia mediados de noviembre, vives de lo que guardaste en octubre y noviembre, con apenas algunas lluvias ligeras y poco frecuentes hasta que llega la siguiente temporada de lluvias en mayo o junio. Ese largo tramo seco es justo la razón por la que la primera decisión de verdad es el almacenamiento — y no puedes dimensionar el almacenamiento hasta saber cuánta agua usas.
Uso de agua
Cuánta agua usamos de verdad los cuatro — empieza por la lavadora
No hay un solo número para cuánta agua usa una casa — hay un rango, y dónde caigas dentro de él depende de dos decisiones: cómo lavas la ropa, y qué tipo de excusado tienes. La mayoría empieza sus cuentas por la regadera y el excusado. La lavadora puede ser fácilmente el mayor consumo individual, y es la que de verdad exige moderación.
Lo sé porque llenamos la lavadora a mano — es una de tamaño normal tirando a chica — así que he medido lo que entra. Se lleva unos ridículos 70 litros en el ciclo de lavado, y otros 70 en el enjuague y centrifugado. El segundo ciclo no lo corremos: la ropa sale húmeda y se va directo al tendedero. Corre una lavadora común por los dos ciclos cinco veces a la semana y son 700 litros. Sáltate el enjuague y te ahorraste la mitad.
A dónde se va el agua — medido donde pude
Uso
Cada vez
Lo que suma para nosotros cuatro
Lavadora — ciclo de lavado
70 litros, medidos
Cinco cargas a la semana: 350 litros
Lavadora — enjuague y centrifugado
70 litros, medidos
Nos lo saltamos, así que nada. Córrelo y la ropa sube al doble: 700 litros
Regaderazo — rápido
unos 10 litros
Dos cada quien a la semana: unos 80 litros
Regaderazo — relajado
unos 20 litros
Uno diario cada quien serían 560 litros
Excusado — una descarga
unos 3.1 litros (botella de 600 ml dentro del tanque)
Cuatro descargas cada quien al día en casa: unos 350 litros a la semana
Todo lo demás — trastes, cocina, agua para beber, limpieza
sin medir
El resto de una semana frugal, que es más de la mitad. Lavar trastes puede usar tanta agua como una regadera, según tus llaves y cómo lo hagas
Las cifras de la lavadora están medidas, no buscadas en internet — cuando el agua la cargas tú mismo, sabes exactamente cuánta se lleva. Los números semanales son pura multiplicación a partir de ellas, así que cambia el hábito y el número se mueve con él.
El excusado es el que la gente sobreestima. La mayoría vamos entre seis y ocho veces al día; con ocho, cuatro personas y 3.1 litros por descarga son 99 litros diarios, que suena a mucho. Pero la mayor parte del día estamos en la escuela y el trabajo. Cuatro descargas cada quien en casa se acerca más a la verdad, y eso deja los excusados en unos 350 litros a la semana — más o menos lo mismo que la ropa saltándose el enjuague, y la mitad si se corre el enjuague.
Uso de agua por semana — dónde caes en el rango
Escenario (familia de cuatro)
Aproximado por semana
Qué supone
Frugal
~1,000 litros
Dos regaderazos rápidos cada quien, excusados de descarga reducida (~3.1 L), sin lavar ropa
Con lavandería
~2,000 litros
La misma familia, lavando ropa seguido y bañándose más — la ropa puede ser fácilmente la mayor parte del salto
Baño composta
~1,000 litros
Todavía no lo construyo — es mi siguiente trabajo si empezamos a quedarnos cortos. Devuelve los ~350 litros a la semana que usan los excusados: suficiente para bañarse más seguido y aun así quedar cerca de la cifra frugal
Sea cual sea tu número, eso es contra lo que hay que dimensionar la siguiente decisión.
Almacenamiento
Empieza por el almacenamiento — es lo más difícil de rehacer
Casi todo en un sistema de agua fuera de la red se puede ajustar después. La cisterna no, al menos no fácilmente. Es concreto colado bajo tierra, y vives con el tamaño que elegiste.
La mía es una cisterna de concreto de unos 10,000 litros. Funciona — ha sostenido a una familia de cuatro durante las temporadas secas, pero sin mucho margen. En papel, 10,000 litros a 1,000–2,000 por semana son de cinco a diez semanas, y la temporada seca aquí dura cerca de seis meses. Lo que cierra la brecha es que rara vez es seca del todo — dos o tres días de lluvia ligera cada par de meses devuelven algo — y que los tanques más chicos del techo de concreto cargan con la lavada.
Aun así, en su punto más bajo la cisterna ha llegado a estar 90% vacía. Fue a finales de abril de nuestra primera temporada seca, 2024–25, unas semanas antes de que suelan empezar las lluvias. Los tanques del techo de concreto todavía no existían, y el agua para lavar la ropa la subíamos del río en cubetas.
Si la volviera a colar, iría a 12,000–15,000 litros, porque el almacenamiento es lo que cierra la brecha entre los meses que llueve y los que no. Una vez que está hecha, agrandarla significa romper concreto. En 2025 agregué un segundo tinaco de 1,100 litros en el techo, que se llena desde la cisterna: ayuda, pero es un complemento, no una cisterna más grande. La construcción en sí — lo que costó, cómo está revestida — está en la guía del sistema de agua, junto con la bomba y los tinacos; aquí el punto es más simple: erra hacia lo grande. El almacenamiento es el seguro más barato contra una temporada seca larga, y lo más difícil de agregar en cantidad después.
Video (en inglés) · el almacenamiento, tanque por tanque
Todo el almacenamiento del terreno, en un solo recorrido: la cisterna enterrada de 10,000 litros, el tinaco al que se bombea, los Rotoplas más chicos que reciben el agua más sucia del techo de concreto, y el tambo enterrado en el jardín que sale del dren francés. Cada uno aparece en las secciones de abajo.
Cómo la dimensionaría yo
Calcula desde la temporada seca, no desde la lluvia
Toma la cifra semanal de la sección de arriba y compárala con el tramo más largo que esperes sin lluvia útil. Eso, con algo de margen, es tu cisterna. La mía es de 10,000 litros para una familia que usa entre 1,000 y 2,000 a la semana, y la colaría más grande. Son las cuentas de una sola casa, no un diseño — pero es el orden correcto para hacerlas.
Techos
A dónde va el agua de cada techo
No toda el agua de lluvia es igual, y el techo de donde viene decide para qué sirve. El agua de mi techo de lámina es notablemente más limpia que la que escurre del techo de concreto — así que las mando a trabajos distintos en lugar de mezclarlas.
Agua por techo — cada fuente a su trabajo
Fuente
Qué tan limpia
Para qué la uso
Techo de lámina
El escurrimiento más limpio
Alimenta la cisterna → se bombea al tinaco → cocina y baños
Techo de concreto
Más sucia, más porosa
Se manda a un tinaco Rotoplas aparte para lavar ropa
Drenaje francés
Escurrimiento de piso — con basura
Tambo enterrado en el jardín, para plantas y animales
Esta es una razón más por la que la decisión del techo y la decisión del agua están ligadas — el material que pones arriba cambia el agua que puedes captar abajo. Entro más a fondo en esa disyuntiva en techo de lámina vs techo de concreto en México. También es la razón por la que, si tu terreno no tiene conexión, el techo y la captación deben planearse juntos desde el inicio, no improvisarse después — el mismo punto que hago sobre comprar un terreno en México sin servicios.
Filtrado
El error es filtrar el agua de lluvia demasiado fino, demasiado pronto
Esta es la parte que no es intuitiva: en el punto de captación filtro menos, no más. Un filtro fino es justo lo peor cuando 5,000 litros quieren pasar en una tarde — se tapa, se atasca, y la lluvia que querías captar se va por la orilla.
Así que mi primer filtro es deliberadamente tosco: un tambo de 50 litros con piedras grandes (10–15 cm) abajo y piedras más chicas (unos 5 cm) arriba. Sin medio fino, nada que ahogue el flujo. Saca las hojas y la arenilla y deja pasar el volumen. La limpieza de verdad pasa más adelante en la cadena, donde no tiene que mantenerle el ritmo a un aguacero:
Mi cadena de filtrado — tosco primero, fino después
Tambo de plástico en el piso — saca la basura, mantiene el flujo alto
El filtro en línea que trae el tinaco Rotoplas — un segundo paso mientras se bombea el agua hacia arriba
Filtros de regadera baratos (de Amazon México) en el punto de uso
Un filtro de cocina para el agua que se bebe
Capta rápido y sucio. Limpia despacio y seguido.
La calidad me sorprendió. El agua no deja sarro en las regaderas, los lavabos ni los excusados, y para mi gusto sabe más limpia que el agua de la red — prefiero tomarla a depender solo de garrafones rellenados. Pero seré claro: el sabor no es una prueba de seguridad. Yo la tomo — sobre todo como té, así que va hervida — y no he tenido problemas, pero esa es mi experiencia en mi casa, no un consejo. El agua que escurre del techo puede traer bacterias y lo que sea que haya en tu techo. Si vas a tomar agua de lluvia, fíltrala y analízala bien, y trata el permiso de pozo y la calidad del agua como algo que hay que confirmar con alguien calificado para tu propio terreno.
Excedente
Planear para cuando sobra agua
El otro lado de captar 5,000 litros en un día es que, en temporada de lluvias, te sobra mucha más agua de la que puedes guardar o usar — y el agua que no diriges a propósito termina donde no la quieres. El techo de lámina llena la cisterna principal; mi techo de concreto y el drenaje francés pueden entregar más o menos lo mismo otra vez, pero los tanques a los que alimentan son chicos — un Rotoplas de 1,100 y uno de 500 litros — así que en un día de tormenta fuerte casi toda esa segunda corriente simplemente se desborda. Un tubo de desvío manda el excedente hacia la calle una vez que los tanques están llenos. Así que parte de tener un sistema fuera de la red es dirigir el excedente a propósito — y aceptar que vas a perder el resto.
Mi solución es sencilla y barata. Uso tubería de PVC con llaves en las uniones para poder cambiar el flujo de varias formas — desviándolo, por ejemplo, hacia un tambo enterrado en el jardín, para guardar agua para las plantas y los animales. En una pendiente, los drenajes franceses hacen el mismo trabajo con el escurrimiento de piso: alimentan el mismo almacenamiento en lugar de dejar que el agua abra canales en tu terreno.
Aguas residuales
La parte difícil que subestimé: las aguas residuales del baño
Pensé que el agua que sale de los baños iba a ser la parte fácil. Había leído sobre sistemas de filtración, visto videos, y pensé que sería cosa de excavar, poner tanques, agregar material filtrante y ya.
No fue así. Se volvió uno de los trabajos manuales más grandes de toda la obra.
El agua de lluvia se lleva toda la atención porque viene del techo, pero la otra mitad de un sistema de agua fuera de la red es qué pasa después de que el agua sale de la casa. En mi caso, las aguas residuales del baño pasan por un sistema de sedimentación y filtración en tres etapas que construí con materiales normales de ferretería — en parte porque no conseguí muchos de los materiales que veía recomendados en internet. Lo cuento aquí como un ejemplo de advertencia, no como un diseño para copiar.
Tres etapas, con tanques comunes
Las primeras dos etapas son tanques de plástico enterrados, de los que se usan para almacenar agua. El primero solo capta y sedimenta los sólidos. El segundo lo convertí en un filtro de flujo ascendente: el agua entra por tubería hasta el fondo, así que la única salida es subiendo otra vez por una cama de piedras filtrantes, sostenida sobre el piso del tanque por una plataforma improvisada con cubetas volteadas. Lo único que cambiaría es la malla de esa plataforma — usé acero porque era lo que conseguí localmente, pero se va a oxidar; plástico o acero inoxidable durarían más.
La última etapa es un tambo de plástico del mercado, lleno de piedra más grande (de 2.5 a 5 cm), como último filtro antes de que el agua se absorba en la tierra — en un pozo que rellené con piedra y escombro que sobró de la construcción.
El tanque que flotó
La primera lección fue sobre los tanques en sí. Fui barato y usé tanques normales de almacenamiento de agua en vez de tanques reforzados pensados para enterrarse — y un tanque vacío en un hoyo mojado no se queda donde lo pusiste. Para darles peso mientras trabajaba los llené a la mitad con agua; medio lleno me pareció más que suficiente. Luego, el primer aguacero fuerte del año llenó la excavación durante la noche, y a la mañana siguiente encontré un tanque flotando, levantado limpio de su lugar. Arreglar eso significó sacar el agua del hoyo inundado a mano, cubetazo por cubetazo — el tramo más miserable y desgastante de toda la obra.
Desde la obra · el tanque que flotó
La mañana después del primer aguacero fuerte del año: solo había llenado a la mitad los tanques enterrados de aguas residuales para darles peso, y uno flotó fuera del hoyo inundado durante la noche. La solución fue sacar el agua a mano, cubetazo por cubetazo.
Lo que me enseñó es a tratar un tanque de plástico enterrado como un problema de flotación y presión, no solo como un contenedor. Llenarlo a la mitad no fue suficiente — una vez que el hoyo se inundó, el tanque todavía tenía empuje suficiente para salirse de su lugar, y uno vacío podría ser aplastado por tierra saturada. Así que si lo volviera a hacer, lo llenaría hasta arriba antes de rellenar el hoyo, y lo mantendría lleno hasta que la tierra quedara bien apisonada alrededor.
Volver a entrar: el problema del acceso
La segunda lección fue el acceso. Iba improvisando mientras construía, y no había pensado cómo le haría el mantenimiento hasta que los tanques ya estaban enterrados. Eso se volvió un problema real, porque la tubería de aguas residuales de la casa quedaba mucho más profunda que el nivel del jardín. Así que no solo necesitaba hoyos profundos para los tanques — necesitaba una forma de crear una cavidad de acceso arriba de ellos, debajo del nivel del jardín.
Al final, le pedí al albañil que hiciera una pequeña estructura de concreto, como un techito, sobre los tanques, con dos losas de concreto removibles para entrar. Como todo iba a quedar enterrado bajo el jardín, puse llantas grandes de camión sobre las losas de acceso — gratis, de una llantera — para no tener que excavar el jardín cada vez que necesitara entrar. Después metí macetas grandes dentro de las llantas, con piedras alrededor, que escondieron toda la estructura por completo.
El sistema instalado + el acceso oculto
Los dos tanques de sedimentación ya conectados y colocados, con tapas, antes de rellenar — el primero capta y sedimenta los sólidos, el segundo le da al líquido una etapa más.La tapa de acceso que agregué después: concreto armado colado sobre los tanques, con dos aberturas enmarcadas para losas removibles, para poder entrar sin excavar el jardín.
Funciona, pero fue una solución improvisada. Si lo volviera a hacer, diseñaría el acceso a las aguas residuales antes de excavar cualquier cosa, y evitaría mandar el drenaje tan profundo dentro del jardín desde un inicio. Esa sola decisión le sumó costo, mano de obra y dificultad a todo lo que vino después.
Dos advertencias honestas, porque esta es la parte donde equivocarse tiene consecuencias. Primero, si lo volviera a construir, probablemente le pediría a un albañil que hiciera las etapas en concreto en lugar de tanques de plástico reutilizados — más capacidad, sobre todo para sólidos, y un sistema más durable en general. Segundo, subestimé muchísimo la mano de obra. Tomó meses de excavar, mover tierra y encontrar las piedras correctas para la filtración, y luego tener a un albañil construyendo ese techo enterrado alrededor de los tanques y la tubería. Esto no fue trabajo de un fin de semana.
Advertencia importante
Las aguas residuales son un tema de salud y de regulación
Estoy describiendo lo que construí para mi propia casa, no un diseño de saneamiento. Las aguas residuales del baño, las aguas grises y las aguas negras pueden estar reguladas, y los errores pueden causar problemas de salud. Trata esto como el sistema improvisado de una sola persona, y confirma el diseño, las distancias, el mantenimiento y los requisitos legales con alguien calificado para tu propio terreno.
La versión honesta
Mi sistema es híbrido — agua fuera de la red, comodidades normales
Déjame ser honesto sobre lo que esto es y lo que no es. No vivo un sueño de impacto cero. Tengo excusados de descarga — rompí la regla de “fuera de la red” de usar baño composta — aunque instalé el tanque más chico que encontré y le metí una botella de 600 ml adentro, lo que baja cada descarga a unos 3.1 litros. Uso una bomba con electricidad de la red. Esto no es ideología; es una casa sin conexión de agua, hecha para funcionar con lo que cae en el techo.
Pasé años trabajando en desarrollo internacional en zonas rurales de Guatemala — en un momento como especialista en innovación, donde probé una bolsa de almacenamiento de agua de lluvia de África que se montaba bajo un techo como una pequeña carpa. Abastecer a mi propia familia necesitaba algo mucho más robusto que esa bolsa, y un sistema de agua fuera de la red fue en lo que terminé.
Lo que cambiaría
Qué haría diferente
Colaría una cisterna más grande — de 12,000 a 15,000 litros — porque el almacenamiento es lo que te sostiene durante la temporada seca, y es lo único que no puedes agrandar fácilmente una vez construido. Planearía la captación y el techo juntos, en vez de tratar la recolección como algo que se agrega una vez levantada la casa. Y aceptaría más pronto que la parte que suena fácil (captar la lluvia) es trivial comparada con las partes que nadie se imagina: guardarla, dirigir el excedente, y lidiar con lo que sale de la casa.
Vivir con poca agua
Cómo se siente de verdad vivir con poca agua
La gente se imagina que vivir sin red de agua significa privaciones. Sobre todo significa atención — y el ahorro muchas veces se esconde en las tareas cotidianas, no en las obvias. La temporada seca ayuda más de lo que esperarías, además: rara vez es seca por completo, y esos dos o tres días de lluvia ligera de vez en cuando rinden mucho.
Lo que ganas a cambio de toda esta atención es independencia y, honestamente, mejor agua — suave, sin sarro, y que no llega en pipa. Lo que pierdes es la posibilidad de olvidarte del tema. Vigilas la cisterna durante los meses secos como otros vigilan el medidor de gasolina. Después de unos años, ya es solo un ritmo, no una carga.
Cómo se vivió eso en nuestros primeros años, de lavar la ropa en el río a un abril con la cisterna 90% vacía, lo cuento en mi historia sobre vivir con agua de lluvia (en inglés).
La lluvia es la parte fácil. Todo lo que decide si tienes agua en abril pasa antes de que caiga la primera gota.
¿Estás planeando el agua para un terreno sin conexión a la red?
Si tienes dudas sobre captación de lluvia, almacenamiento, tamaño de cisterna, techos o aguas residuales, la calculadora te puede ayudar a planear el resto de tu obra con cifras reales de mi propia casa en Chiapas.
¿De verdad se puede vivir en una casa con agua de lluvia en México?
En mi terreno en Chiapas, sí — sin conexión a la red, el agua de lluvia de los techos es mi fuente principal, almacenada en una cisterna de 10,000 litros y bombeada a un tinaco. Que te funcione a ti depende de tu lluvia, el área de tu techo, el tamaño del almacenamiento y cuánto dura tu temporada seca. El factor limitante casi siempre es el almacenamiento, no cuánta lluvia puedas captar.
¿Cuánta agua gasta una casa a la semana en México?
Para mi familia de cuatro en Chiapas, unos 1,000 litros a la semana cuando somos frugales — dos regaderazos rápidos cada quien y excusados de descarga reducida, sin lavar ropa — hasta unos 2,000 cuando lavamos ropa seguido y nos bañamos más. La ropa puede ser fácilmente el renglón más grande: un ciclo completo de lavado y enjuague en mi lavadora son 140 litros, medidos, así que cinco cargas son 700 litros ellas solas, o la mitad si te saltas el enjuague. Empieza tus propias cuentas por cómo vas a lavar la ropa, no por la regadera.
¿Qué tan grande debe ser una cisterna para vivir de agua de lluvia?
La mía tiene unos 10,000 litros y ha sostenido a una familia de cuatro (usando entre 1,000 y 2,000 litros a la semana, según la lavandería) durante las temporadas secas. Si la volviera a colar, iría a 12,000–15,000 litros para tener más margen. Dimensiónala contra tu tramo seco más largo, no contra un día de lluvia fuerte — y recuerda que es la única parte que no puedes agrandar fácilmente después.
¿Cómo se filtra el agua de lluvia para una casa?
Filtro tosco primero, fino después: un tambo lleno de piedra en la captación para mantener el flujo alto durante un aguacero, luego el filtro en línea del tinaco Rotoplas, y después filtros de regadera baratos y un filtro de cocina para el agua que se bebe. Un filtro fino en la captación simplemente se tapa con un aguacero. Para agua de beber en específico, fíltrala y analízala bien — que sepa limpia no es lo mismo que esté comprobada como segura.
¿El agua de lluvia de un techo de lámina es más limpia que la de uno de concreto?
En mi experiencia, claramente sí. El agua que escurre de mi techo de lámina es más limpia que la del techo de concreto, así que alimento la cisterna (y la casa) con el techo de lámina, y mando el agua del techo de concreto a un tanque aparte para lavar ropa. El material del techo y el agua que puedes captar son decisiones que van juntas.
¿Necesito permiso para un sistema de agua fuera de la red?
Captar agua de lluvia es una cosa; perforar un pozo profundo es otra — como residente extranjero entendí que necesitaba confirmar el permiso antes de perforar, y el agua está regulada. El manejo de aguas residuales también está sujeto a reglas. Yo trataría todo esto como algo que hay que confirmar con un abogado o la autoridad correspondiente para tu propio terreno, en lugar de suponer — estoy describiendo mi instalación, no la ley.
Escrito por Luke Burchell
Gestioné yo mismo la construcción de mi casa en San Cristóbal de las Casas, Chiapas, que funciona fuera de la red con agua de lluvia — captación, una cisterna de 10,000 litros, alimentación por gravedad, y un sistema de aguas residuales que construí a mano. Antes de eso pasé años en trabajo de desarrollo rural en Guatemala. Todo lo de aquí viene de esa experiencia: lo que construí, lo que cambiaría, y lo que planearía antes.
Off-grid water in Mexico: catching rain was the easy part
Everyone planning rainwater worries about catching enough. On my plot the opposite is true — in a hard downpour I can catch more than I can use in a week, and then nothing falls for months. Off-grid water isn’t really a collection problem. It’s a storage and timing problem.
PlaceSan Cristóbal, Chiapas
SourceRainwater, no mains
Storage10,000 L cistern
Wastewater3-stage, self-built
HouseholdFour people
How it works
My land came with no water connection. So the house runs on rain: caught off the roofs, filtered simply, stored in a buried cistern, pumped up to a roof tank, and fed back down by gravity — with the dirty water filtered again through a system I built by hand. This is what it took to set up, what I got wrong, and what I’d change.
What this covers
This is based on one self-managed build in San Cristóbal de las Casas, Chiapas — not a sanitation design, a drinking-water safety standard or a legal guide to water rights. It’s the off-grid half of the water story: the companion to my water system for a house in Mexico, which covers getting water into and through the house — cistern build, pump, roof tank, gravity feed and the CPVC-vs-TuboPlus pipe choice. This page is about where the water comes from and where it goes afterwards.
Around 1,000–2,000 litres a week for the four of us.
The real constraint
The real problem with rainwater isn’t catching it
If you’re planning rainwater harvesting in Mexico, the first thing to learn is that catching the rain is the easy part. Before I built anything, I thought rainwater was mostly about collection — point the roof at a barrel and you’re done. Three things turned out to be the real challenge, and only one of them is easy.
The three challenges of rainwater
The challenge
Why it’s harder than it looks
What I did
Getting the water off the roof
Roofs usually aren’t pitched evenly across a flat plane, so runoff doesn’t all arrive where you want it.
The easy one — gutters and routing solve it. Plan it into the roof rather than bolting it on later.
Filtering fast enough
Torrential rain arrives all at once; a fine filter clogs or overflows and you lose the very downpour you wanted to catch.
Deliberately under-filter at the catchment — keep flow high, clean the water later in the chain (below).
Storing it through the dry months
This is the real constraint. Rain comes in a few intense months, then little for the rest of the year.
Size the cistern for the drought, not the downpour. Storage is everything.
The third row is the whole game. My tin roof — the one that supplies the house — is about 50 m² (5 × 10 m), and on the heaviest days I can catch up to 5,000 litres from it in a single day. That takes a real tropical storm, though: a millimetre of rain on a square metre is a litre, so 5,000 litres off 50 m² means around 100 mm of rain in a day — which only happens a handful of times a year. After the rains end around mid-November, you’re living on what you stored through October and November, with only a handful of light, infrequent showers until the next wet season arrives in May or June. That long dry stretch is exactly why the first real decision is storage — and you can’t size storage until you know what you use.
Water use
How much water four of us actually use — start with the washing machine
There isn’t a single number for how much water a house uses — there’s a range, and where you land in it comes down to two choices: how you wash your clothes, and what kind of toilet you have. Most people start their sums with the shower and the toilet. The washing machine can easily be the biggest single use, and it’s the one that needs real moderation.
I know this because we fill our machine by hand — it’s an average-to-small one — so I’ve measured what goes in. It takes a ridiculous 70 litres for the wash cycle, and another 70 for the rinse and spin. We don’t run the second cycle: the clothes come out damp and go straight on the line. Run an ordinary machine through both cycles five times a week and that’s 700 litres. Skip the rinse and you’ve saved half of it.
Where the water goes — measured where I could
Use
Each time
What that adds up to for four of us
Washing machine — wash cycle
70 litres, measured
Five loads a week: 350 litres
Washing machine — rinse and spin
70 litres, measured
We skip it, so nothing. Run it and laundry doubles to 700 litres
Shower — quick
about 10 litres
Two each a week: about 80 litres
Shower — relaxing
about 20 litres
One each every day would be 560 litres
Toilet — one flush
about 3.1 litres (600 ml bottle in the tank)
Four flushes each a day at home: about 350 litres a week
The rest of a frugal week, which is over half of it. Dishes alone can use as much as a shower, depending on your taps and how you do it
The machine figures are measured, not looked up — when you carry the water in yourself you know exactly what it takes. The weekly numbers are just multiplication from those, so change the habit and the number moves with it.
The toilet is the one people overestimate. Most of us go six to eight times a day; at eight, four people and 3.1 litres a flush is 99 litres a day, which sounds like a lot. But we’re at school and work for most of it. Four flushes each at home is nearer the truth, and that puts the toilets at around 350 litres a week — about the same as the laundry with the rinse skipped, and half of it with the rinse run.
Water use per week — where you land in the range
Scenario (household of four)
Roughly per week
What it assumes
Frugal
~1,000 litres
Two quick showers each, reduced-flush toilets (~3.1 L), no clothes washing
With laundry
~2,000 litres
The same household, washing clothes regularly and showering more often — laundry can easily be the bigger part of the jump
Compost toilet
~1,000 litres
Not built yet — it’s my next job if we start running short. It gives back the ~350 litres a week the toilets use: enough to shower more often and still sit near the frugal figure
Whatever your own number turns out to be, that’s what the next decision has to be sized against.
Storage
Start with storage — it’s the hardest thing to redo
Almost everything in an off-grid water system can be adjusted later. The cistern can’t, at least not easily. It’s poured concrete in the ground, and you live with the size you chose.
Mine is a concrete-lined cisterna holding about 10,000 litres. It works — it has carried a family of four through the dry seasons, but not with much to spare. On paper, 10,000 litres at 1,000–2,000 a week is five to ten weeks, and the dry season here runs nearer six months. What closes the gap is that it’s rarely bone-dry — two or three days of light rain every couple of months put something back — and that the smaller tanks off the concrete roof carry the washing.
Even so, at its lowest the cistern has been about 90% empty. That was at the end of April in our first dry season, 2024–25, a few weeks before the rains usually start. The concrete-roof tanks didn’t exist yet, and our laundry water was still carried up from the river.
If I were pouring it again I’d go to 12,000–15,000 litres, because the storage is what bridges the gap between the months it pours and the months it doesn’t. Once it’s set, enlarging it means breaking concrete. In 2025 I added a second 1,100-litre tank on the roof, filled from the cistern: it helps, but it’s a top-up, not a bigger cistern. The build itself — what it cost, how it’s lined — sits in the water system guide alongside the pump and roof tanks; here the point is simpler: err bigger. Storage is the cheapest insurance against a long dry season, and the hardest thing to add in any quantity afterwards.
Video · the storage, tank by tank
Every bit of storage on the plot, filmed in one walk round: the buried 10,000-litre cistern, the roof tank it gets pumped up to, the smaller Rotoplas tanks that take the dirtier concrete-roof water, and the barrel buried in the garden off the French drain. Each one comes up in the sections below.
How I’d size it
Work backwards from the dry season, not from the rainfall
Take the weekly figure from the section above and hold it against the longest stretch you expect without useful rain. That, with some margin, is your cistern. Mine is 10,000 litres for a household using 1,000–2,000 a week, and I’d pour bigger. One house’s sums, not a design — but it’s the right order to do them in.
Roof routing
Which roof’s water goes where
Not all rainwater is equal, and the roof it comes off decides what it’s good for. Water from my lámina (tin) roof is noticeably cleaner than runoff from the concrete roof — so I route them to different jobs rather than mixing them.
Water by roof — each source to its job
Source
How clean
What I use it for
Tin (lámina) roof
Cleanest runoff
Feeds the cistern → pumped to the roof tank → kitchen and bathrooms
Concrete roof
Dirtier, more porous
Routed to a separate Rotoplas tank for washing clothes
French drain
Ground runoff — debris
Buried barrel in the garden for plants and animals
This is one more reason the roof decision and the water decision are tied together — the material you put overhead changes the water you can collect under it. I get into the wider trade-off in tin roof vs concrete roof in Mexico. It’s also why, if your land has no connection, the roof and the catchment should be planned together from the start, not stitched together afterwards — the same point I make about buying land in Mexico with no water on it.
Filtering
The mistake is filtering rainwater too finely, too soon
This is the counterintuitive part: at the point of catchment I filter less, not more. A fine filter is exactly the wrong thing when 5,000 litres wants through in an afternoon — it clogs, backs up, and the rain you were trying to catch runs off the edge.
So my first-stage filter is deliberately crude: a 50-litre drum with large stones (4–6 inches) at the bottom and smaller ones (around 2 inches) above. No fine media, nothing that chokes the flow. It takes out the leaves and grit and lets the volume through. The cleaning then happens further along the chain, where it doesn’t have to keep up with a downpour:
My filtering chain — crude first, finer later
Plastic drum on the ground — takes out debris, keeps the flow rate high
The inline filter that comes with the Rotoplas roof tank — a second pass as water is pumped up
Cheap shower filters (from Amazon Mexico) at the point of use
A kitchen filter for drinking water
Catch fast and dirty. Clean slowly and often.
The quality surprised me. The water leaves no hard-water scale in the showers, sinks or toilets, and to my taste it’s cleaner than the town supply — I’d rather drink it than rely entirely on refilled garrafones. But I’ll be straight: taste isn’t a safety test. I drink mine — mostly as tea, so it’s boiled — and I’ve had no problems, but that’s my experience in my house, not advice. Roof runoff can carry bacteria and whatever’s on your roof. If you’re drinking rainwater, filter and test it properly, and treat the well-permit and water-quality side as something to confirm with someone qualified for your own site.
Overflow
Planning for too much water
The flip side of catching 5,000 litres in a day is that, in the wet season, you have far more than you can store or use — and water you don’t direct deliberately ends up where you don’t want it. The tin roof fills the main cistern; my concrete roof and the French drain can deliver roughly as much again, but the tanks they feed are small — a 1,100- and a 500-litre Rotoplas — so on a big storm day most of that second stream just overflows. A diversion pipe sends the excess out to the street once the tanks are full. So part of an off-grid setup is routing the overflow on purpose — and accepting you’ll lose the rest.
My approach is low-tech and cheap. I run PVC tubing with taps at the junctions so I can switch the flow different ways — diverting it into a buried garden barrel, for instance, to keep water for the plants and animals. On a slope, French drains do the same job for ground runoff: they feed the same storage rather than letting the water cut channels across your land.
Wastewater
The hard part I underestimated: bathroom wastewater
I assumed the water leaving the bathrooms would be the easy part. I’d read about filtration systems, watched videos, and thought it would be a case of digging, placing tanks, adding filter material and moving on.
It wasn’t. It became one of the biggest manual jobs I took on during the whole build.
Rainwater gets most of the attention because it comes off the roof, but the other half of an off-grid water system is what happens after water leaves the house. In my case the bathroom wastewater goes through a three-stage settling and filtration system I built from ordinary hardware-store materials — partly because I couldn’t get many of the materials I saw recommended online. I’m setting it out here as a cautionary example, not a design to copy.
Three stages, built from ordinary tanks
The first two stages are buried plastic water-storage tanks. The first simply catches and settles the solids. The second I turned into an upflow filter: water is piped in at the very bottom, so the only way out is back up through a bed of filtration stones, held off the tank floor on a raised platform I improvised from upturned buckets. The one thing I’d change is the mesh in that platform — I used steel because it was what I could find locally, but it will rust, and plastic or stainless would last.
The final stage is a plastic barrel from the market, packed with larger 1–2 inch stone, as a last filter before the water soaks away into the ground — into a pit I backfilled with stone and rubble left over from the construction.
The tank that floated
The first lesson was about the tanks themselves. I went cheap and used standard plastic water-storage tanks rather than reinforced tanks made for burial — and an empty tank in a wet hole does not stay where you put it. To weigh them down while I worked I part-filled them with water; half full felt like more than enough. Then the first heavy downpour of the year filled the excavation overnight, and the next morning I found one tank floating in it, lifted clean out of position. Clearing that up meant bailing the flooded hole by hand, bucket by bucket — the most miserable, grinding stretch of the whole build.
From the build · the tank that floated
The morning after the first big downpour of the year: I’d only half-filled the buried wastewater tanks to weigh them down, and one floated up out of the flooded hole overnight. The fix was bailing the water out by hand, bucket by bucket.
What it taught me is to treat a buried plastic tank as a buoyancy and pressure problem, not just a container. Half-filling mine wasn’t enough — once the hole flooded, the tank still had enough buoyancy to lift out of position, and an empty one could be crushed by saturated soil instead. So if I were doing it again I’d fill it right to the top before backfilling and keep it full until the earth was packed tight around it.
Getting back in: the access problem
The second lesson was access. I was improvising as I built, and I hadn’t thought through how I’d do maintenance until the tanks were already in the ground. That became a real problem, because the wastewater pipes from the house ran much deeper than the level of the garden. So I didn’t just need deep holes for the tanks — I needed a way to create an access cavity above them, below garden level.
In the end I had the builder make a small roof-like concrete structure over the tanks, with two removable concrete slabs for access. Because the whole thing was going to be buried under the garden, I placed large used truck tyres over the access slabs — free from a tyre shop — so I wouldn’t have to dig up the garden every time I needed to get in. Then I put big plant pots inside the tyres, with stones around them, which hid the whole structure completely.
The installed system + the hidden access
The two settling tanks plumbed in and seated, lids on, before backfilling — the first catches and settles solids, the second gives the liquid another stage.The access cap I added afterwards: reinforced concrete poured over the tanks with two framed openings for removable slabs, so I could reach them without digging up the garden.
It works, but it was a workaround. If I were doing it again, I’d design the wastewater access before digging anything, and I’d avoid sending the drainage so deep into the garden in the first place. That one decision added cost, labour and difficulty to everything that followed.
Two honest caveats, because this is the part where getting it wrong has consequences. First, if I were building it again I’d probably have a mason build the stages in concrete rather than repurposed plastic tanks — more capacity, especially for solids, and a more durable system overall. Second, I badly underestimated the labour. It took months of digging, moving earth and finding the right rocks for the filtration, and then having a builder create that buried roof around the tanks and pipes. This was not a weekend job.
Important caution
Wastewater is a health and regulatory matter
I’m describing what I built for my own house, not a sanitation design. Bathroom wastewater, greywater and blackwater can be regulated, and mistakes can create health problems. Treat this as one person’s improvised system and confirm the design, distances, maintenance and legal requirements with someone qualified for your own site.
The honest version
My setup is hybrid — off-grid water, ordinary comforts
Let me be honest about what this is and isn’t. I’m not living a zero-impact dream. I have flush toilets — I broke the off-grid rule about composting — though I fitted the smallest tank I could find and dropped a 600 ml bottle inside it, which brings each flush down to about 3.1 litres. I run a pump on grid electricity. This isn’t ideology; it’s a house with no water connection, made to work on what falls on the roof.
I spent years on international-development work in rural Guatemala — at one point as an innovation specialist, where I tested a rainwater-storage bag from Africa that sat under a roof like a small tent. Supplying my own family needed something far more robust than that bag, and an off-grid water system is what I settled on. That work is also where I learned to design around how people actually live — it’s the story behind the woodstove I designed for the Guatemalan highlands.
What I’d change
What I’d do differently
I’d pour a bigger cistern — 12,000 to 15,000 litres — because storage is what carries you through the dry season and it’s the one thing you can’t easily enlarge once it’s built. I’d plan the catchment and the roof together rather than treating collection as something to add once the house was up. And I’d accept sooner that the easy-sounding part (catching rain) is trivial next to the parts nobody pictures: storing it, routing the excess, and dealing with what leaves the house.
Low-water living
What low-water living actually feels like
People imagine off-grid water means hardship. Mostly it means attention — and the savings often hide in the ordinary jobs rather than the obvious ones. The dry season helps more than you’d expect, too: it’s rarely completely dry, and the odd couple of days of light rain go a long way.
What you gain in exchange for all this attention is independence and, honestly, better water — soft, scale-free, and not trucked in. What you give up is the ability to forget about it. You watch the cistern through the dry months the way other people watch a fuel gauge. After a few years it’s just a rhythm, not a chore.
What that felt like in our first years, from washing clothes in the river to an April with the cistern 90% empty, is in my story about living on rainwater.
The rain is the easy part. Everything that decides whether you have water in April happens before the first drop falls.
FAQ
Common questions
Can you really run a house on rainwater in Mexico?
On my plot in Chiapas, yes — with no mains connection, rainwater off the roofs is my main supply, stored in a 10,000-litre cistern and pumped to a roof tank. Whether it works for you comes down to your rainfall, roof area, storage size and how long your dry season runs. The limiting factor is almost always storage, not how much rain you can catch.
How much water does a house use per week in Mexico?
For my household of four in Chiapas, about 1,000 litres a week when we’re frugal — two quick showers each and reduced-flush toilets, no clothes washing — up to around 2,000 once we’re washing clothes regularly and showering more. Laundry can easily be the biggest item: a full wash-and-rinse on my machine is 140 litres, measured, so five loads is 700 litres on their own, or half that if you skip the rinse. Start your own sums with how you’ll wash clothes, not with the shower.
How big a cistern do you need to live on rainwater?
Mine holds about 10,000 litres and has carried a family of four (using roughly 1,000–2,000 litres a week, depending on laundry) through the dry seasons. If I were pouring it again I’d go to 12,000–15,000 litres for more margin. Size it against your longest dry stretch, not against a heavy day of rain — and remember it’s the one part you can’t easily enlarge afterwards.
How do you filter rainwater for a house?
I filter crude-first, fine-later: a stone-filled drum at the catchment to keep the flow rate high in heavy rain, then the inline filter on the Rotoplas roof tank, then cheap shower filters and a kitchen filter for drinking. A fine filter at the catchment just clogs in a downpour. For drinking water specifically, filter and test it properly — clean-tasting isn’t the same as tested-safe.
Is rainwater off a tin roof cleaner than off concrete?
In my experience, clearly yes. Runoff from my tin (lámina) roof is cleaner than off the concrete roof, so I feed the cistern (and the house) from the tin roof and send concrete-roof water to a separate tank for washing clothes. The roof material and the water you can collect are linked decisions.
Do I need a permit for an off-grid water system?
Rainwater catchment is one thing; drilling a deep well (pozo profundo) is another — as a foreign resident I understood I needed to confirm permission before drilling, and water is regulated. Wastewater handling is also subject to rules. I’d treat all of this as something to confirm with a lawyer or the relevant authority for your own site rather than assume — in Mexico, water is regulated federally through CONAGUA. I’m describing my setup, not the law.
Written by Luke Burchell
I self-managed the construction of my own house in San Cristóbal de las Casas, Chiapas, which runs off-grid on rainwater — catchment, a 10,000-litre cistern, gravity feed, and a wastewater system I built by hand. Before that I spent years on rural-development work in Guatemala. Everything here is from that experience: what I built, what I’d change, and what I’d plan earlier.
Brick vs block in Mexico: why I used four wall materials
When I built my own house in San Cristóbal de las Casas, Chiapas, I didn’t pick one wall material and use it everywhere. I used brick, standard cement block, tabicón and a lightweight thermal block in different parts of the same house — because the right answer changed from wall to wall, with the sun, the shade, the weight and the budget. Most people ask it as a simple brick vs block question; in Mexico I found the better answer was to choose the material for each wall in turn. Here’s what each one cost, how each feels to live with, and where I’d use each again.
PlaceSan Cristóbal, Chiapas
MaterialsBrick · block · tabicón · thermal
PricesPaid 2024–26, per unit
Check locallyPrices vary ~30% by zone
Brick vs block: which was cheaper, and which felt better?
There’s no single best wall material here — there’s a best one for each wall. Standard cement block — the hollow concrete block that’s the default here — is the cheapest wall to build and a solid all-rounder. Brick costs the most per wall (it looks cheap per piece, but you lay far more of them) — its case is looks and comfort, not price. The lightweight thermal block I used is the priciest unit, and I put it on the walls that sit in shade all year. Tabicón sits in the middle.
If I had to give one rule: match the material to the wall’s exposure — thermal mass (block or brick) where the sun hits, lighter insulating block where it doesn’t — rather than buying one block for the whole house.
First, what I mean by “thermal block”
“Thermal block” is a slippery term — internationally it can mean AAC/aerated concrete (Hebel), fired-clay termoarcilla, or various lightweight blocks, and they don’t all behave the same. In this article it means the specific thing I was offered locally in Chiapas: a lightweight block made of pómez (pumice) — porous volcanic stone. That’s why it’s light and mildly insulating (less so than I thought it would be), and it’s not the same product as AAC, Hebel or termoarcilla. Treat everything below as my experience with the pómez block, not a verdict on every “thermal block” sold elsewhere.
From the actual build
Different wall materials on one self-managed build in San Cristóbal de las Casas, Chiapas — grey cement block, red-brick infill panels and concrete columns in the same house.
The line-up
The four wall materials I used
All four are common in Chiapas, all four went into my house. The ✓ unit prices are what I paid during my build, mostly in 2024–26, in Mexican pesos. I found some materials up to about 30% cheaper near where they were made. Prices move; check them against a local materialista before you plan around them.
What each is, and what it cost
Material
What it is
Each
Size
≈ pieces per m² of wall
Brick (tabique / ladrillo)
Fired clay; small, solid, traditional
✓ MX$7
26×7 cm
~45
Tabicón
Solid cement brick, bigger than clay brick
✓ MX$9
28×10 cm
~30
Hollow cement block
Standard hollow concrete block — the default here
✓ MX$15
~40×20 cm
~12
Thermal block (pómez)
Lightweight pumice-stone block
✓ MX$19
~40×20 cm
~12
The pieces-per-m² figures estimate how many units cover a square metre of wall; they are not costs. These are approximate wall-face calculations from the units I had locally — not manufacturer specs. They assume a 1.5 cm mortar joint; a brick wall runs roughly 3¾ bricks across and 12 courses up per square metre. One more solid block worth knowing: a cement-filled block (a hollow block filled with concrete) behaves much like tabicón in everything below.
Cost
Brick vs block cost: the cheapest unit makes the most expensive wall
Brick is the cheapest piece on the list and the dearest wall to build — that surprised me, and it’s the single most useful thing on this page.
Look at the per-unit prices and brick (MX$7) looks like the bargain. But you don’t buy a wall by the piece — you buy it by the square metre, and that’s where it flips. A square metre of wall takes about 45 bricks but only ~12 blocks. So even though each brick is half the price of a block, you’re laying nearly four times as many of them — and every one of those extra pieces needs mortar around it and a mason’s time to place it.
On my build that meant brick walls came out clearly the most expensive: more units, much more cement and sand for all the extra joints, and walling labour that worked out close to double. Standard cement block was the cheapest wall to build, precisely because each piece covers the most and you lay the fewest. Tabicón sits in between. The lightweight thermal block is the priciest unit (MX$19) and covers the same area as a block, so it’s the most expensive of the “big block” options — you’re paying for the pumice, not for coverage.
What doesn’t change with your choice
On my build, the reinforced-concrete framework — the castillos (columns) and cadenas (ties) — was a cost shared across the different wall materials. A different material or layout may require a different structural design. That’s what stops a brick house from simply costing several times a block one: you’re only paying the difference on the walling units, mortar and labour, not on the structure.
A reminder on the numbers: these are the Chiapas unit prices I paid during the build, mostly in 2024–26, and brick and thermal block in particular run up to about 30% cheaper near where they’re fabricated. When you compare quotes, ask where each material is actually made, not just the price per piece — a cheaper block loses its edge if it has to travel far, arrives broken, or is hard for your mason to resource. Treat them as a structure to compare with your own local quotes, not a national price list. The full build budget these came from is in the cost to build a house in Mexico breakdown.
Comfort
Brick, block and thermal block: how each one feels to live with
This is the part you can’t get from a spec sheet, and the reason I didn’t just build the cheapest wall everywhere. I have all four materials on adjacent walls of the same house, in the same climate — so this is a like-for-like comparison of how they feel through a warm Chiapas day and a cold night.
Warm day vs cold night
Material
Warm day
Cold night
Brick
Warms and cools gradually; evens out the day.
Holds a little warmth; the kindest to the touch of the four.
Hollow cement block
A touch cooler than brick.
Cools very quickly. Very cold by morning.
Tabicón
Warms up in direct sun; very cold in shade. Even in sun, cooler than brick.
Icy to the touch — but if it caught the day’s sun, it holds that warmth into the evening better than hollow block.
Thermal block (pómez)
Warms up only a little.
Surprisingly similar to hollow block.
The headline is that brick simply feels better to live with — cement block is noticeably cold to the touch, while brick absorbs and releases heat gently and takes the edges off both hot afternoons and cold mornings. That comfort, not cost, is the real reason to choose brick.
The thermal block surprised me — and not the way I expected
I’d assumed the pómez “thermal” block would feel noticeably warmer on a cold night. It doesn’t — those walls feel much like the hollow-block ones. Its job isn’t to store warmth (it’s light and low-mass) but to slow heat moving through the wall. So it earns its place on walls where you’re trying to stop warmth leaking out, not where you want a wall to soak up the day’s sun and radiate it back. Honest verdict: useful, but a quieter benefit than the name suggests.
Weight
Weight, structure and an earthquake zone
As a rough rule on my build, the heavier units felt more substantial — but they also put more weight into the structure holding them up.
A rough rule that helped me: heavier units (block, tabicón, brick) have more load-bearing capacity, but they also need a stronger structure to hold them up, which matters most on upper floors. The pómez thermal block is the odd one out here — it’s much lighter than cement block because it’s pumice. Living in an earthquake zone, I found it genuinely reassuring to have the lighter block high up in the house: less mass overhead is less to move in a quake. If I were choosing again, I’d be quicker to spend on the lightweight pómez block high up — where the weight saving counts most — than on a sunny ground-floor wall, where the mass of block or brick is actually useful.
Load-bearing capacity and structural design differ between these materials and with your own layout — this is my lived experience, not engineering advice. Confirm anything structural, especially on upper floors or a slope, with someone qualified for your build. For official background, see the CENAPRED guide to safer self-built housing, published by SEDATU.
Finish
Render, exposed brick, and a cost you can claw back
Most walls here get a cement render (aplanado) inside and out, and it’s one of the bigger line items late in the build. That’s where brick claws back some of its extra cost: brick doesn’t have to be rendered if you like the look of exposed brick, so a brick wall can be both the finish and the structure at once. I’ve used it that way as an interior feature — practical and good-looking, and you skip a whole render bill on that wall.
The render choice: lime mix or pure cement?
On the exterior you have a budget choice. A pure sand-and-cement render (no lime) is more water-resistant and needs no paint, which saves you both paint and the labour of painting — but it’s far more prone to cracking, and it doesn’t let the wall breathe. A 50% lime mix breathes and cracks less, which matters through San Cristóbal’s humid rainy season, when a wall that can’t breathe is more prone to trapping damp — but it does need painting.
And if you go with lime, there’s no rush on the paint: it can go on long after the render. Leave that decision — the cost, and choosing the perfect colour — for when the budget allows.
The decision
Which wall gets which material
This is the whole point of the page: I matched the material to what each wall had to do. Here’s the logic I used, and would use again.
Before you choose, ask of each wall
Does this wall get direct sun, or is it in shade all year?
Is it upstairs or carrying extra weight?
Will it be rendered, painted, or left exposed?
Is it a bedroom or living room where a cold wall matters?
Is the material fabricated nearby, or trucked in from another zone?
Sun-exposed walls
Thermal mass — block or brick
Walls that catch the sun want mass that can soak up the day’s heat and release it through the cold San Cristóbal evenings. Standard cement block does this; brick does it and feels nicer.
Year-round shade
Lightweight thermal (pómez)
Walls that never get sun aren’t going to store heat anyway, so the job is to slow heat escaping. That’s where the lighter pómez block earns its place — and its low weight is a bonus upstairs.
Walls you’ll see and feel
Brick
Where comfort and looks matter — a room you live in, a feature wall — brick’s gentle warmth and the option to leave it exposed (no render) make it worth the higher walling cost.
For everything else — the bulk of a normal house — standard cement block is the sensible default: cheapest to build, quick, and a perfectly good wall. I treated the other three as deliberate choices for specific walls, not as a whole-house material.
Decide this before the plumbing and wiring go in
Choosing materials wall by wall isn’t only about looks — it affects what you order, what gets rendered or left exposed, and where the plumbing and electrical chases can run. Settle the wall plan before those routes go in, not after. More on that in managing your own house build.
In hindsight
What I’d do differently
Two things. First, I’d plan the wall materials room by room from the start — sun exposure, shade, and which rooms actually need to stay warm — instead of deciding wall by wall as the build reached each one. The thinking is the same; doing it up front would have been cheaper to order and simpler to manage.
Second, my bedroom is built from hollow cement block and it’s freezing in winter. The fix I have planned isn’t to rebuild it — it’s to add external insulation to the outside of that wall, which slows the heat loss without losing the wall’s mass. If a room has to be warm and it’s already block, insulating the outside is usually easier than changing the wall.
Questions
Common questions
Is brick or block cheaper for building a house in Mexico?
Standard cement block is cheaper to build a wall with, even though a single brick costs less than a block. You lay about 45 bricks per square metre versus ~12 blocks, so brick means far more units, far more mortar, and roughly double the walling labour. On my Chiapas build brick was clearly the more expensive wall — its advantage is comfort and looks, not cost.
What is a “thermal block” (block térmico) in Mexico?
The one I used is a lightweight block made of pómez — pumice, a porous volcanic stone — which makes it light and mildly insulating. Be careful with the term: “thermal block” elsewhere can mean AAC/aerated concrete (Hebel) or fired-clay termoarcilla, which behave differently. Ask exactly what a supplier means by it locally.
What’s the difference between tabicón and a hollow block?
Tabicón is a solid cement brick (about 28×10 cm); a hollow block is the bigger, hollow concrete unit (about 40×20 cm) that’s the default here. The block covers more wall per piece, so it’s quicker and cheaper to build with; tabicón is smaller and denser. In how it feels day-to-night, tabicón behaves much like a cement-filled block.
Which wall material is best for a cold climate?
It depends on the wall. For walls that get sun, thermal mass — cement block or brick — soaks up daytime heat and releases it at night, which helped in the cold San Cristóbal winters. For walls in permanent shade, a lighter insulating block (the pómez “thermal” block) slows heat escaping. Brick feels the warmest to the touch of the four. There isn’t one “warmest” material — there’s a best one per wall.
Do I have to use the same block for the whole house?
No — and I didn’t. I used brick, cement block, tabicón and pómez thermal block in different parts of one house, matched to each wall’s sun and shade. Standard cement block is the sensible default for most of a house; the others are worth choosing deliberately for specific walls.
Is thermal block worth it?
In my experience, on the right wall. The pómez block didn’t make cold nights noticeably warmer — its benefit is slowing heat loss, not storing warmth — so it earns its place on shaded walls and high up, where its light weight also helps in an earthquake zone. I wouldn’t pay the premium to use it across a whole house.
Is tabicón the same as brick?
No. In local use, brick (also tabique or ladrillo) is the small fired-clay unit; tabicón is a larger, solid cement brick. They look related but they’re different materials, and they cost and behave differently — as the tables above show.
Is the pómez thermal block the same as Hebel or AAC?
No. The block I used is made of pómez — pumice, a porous volcanic stone. AAC / aerated concrete (sold under names like Hebel) and fired-clay termoarcilla are different products that perform differently. If a supplier offers a “thermal block,” ask exactly what it’s made of before comparing it to anything here.
I built and managed my own house in San Cristóbal de las Casas, Chiapas, using four different wall materials on the same house. The prices and the comfort comparisons here are from that build — what each one cost me, how each feels to live with, and where I’d use each again.
Cómo gestionar la construcción de tu casa en México: 10 cosas que aprendí en obra
Me hice cargo de la construcción de mi casa en San Cristóbal de las Casas, Chiapas — coordinando los materiales y a los albañiles, y corrigiendo los errores yo mismo, mientras trabajaba de tiempo completo. Esto no es una guía genérica de construcción. Son las cosas prácticas que solo se aprenden cuando tú eres el responsable de pedir el material, revisar el trabajo y mantener la obra avanzando.
LugarSan Cristóbal, Chiapas
ObraAutogestionada, por etapas
Útil paraQuien lleva su propia obra
VerificaPrecios y prácticas varían
La versión corta
Gestionar tu propia obra te puede ahorrar bastante dinero — pero el ahorro no es gratis. Lo pagas con tu atención. Te conviertes en el responsable de los materiales, los tiempos, el control de calidad y las decisiones del día — el trabajo que normalmente haría por ti un maestro de obra o un contratista. Gestionar no significa poner tú todos los blocks. Significa estar lo bastante cerca de la obra para que un problema chico no se vuelva caro. Estas son las diez lecciones que me costaron tiempo y dinero aprender.
Mi propia obra en San Cristóbal de las Casas, Chiapas — donde gestionar significó pedir materiales, revisar avances y detectar errores antes de que se volvieran caros.
Primero, lo básico
¿Qué significa gestionar tu propia obra?
Cuando digo que gestioné mi propia obra, no significa que yo puse cada block ni colé cada losa. Contraté albañiles y pagué a gente con oficio para lo que sabía hacer. La diferencia es que no le entregué todo el proyecto a un arquitecto, un contratista o un maestro de obra para esperar la casa terminada.
Yo era quien pedía los materiales, revisaba qué se había acabado, comparaba precios, preguntaba por qué se hacía algo de cierta manera y decidía qué podía esperar. Eso me dio más control sobre el presupuesto — pero también significó que las demoras y los errores eran míos para detectarlos a tiempo.
Esta página trata de ese punto medio: no hacerlo todo tú, pero tampoco desaparecer de la obra.
Gestionar la obra no significa hacerlo todo con tus manos. Significa que tú eres quien consigue, decide, revisa y empuja el trabajo para que la obra no avance a ciegas.
De un vistazo
Las diez lecciones, y por qué importa cada una
Cada lección es algo que hice mal, aprendí tarde, o solo entendí después de ya haberlo pagado.
Resumen
Lección
Por qué importa cuando tú llevas la obra
1. Controla tú el material
El precio de arena, grava y cemento puede variar ~15% según el contacto — y son de los materiales de mayor volumen.
2. Planea las ampliaciones antes de colar
Dejar varilla saliente hoy es gratis; unir concreto después es una junta débil que filtra.
3. Define el estándar del aplanado
Decide la mano de obra, el material, y si el aplanado sigue pegado en dos años.
4. No dejes que los clavos reciclados frenen la obra
Pagar mano de obra por enderezar clavos cuesta más que los clavos.
5. Guarda bien el cemento en lluvias
El cemento húmedo es dinero tirado.
6. Colado a mano vs revolvedora con pluma
Cuesta casi lo mismo; cambia la velocidad, el desmadre y la confianza en la mezcla.
7. Ten plástico listo antes de colar
Una losa que se seca muy rápido al sol se agrieta — y no hay vuelta atrás.
8. Aprende a usar el termofusor
Una herramienta de ~$400 te deja terminar tú mismo la plomería.
9. Aplana el exterior durante la obra, no después
Hacerlo años después es limpiar cemento de puertas, ventanas y pisos ya terminados.
10. Elige el muro por cómo se vive
El confort térmico se siente todos los días, no solo en la cotización.
Lección 01
Controla tú el material — y cuéntalo cada tarde
Quien controla tus contactos de arena, grava y cemento controla una buena parte de tu presupuesto.
La arena y la grava se compran por camionada. Mi primer albañil me preguntó si yo me encargaba de pedirlas; no sabía a quién llamar, así que quedamos en que él. Después entendí dos cosas. Al cambiar de albañil, el precio de estos materiales podía moverse como un 15% según el contacto — bastante, siendo de los materiales de mayor volumen de toda la obra. Y tener mi propio proveedor la segunda vez se sintió bien: le demuestra al albañil que sabes lo que haces. Hasta me han pedido mi contacto cuando les digo el precio que pago.
Las ferreterías chicas, que no son de cadena, a veces crecen como distribuidoras de cemento y suelen ser más baratas que las grandes — aunque tardan más en entregar. Compra el cemento por tonelada y la varilla por volumen: ahorras en los dos.
La otra mitad de la lección, y la que más repetiría: revisa la arena, la grava y el cemento al final de cada día. Si tú llevas la obra, los albañiles no te van a avisar hasta que ya se acabó, con la gente parada. Pide con al menos un día de anticipación; pide a media tarde para que el material tenga más chance de llegar antes del mediodía siguiente. Cuando estén armando los castillos y las cadenas, lo mismo con el alambrón, el alambre y los clavos.
Por qué es la lección número uno
Quedarse sin material es la forma más común de perder días en una obra que llevas tú — y de pagar gente parada. El remedio no cuesta nada: una vuelta de cinco minutos cada tarde y una llamada.
Lección 02
Planea las ampliaciones antes de colar
El momento más barato para planear una ampliación es antes de colar la primera losa — y es gratis.
Construí mi casa en dos etapas, así que me ha tocado unir concreto nuevo a uno ya existente. Hay dos cosas que conviene saber antes. Primero, si amarras una cadena nueva a una columna ya colada, es una unión débil. Algunos albañiles se niegan a hacerlo; otros lo hacen sin pensarlo. No te quedes con ninguna de las dos: pregúntale a un ingeniero.
Segundo, si ya sabes que vas a ampliar una losa después, pide que dejen varilla saliente de la cadena, perpendicular y lista, para poder unir la losa nueva estructuralmente. No cuesta nada ahora y es casi imposible de hacer después.
La advertencia que aprendí a las malas
Unir una losa de concreto nueva a una existente tiende a filtrar agua y humedad por la junta, por más cuidado que pongas. Yo estoy poniendo teja a lo largo de donde se juntan mis dos losas para que no entre la humedad. Planea que la junta sea un punto débil y resuélvela desde el diseño.
Lección 03
Define el estándar del aplanado antes de aceptar el precio
“Aplanado” puede significar dos muros muy distintos — y el más barato no queda derecho.
Tuve dos estándares de aplanado claramente distintos, de diferentes albañiles. En el primero, se aplana a plomo y se usa el reventón con disciplina, así que el muro queda derecho y a nivel en todo su largo. En el segundo, no se logra una superficie pareja a lo largo del muro. El segundo es más rápido, más fácil y gasta menos material — sobre todo donde el muro no está a plomo, porque el albañil no compensa con más mezcla. A los dos se les llama “aplanado”. Siempre pregunta cuál estás cotizando, o cuál te están dando — cambia mucho la mano de obra y cómo se ve la casa terminada.
Hay una segunda plática que conviene forzar, y es sobre la adherencia. El aplanado no pega bien sobre el concreto liso, y los castillos y las cadenas casi siempre quedan lisos. En Guatemala los albañiles pican la superficie con cincel para que el aplanado agarre; en Chiapas, en mi experiencia, eso se salta o se hace a medias. Hazlo un punto explícito: “¿cómo te vas a asegurar de que el aplanado no se caiga en uno o dos años?”
Lección 04
No dejes que los clavos reciclados frenen la obra
Reciclar está bien — menos los clavos en una obra activa.
Estoy a favor de reciclar y nunca lo discutiría en general. Pero todos los albañiles que he contratado se ponen a sacar clavos viejos de la madera y a enderezarlos para la siguiente etapa antes de pedir nuevos. Esa es mano de obra que estoy pagando, con tal de ahorrarme unos clavos que de por sí son baratos. Compra los clavos. Los viejos se pueden reciclar después del proyecto — cuando ya no están deteniendo tu obra.
Lección 05
Guarda bien el cemento en temporada de lluvias
El cemento a granel es un ahorro — hasta que le entra la humedad.
Si compraste cemento a granel para ahorrar, protégelo, sobre todo en lluvias. Mantenlo sobre tarimas, no en el piso, bajo techo, y cúbrelo con plástico — más aún si vas a tardar un par de semanas en usarlo todo. El cemento húmedo es dinero que ya tiraste. (Es una de varias razones para tener plástico en la obra antes de necesitarlo — ver la lección 7.)
Lección 06
Colado a mano o con revolvedora y pluma: por qué cambié
La mayoría de las losas en Chiapas se cuelan a mano. Mi entrepiso lo colaron cargando botes de concreto. Cuando le agregué cuartos a la parte de atrás, pagué una olla revolvedora con bomba sobre una pluma. Esto fue lo que vi.
Pensé que el precio iba a decidir — no fue así. Coticé las dos opciones y quedaron dentro de un 6% una de otra (y hasta eso es difícil de calcular, porque un colado a mano puede dejarte mezcla sobrante). En costo, es un empate. Las diferencias reales estaban en todo lo demás:
Factor
Gana
Lo que vi
Velocidad
Revolvedora y pluma
Unos 45 minutos, contra unas 3 horas a mano (según el tamaño de la losa).
Desmadre y mano de obra
Revolvedora y pluma
Un colado a mano son 15–20 personas dando vueltas en la obra mojada — a quienes luego les das de comer — y limpieza al día siguiente.
La cimbra
Colado a mano
La pluma deja caer el concreto desde arriba, así que la cimbra de madera tiene que ir más reforzada.
Confianza en la mezcla
Revolvedora y pluma
A mano, con tanta gente mezclando, la proporción varía y en lluvias se mete lodo a la mezcla. Confié más en la revolvedora.
Una aclaración honesta
¿Cuál de mis losas se agrietó? La de la revolvedora. Pero dudo que haya sido la mezcla — lo más probable es un movimiento en la estructura de apoyo y el sol intenso justo después del colado (ver la lección 7). Aun así elegí la revolvedora la segunda vez, y lo volvería a hacer.
Lección 07
Ten plástico listo antes de colar
Una losa cura mientras se mantiene húmeda. Al sol directo, no puede — a menos que lo hayas previsto.
Si cuelas una losa — y puede que te toque hacer parte tú mismo — cúbrela, sobre todo si el techo o el piso queda al sol todo el día. Algo que hacen en Guatemala y que no he visto en México es levantar un bordito de mezcla en la orilla de la losa al colarla, para encharcar agua encima y mantenerla húmeda mientras cura. Mi losa quedó al descubierto y, por más que traté de mantenerla mojada, es casi imposible sin algo que detenga el agua. El plástico le da sombra del peor sol y ayuda a retener la humedad. Ojalá lo hubiera hecho.
Cuando no estás curando una losa, esos mismos plásticos sirven: para tapar los bultos de cemento (lección 5), y para proteger lo que no quieres manchar — ladrillo, piedra, pisos ya puestos — mientras aplanas.
Lección 08
Aprende una habilidad sencilla: el termofusor
Por unos $400 puedes hacer tus propias uniones de plomería. No hay habilidad de construcción con menos barrera de entrada.
Puedes comprar un termofusor chino en Amazon — como yo — por unos $400, y funcionan perfecto. No hay habilidad de construcción y mantenimiento más barata ni más fácil de aprender que unir tubería de agua de ½”. En YouTube están los pocos pasos básicos, puedes practicar por casi nada, y como mínimo te deja terminar tú las conexiones del baño y la cocina cuando instales los lavabos y el WC.
Lección 09
Aplana el exterior durante la obra, no años después
Aplanar es un trabajo sucio. Hazlo antes de que haya algo terminado que arruinar.
El exterior de mi casa lo aplané dos años después de terminar lo demás, porque en su momento no me alcanzaba el presupuesto. No me arrepiento de haber esperado — pero no es una buena experiencia. Aplanar es un desmadre, con cemento volando por todos lados; hasta el gato se aleja cuando los albañiles están en eso. Hacerlo tarde significó limpiar cemento de puertas y ventanas ya puestas, y andar cuidando las pisadas y las salpicaduras sobre las lajas del jardín. Si de plano puedes aplanar el exterior mientras la obra todavía está en bruto, hazlo — tus puertas, ventanas, andadores y cochera te lo van a agradecer.
Lección 10
Elige el material del muro por cómo se vive, no solo por el precio
Usé block hueco, tabique, block de cemento (tabicón) y block térmico en muros contiguos de la misma casa — así que puedo comparar no las fichas técnicas, sino cómo se sienten al vivir en ellos durante un día caluroso y una noche fría en Chiapas. Aquí hablo del confort; para cuál salió más barato, ese es otro tema.
Primero una regla útil: entre más pesado el material, más carga aguanta, pero más fuerte tiene que ser la estructura que lo sostiene — lo que más importa en los niveles altos. Dejando el peso de lado, así se siente cada uno:
Cómo se siente cada muro, de día y de noche
Material del muro
Día caluroso
Noche fría
Block hueco de cemento
Un poco más fresco que el tabique rojo.
Se enfría muy rápido. Muy frío en la mañana.
Tabicón (de cemento)
Se calienta si le da el sol; muy frío a la sombra. Aun con sol, más fresco que mis muros de tabique rojo.
Helado al tacto — pero si se calentó con el sol del día, mucho más cálido que el block hueco.
Block relleno de concreto
Igual que el tabicón.
Igual que el tabicón.
Block térmico
Se calienta solo un poquito.
Se siente muy parecido al block hueco.
La sorpresa en mi propia casa: la ventaja del block térmico para conservar el calor en las noches frías no es tan evidente como esperaba — esos muros casi siempre se sienten fríos, muy parecido al block hueco. Pero lo usé a propósito. Los muros que están a la sombra todo el año son de block térmico, donde el trabajo es frenar que el calor se escape de la casa, no atrapar el sol. No puedo afirmar con honestidad que haga una diferencia enorme, pero creo que ayuda — y si tuviera una chimenea, esperaría que ayudara a que el calor no se escape por los muros exteriores mejor que las otras opciones. Viviendo en zona sísmica, también tranquiliza que el block térmico, en lo alto de la casa, sea mucho más ligero que el block de cemento.
Lo que haría después
El muro de block hueco de mi recámara es helado en invierno, así que tengo pensado ponerle aislamiento térmico por fuera. Si volviera a empezar, pensaría el material muro por muro — exposición al sol, sombra, y qué cuartos de verdad necesitas calientes — en vez de elegir un solo block para toda la casa.
Esto es experiencia de vivirlo, no asesoría estructural — la capacidad de carga cambia entre estos materiales, así que confirma lo estructural con alguien calificado para tu propio diseño.
Guárdate esto
La revisión de cada tarde
El único hábito que más días me ahorró. Da una vuelta por la obra cada tarde y revisa que tengas suficiente de esto para mañana — y pide a media tarde si no.
Arena y grava — por camionada; tu propio contacto, no el del albañil
Cemento — y que esté sobre tarimas, bajo techo y cubierto
Varilla — y, al colar castillos y cadenas, alambrón y alambre
Cal — para la mezcla del aplanado
Clavos — cómpralos; no pagues mano de obra por enderezar viejos
Plástico — para curar la losa, tapar el cemento y proteger del salpicado
Nada de esto lo va a llevar el albañil por ti. Te avisan cuando ya se acabó — y para entonces la obra ya se paró.
Conoce los límites
Cuándo sí conviene un profesional
Gestionar tu obra es controlar materiales, dinero y avance — no pasar por encima de quien sabe más que tú. Hay decisiones que yo no tomaría por mi cuenta.
En todo lo estructural o de seguridad vale la pena pagar asesoría, incluso en una obra apretada que llevas tú:
La cimentación — sobre todo en pendiente o terreno malo; un estudio de suelos
Las losas y la junta entre concreto nuevo y viejo (lección 2)
Las ampliaciones estructurales — consulta a un ingeniero antes de unir
El drenaje y el manejo correcto del agua
Los planos estructurales, sanitarios y eléctricos
La licencia de construcción de tu municipio
Llevar la obra yo mismo me ahorró dinero real, pero funciona porque supe dónde se acababa mi criterio. La idea no es hacerlo todo — es ser quien decide, consigue y revisa, y pagar el conocimiento justo donde el riesgo es mayor.
Preguntas
Preguntas frecuentes
¿Cómo se gestiona la construcción de tu propia casa?
No significa poner tú cada block: significa ser el responsable de pedir el material, revisar lo que se acaba, comparar precios, cuidar la calidad y mantener el avance — el trabajo que normalmente haría un maestro de obra. Te ahorra dinero, pero lo pagas con tu tiempo y atención. Si puedes estar seguido en la obra y dispuesto a aprender sobre la marcha, es muy factible; si no, te conviene un maestro de obra.
¿Conviene construir sin maestro de obra?
Es lo que yo hice, contratando albañiles directo y pagando por semana. Conviene si vives cerca, puedes estar seguido en la obra y hablas con la gente para empujar las decisiones. Lo que ahorras es real, pero te vuelves responsable de los materiales, los tiempos y de detectar los errores. Si no puedes estar presente, un maestro de obra mantiene la obra avanzando sin ti — a cambio de su costo.
¿Qué materiales debo revisar a diario en la obra?
Arena, grava, cemento, varilla y cal — y, mientras cuelan castillos y cadenas, también alambrón, alambre y clavos. Da una vuelta cada tarde y pide a media tarde lo que falte, para que tenga más chance de llegar antes del mediodía del día siguiente. El albañil no te lleva el inventario; te avisa cuando ya se acabó.
¿Cuál es el error más común al construir tu propia casa?
Quedarse sin material. Es la forma más común de perder días en una obra autogestionada, y deja parada a la gente que estás pagando. El remedio casi no cuesta: una revisión diaria y pedir con un día de anticipación. Después de eso, los errores caros más comunes son aceptar un aplanado sin definir el estándar, y no curar bien una losa recién colada bajo el sol.
¿Se puede construir una casa por etapas?
Sí — yo construí la mía en dos etapas, y muchas casas aquí se levantan poco a poco, conforme alcanza el dinero. La clave es preverlo antes de colar: pide que dejen varilla saliente de las cadenas donde se vaya a unir una losa futura. Ten en cuenta que la junta entre concreto nuevo y viejo tiende a filtrar agua, así que resuélvela bien (yo le pongo teja encima), y consulta a un ingeniero antes de amarrar cadenas nuevas a columnas existentes.
¿Autoconstrucción es lo mismo que gestionar tu propia obra?
No exactamente. Mucha gente usa “autoconstrucción” para hablar de construir tu propia casa, pero no siempre significa poner tú mismo cada block. En mi caso, yo no hice toda la mano de obra: contraté albañiles y gente con oficio. Lo que sí hice fue gestionar la obra — pedir materiales, revisar avances, comparar precios, tomar decisiones y detectar errores antes de que se volvieran caros.
Gestioné yo mismo la construcción de mi casa en San Cristóbal de las Casas, Chiapas — coordinando a los albañiles, los materiales, el sistema de agua y parte de la plomería que aprendí a hacer, viviendo en la zona y trabajando de tiempo completo. Todo esto viene de esa obra: lo que de verdad aprendí haciéndolo, para que te ahorres lo que a mí me costó tiempo y dinero.
Architect, maestro de obra or self-manage: who should run your house build in Mexico?
There are three ways to run a build here, and the real difference isn’t only cost — it’s who notices the problems, who makes the decisions, and who pays for the mistakes. I built my own house in San Cristóbal de las Casas, Chiapas: I self-managed it and worked with masons directly, I had plans drawn up by an architect, I’ve contracted maestros de obra, and I watched neighbours build with architects. So I’ll be clear throughout about what’s first-hand and what I observed.
PlaceSan Cristóbal, Chiapas
VantageSelf-managed; architect plans + maestros
The choiceWhich risk you take on
Check locallyRules & practice vary
The short version — which risk are you choosing?
Choosing who runs your build is a bit like choosing where to jump from. Every route charges you somewhere: the architect in money, the maestro in attention, doing it yourself in time and stress.
Architect-led
The springboard
The most structure and support, the least exposure. Makes most sense for a complex design, a difficult or hillside site, a tighter timeline, or if you can’t be on site often enough to catch problems yourself.
Maestro-led
The high board
A working lead builder, but more riding on the person. The middle road if you can visit the site, but not every day — and worth vetting carefully.
Self-managedMy route
The cliff dive
The most control and the most exposure. Masons paid as you go: the most savings, and the most learning — but also the most time, stress and responsibility.
Whichever route you choose, confirm who’s responsible for the structural design — not just who’s drawing the plans.
My own self-managed hillside build near San Cristóbal de las Casas, Chiapas — where the real question was not just who did the work, but who was there to notice problems before they were built in.
Terms used on this page
Arquitecto
Architect — may draw, permit, supervise or manage, depending on the agreement.
Maestro de obra
Lead builder / site foreman, usually from a mason background, who runs the crew. On site you’ll almost always hear it pronounced “maistro” — that’s the word to listen for.
Albañil
The mason doing the physical building work.
Castillo
A reinforced-concrete column; here, one with a rebar cage tied by hand on site.
Armex
Factory-made electro-welded reinforcement, lighter than a hand-tied castillo.
At a glance
The three routes, side by side
The cost figures are planning multipliers off a self-managed baseline, drawn from my own build and the same figures behind my cost estimator — not universal facts. Treat them as a starting point and adjust for your design, site and the person you hire.
Architect
Springboard
Cost
~+25%
Best for
Complex design, difficult site, limited site visits
Risk
You still need to know who owns the structure
Maestro de obra
High board
Cost
~+20%
Best for
A clear design, regular visits, a well-vetted builder
Risk
Quality depends heavily on the person
Self-manage
Cliff dive
Cost
Baseline
Best for
Living nearby, enough Spanish, controlling cost
Risk
Every mistake is yours to catch
The fuller comparison
Route
Cost
Control
Speed
Where it bites you
Best for
Architect
Springboard
~+25%
Lowest — you delegate
Can be fast
Savings can come from places you don’t see, including the structural spec; you still need to understand what’s specified
Complex or ambitious design, difficult/hillside site, tight timeline, limited site visits
Maestro de obra
High board
~+20%
Shared
Depends on how you pay
Quality rides heavily on the individual; design changes cost extra
A clear design, when you can visit but not daily, and can vet the person properly
Self-manage
Cliff dive
Baseline
Highest — it’s all yours
Often the slowest
Every detail and every mistake is yours to catch; time and stress
Living nearby, enough Spanish to push decisions, cost mattering more than convenience
“Architect-led” vs paying for plans
When I say architect-led here, I mean more than paying for drawings: a route where the architect or their team plays a real role in designing, coordinating or supervising the build. You can also hire an architect for the plans and still self-manage the work yourself — which is partly what I did. They’re different decisions, and the cost and control change with each.
These percentages are why my build cost estimator has a “who manages the work” setting — self-managing is the baseline, a maestro adds roughly a fifth, an architect-led route a little more. The money you save self-managing is real, but you pay it back in your own time and attention.
The decision aid
How I’d choose now
No single route is right for everyone — it depends on how much of your own time and attention you can put in, and how much risk you want to carry yourself. The rest of this page is the experience behind these cards.
Architect
Choose if…
The design is complex or ambitious
The site is difficult or on a slope
You cannot be on site regularly
You want permits and plans handled
You’d rather delegate than oversee
Maestro de obra
Choose if…
You want a practical lead builder
You can visit sometimes, not daily
You have a clear design already
You can vet the person properly
You want speed over hands-on control
Self-manage
Choose if…
You live near the site
You speak enough Spanish to push decisions
You can visit often
Saving money beats convenience
You’re willing to carry the stress
The hidden core
The looser the agreement, the more the risk falls back on you
Underneath the labels, the real question on every build is the same: who owns each job? The more loosely that’s agreed, the more of it lands on you by default — whether you meant to take it on or not.
Who carries each responsibility
Responsibility
Architect-led
Maestro de obra
Self-managed
Buying materials
Their team
Usually the maestro
You (and your own supplier contacts)
Coordinating workers
Architect
Maestro
You
Catching mistakes & rework
Shared — you still oversee
Maestro, but you must spot it
You
Details: lighting, plumbing routes, finish
Only if specified
Hit or miss
You
Structural decisions
Confirm an engineer owns it
Builder convention
You coordinate it — get engineering advice where needed
Schedule & delays
Architect
Depends on payment model
You
Price changes & overruns
May absorb — then economise
Often passed to you for changes
You
Read the right-hand column and you can see why self-managing is cheaper: you’re personally absorbing every row. Read across and you can see what you’re actually buying when you pay more — not just labour, but someone to own the columns you’d otherwise carry alone.
Route 01 · the springboard
Hiring an architect to build a house in Mexico
An architect gives you a professional route — but it doesn’t automatically remove structural risk, and the budget pressure can land where you’d least want it.
The appeal is obvious: pay more, hand it to a professional, get drawings and someone to run it. For a complex design, a difficult or hillside site, a tight timeline, or if you can’t be on site often, that’s often the right call. But an architect operating on competitive margins has to find savings somewhere when an unforeseen cost appears — and savings can come from places you don’t see, including the structural spec.
What happened on my own plans — the armex story
When my architect drew up the plans, she suggested one way to bring the budget down: use armex — a thin, factory-made electro-welded reinforcement — in some intermediate columns, instead of having the builders tie rebar cages, or castillos, by hand on site.
I was told this was a recognised and reliable method, and at the time I did not really understand the difference. In the end, I used armex only in the intermediate columns of one external wall. What gave me second thoughts later was not whether armex is allowed, but how thin it looked and felt next to a hand-tied castillo.
I am not saying armex is unsafe, or that every architect specifies it. But in an earthquake zone, knowing what I know now, I would ask very direct questions about what is going into the columns and beams. The structural spec is one of the few parts of the build you cannot easily revisit later.
And a plan is not supervision. A drawing on paper doesn’t build itself or check itself. Someone still has to confirm that what’s going up matches the drawing — and that the details the drawing doesn’t show have been thought through at all. That gap between “designed” and “supervised” is exactly where the next two routes live.
An architect is not always a structural engineer
It’s easy to assume “architect” means “the person responsible for the structure.” Often it doesn’t. Depending on the project and location, an architect may design, draw, permit, supervise or coordinate — while the structural calculations and structural responsibility sit with a separate engineer, or with builder convention.
For anything structural — foundations, slabs, beams, columns, retaining walls, hillside builds, extensions — ask plainly: who is responsible for the structural design, and has an engineer reviewed it?
What my plans cost — and why I’d spend it again
My plans cost me MX$28,000 in 2018 (it’s in the paperwork lines of my cost breakdown and my budget checklist), when other architects were quoting MX$20,000–25,000. What pushed mine up was three design meetings, with the plans updated after each, and a quote to build it that priced the material quantities. A simple plan from a single consultation costs a lot less. Many architects will also draw the plans for free if you hire them to build: I was offered that, and it’s a common incentive to keep you on for the whole job.
I’d still pay for the extra rounds. Mix your own ideas — a pinch of Pinterest — with the architect’s expertise, and let the plans change a few times. I also learned later that the plans needn’t be the last word: if you self-manage, or work with a maestro de obra you talk to closely, you can keep modifying the design as you go, as long as you think through what each change means for the structure and the budget. You learn some of that along the way, and a good maestro should give you excellent advice when you make a change. Anything structural still needs a qualified check — see permits, plans and structural responsibility.
Best for: a complex or ambitious design, a difficult or sloped site, a tight timeline, handling permits and plans, or anyone who can’t be on site often enough to catch problems themselves.
Route 02 · the high board
Working with a maestro de obra in Mexico
A maestro de obra is the natural middle option — and the one where the result rides most heavily on the individual.
Many masons who have the temperament to lead others, and to step back from doing the work themselves, become maestros de obra: they run the day-to-day site and coordinate the crew without you employing an architect. In my experience they’ll make you feel like you’ve chosen exactly the right person — and then, once work starts, the attention to detail and the quality of their workers can be hit or miss. They bring their own masons and skilled people at the right moments, which is the real value, but you still have to keep an eye on the work and nip problems in the bud.
How you pay changes their behaviour. Pay by the week and things advance slowly. Negotiate a price for the whole job and they’ll put more masons on it, often working longer hours with fewer breaks to finish. And if you ask them to change the design, or fix something that wasn’t as you’d discussed, expect to pay extra — it wasn’t in the deal.
Vet the person, not the phone
Don’t choose on the strength of nice photos on a phone. Ask to visit the actual houses, and get a reference from a previous client you can reach. Even that isn’t a guarantee — I once contracted a maestro with stunning photos and a good reference, and he still didn’t work out — but it filters out a lot.
Red flags when hiring a maestro de obra
Asks for a large advance to start
Can’t show recent work, or only photos — no houses you can actually visit
Previous clients are vague or hard to contact
The quote doesn’t say what’s included
Refuses a weekly / pay-as-you-go structure
Gets evasive when you ask about materials or methods
A good sign, by contrast: a maestro who offers options and ideas and is clearly thinking about the details of your project — not one who just answers “no hay problema” to everything.
Pay as you go
There’s no need to hand over more than about a month’s worth of the agreed price at a time. A small advance to start the work is normal practice — keep it to a small percentage of the total, not a big lump up front.
Best for: a clear design, when you can visit the site regularly but not daily, and when you can vet the person properly.
Route 03 · the cliff dive
Building without an architect: self-managing with masons
Self-managing saves the most and gives the most control — and hands you every detail nobody else will plan.
You draw up plans, with an architect or on the back of a napkin, and then run the project yourself. The saving is real, but so is the load: if you’re short on time or unwilling to learn as you go, expect more grey hair than you started with. The crucial thing to understand is that nobody plans the details but you. Don’t expect anything beyond the bare shell to be thought through — masons address plumbing and lighting after the main structure, and routinely miss planning for the best result.
On my own build, the masons left me with a single main wiring route up the second floor instead of two. There were no design considerations for kitchen lighting sitting the right distance off the wall, or for plumbing following basic best practice — the kind of misses that later show up as bad smells, or as everyone over four feet tall casting a shadow straight across the kitchen counter while they cook. One of my favourite memories, now that I can laugh at it, was the argument to move a half-built wall a few inches so the back of the toilet would actually align with the bathroom plumbing. Don’t expect masons to follow architectural plans unless you’ve gone over every detail with them — and then reminded them.
The cross-cutting decision
Pay weekly, or for the whole job?
This sits underneath the maestro and self-manage routes, and it’s a management decision as much as a cost one. Neither is simply cheaper — they suit different amounts of your own time and attention.
Weekly / day rate
Whole-job fixed price
Speed
Slower — a couple of years isn’t unusual
Faster — built in months if scope is clear
Flexibility
High — change the design as you go, “let’s add a window here”
Low — changes cost extra and break the price
Quality control
Easy to halt the work before it’s too late
Builder may rush or hide compromises if the margin gets tight
Learning
A year of conversations and you’ll understand the whole build
Less hands-on involvement
Bringing your own trades
Builders paid by the day will wait for your plumber/electrician
Builders paid for the job won’t wait around for anyone
The risk
Drifts if you’re not actively managing it
Incentive to finish — and to economise where you can’t see
The honest trade-off: paying weekly buys flexibility, learning and control but rewards slow progress; a fixed whole-job price buys speed but won’t pause for the electrician or plumber you bring in yourself. I go into the numbers behind both in the cost to build a house in Mexico breakdown.
Why oversight matters
Some mistakes become invisible — someone has to catch them in time
Whichever route you choose, this is the work you’re really paying for (or taking on): being there at the moments a mistake gets sealed in and can’t be fixed without tearing something out.
Rebar — before the concrete is poured
Plumbing runs and slope — before render and floors go on
Electrical routes — before the walls are rendered
Slope & drainage — before the floors are finished
Roof joins — before waterproofing
If you self-manage, these are your inspection moments. If you hire a maestro or an architect, this is exactly the oversight you’re paying them to own — so make sure someone genuinely does. The detail of how to check them is in the self-manage guide.
The honest part
The stress nobody quotes you
Ask anyone who’s been through it and most will tell you building was taxing. Living five miles from my site and working full time while managing it, I put over 6,000 miles on my bicycle in the first year alone. The stress has two real sources.
The accountability gap. Everyone does their part, but nobody owns the whole house unless you pay someone to own it — or you own it yourself. When the standard falls short and you don’t have the knowledge or the time to spot it and fix it, that gap is where the stress lives.
Imported expectations. Many “simple” expectations are really tacit agreements that hold in Europe or the US and may not here. If the lighting and the plumbing routes were never explicitly discussed — because you assumed the mason would raise them — those conversations simply don’t happen, and the misses follow.
The mason-changeover ritual
If you change masons during the build — and I did, many times — be ready for it: every new mason has a moment where he looks at the previous one’s work and disapproves of it. Some of that is real and worth hearing; some of it is theatre. As the owner, part of the job is learning which is which.
One practical note that saves money and stress: if you’re not paying someone to manage the job, suspend work when the rainy season pushes persistent rain across the country. Workers will happily turn up and spend half the day sheltering — pleasant for them, expensive for you, and concrete still has to be mixed outside.
Don’t misread this page
Permits, plans and structural responsibility
Choosing to self-manage, or to hire a maestro instead of an architect, is a decision about who manages the work day to day. It is not a recommendation to skip professional involvement where it’s required. Even self-managing, you may still need plans, permits, signatures or an engineer’s input depending on your municipio, your land status and the type of work — and structural and legal decisions should always be confirmed with someone qualified for your own site.
Questions
Common questions
Do I need an architect to build a house in Mexico?
No — most homes in Chiapas are built without one, either with a maestro de obra or by self-managing with masons directly. An architect makes most sense for a complex design, a difficult site, a tight timeline, or if you can’t be on site regularly. One caution: an architect isn’t automatically the person responsible for the structural design — ask who is.
What is a maestro de obra?
An experienced lead builder — usually a mason who’s stepped back from the physical work to run the day-to-day site and coordinate the crew, for a fee. It’s the middle route between hiring an architect and self-managing, and the quality depends heavily on the individual, so vetting matters.
Is a maestro de obra cheaper than an architect?
Usually. As a rough planning guide off my self-managed baseline, a maestro adds around 20% and an architect-led route around 25% — not fixed rules, and they move with the person, design and site. Self-managing is the cheapest because you absorb the management yourself, in time and attention.
Can I build a house in Mexico without an architect?
Yes — many people do. What you can’t safely skip is the structural and legal side: depending on your municipality and land status you may still need plans, permits or an engineer’s involvement. “No architect” is a choice about who runs the build, not a licence to skip what’s legally or structurally required.
Is it cheaper to pay builders weekly or for the whole job?
Weekly pay gives flexibility and time to learn, but rewards slow progress — a build can stretch to a couple of years. A fixed whole-job price is faster, but builders won’t wait for trades you bring in, and a tight margin can tempt them to economise where you can’t see. Neither is simply cheaper.
What’s the safest structural choice in an earthquake zone?
I’m not an engineer, so treat this as a homeowner’s experience, not advice. What I’d do now is ask direct questions about what’s going into the columns and beams — hand-tied castillos versus thinner factory-made armex, for example — and confirm a qualified engineer owns the structural design, especially on a slope or for an extension. A cheaper structural spec is one of the few things you can’t easily change later.
I built and managed my own house in San Cristóbal de las Casas, Chiapas — self-managing it with masons directly, after having plans drawn up by an architect and contracting maestros de obra along the way. This is what I learned about who should run a build, from self-managing, building from an architect’s plans, and working with maestros myself.
Managing your own house build in Mexico: 10 things I wish I’d known
I managed the construction of my own house in San Cristóbal de las Casas, Chiapas — finding materials, coordinating masons, catching mistakes and making decisions, while working full time. This isn’t a generic construction guide. It’s the practical site knowledge I only picked up because I was the person who had to order the sand, check the cement, question the finish, and keep the job moving.
The house partway through the build, 2019 — ground floor standing, first-storey blockwork rising, and the site staircase the masons knocked together from formwork timber. Every block, bag of cement and truckload of sand in this photo was something I ordered, checked and counted.
The short version
Managing your own build can save real money — but the saving isn’t free. You pay for it with attention. You become the person responsible for materials, timing, quality checks and daily decisions — the jobs a contractor or maestro de obra would otherwise carry for you. Self-managing doesn’t mean doing all the labour yourself. It means being close enough to the work to stop small problems becoming expensive ones. These are the ten lessons that cost me time and money to learn.
First, the basics
What does managing your own build actually mean?
When I say I managed my own build, I don’t mean I laid every block or poured every losa myself. I hired masons and paid skilled workers for the things they knew how to do. The difference was that I didn’t hand the whole project to an architect, contractor or maestro de obra and wait for a finished house.
I was the person ordering materials, checking what had run out, comparing prices, asking why something was being done a certain way, and deciding what could wait until later. That gave me more control over the budget — but it also meant the delays and mistakes were mine to catch.
This article is about that middle ground: not doing everything yourself, but not disappearing from the build either.
At a glance
The ten lessons, and why each one matters
Each lesson is a thing I got wrong, learned late, or only understood after I’d already paid for it. The deeper technical and cost detail lives on the linked pages.
The ten lessons, at a glance
Lesson
Why it matters to you as the manager
Go deeper
1. Own your materials supply
Builders’ prices for sand, gravel and cement can run 15% higher than your own contact — on the biggest-volume materials in the build.
Own your materials supply — and count it every afternoon
On my build, the supplier contact alone moved the price by around 15% on some of the highest-volume materials.
Sand and gravel are bought by the camionada — the truckload. My first assigned builder asked whether I’d handle ordering them. I had no idea who to call, so we agreed he would. Two things became clear later. When I switched builders, I found the price for these materials could move by around 15% depending on whose contact you used — a substantial amount on some of the highest-volume materials in the whole build. And having my own supplier the second time around was quietly empowering: it shows a builder you know what you’re doing, which sets the right boss-and-contractor tone from day one. I’ve since had builders ask me for my contact when I tell them the price I pay.
Smaller, non-chain ferreterías sometimes grow into sizeable local cement distributors, and in my experience they’re cheaper than the big chains — though they often take longer to deliver. Buy cement by the ton, and rebar in volume, and you save on both. My house-building budget checklist lists every material and labour line I planned for.
The other half of this lesson is the one I’d repeat loudest: check your sand, gravel and cement on site at the end of every day. If you’re managing the build, the masons won’t be tracking stock for you — they’ll tell you they’ve run out only once they have, with the work already stopped and people standing around. Order at least a day ahead; order in the early afternoon for the best chance of delivery before midday the next day. When the columns and beams are going up, the same applies to alambrón, alambre and nails.
Why this is lesson one
Running out of material is the most common way a self-managed build loses days — and idle workers you’re paying by the week. The fix costs nothing but a five-minute walk-round each afternoon and one phone call.
Plan future extensions before the concrete is poured
The cheapest time to plan an extension is before the first roof is even poured — and it’s free.
I built my house in two stages, so I’ve had to add onto existing concrete. Two things are worth knowing before you’re in that position. First, if you tie a new horizontal reinforced-concrete beam into an existing column, it’s a weak connection. Some masons refuse to do it; others do it without a second thought. Don’t take either at face value — ask a structural engineer.
Second, if you already know you’ll extend a concrete roof later, ask the masons to leave a good length of rebar protruding from the reinforced beam, perpendicular and ready, so the new roof can be structurally joined. It costs nothing now and is almost impossible to replicate later.
The caveat I learned the hard way
In my experience, joining a new concrete slab roof to an existing one tends to let water and humidity filter through the join, however carefully it’s done. I’m running tiles over the full length of where my two roofs meet to keep the damp out of the house. Plan for the join to be a weak point, and detail it accordingly.
If you’re weighing a concrete roof against the alternative for exactly these reasons, I wrote up the full comparison separately.
Lesson 03
Pin down the rendering standard before you accept the quote
“Rendered” can mean two very different walls — and the cheaper one isn’t straight.
I had two clearly different standards of rendering on my house from different builders. In the first, the render is brought plumb and a builder’s line is used meticulously, so the finished wall is genuinely straight and level across its whole length. In the second, no consistent flat surface is achieved across the wall. The second is faster, easier and uses less material — especially where the wall isn’t plumb, because the builder isn’t compensating with extra cement. Both get called “rendering.” Always ask which one you’re quoting, or which one you’re getting — it has a big effect on labour and on how the finished house looks.
There’s a second conversation to force, and it’s about adhesion. Render doesn’t stick well to smooth concrete, and columns and beams are usually smooth. In Guatemala, masons routinely chisel small indents into those surfaces so the render grips. In Chiapas, in my experience, this gets skipped or done half-heartedly. Make it an explicit talking point: “How are you making sure the render doesn’t fall off in a year or two?”
Lesson 04
Don’t let recycled nails slow the job down
Recycling is good — except for nails on an active site.
I’m all for recycling, and I’d never argue against it generally. But every mason I’ve hired will stop and hammer old nails out of scrap wood and straighten them for the next stage rather than ask for new ones. That’s labour I’m paying for, to save the cost of nails that are cheap to begin with. Buy the nails. The old ones can still be recycled after the project — when they’re not holding up your build.
Lesson 05
Store cement properly in the rainy season
Bulk cement is a saving — until the damp gets into it.
If you’ve bought cement in bulk to save money, protect it, especially in the rainy season. Keep it off the ground, keep it under a roof, and wrap it in plastic — particularly if it might be a couple of weeks before you use it all. Damp cement is money you’ve already poured away. (This is one of several reasons to have plastic sheeting on site before you need it — see lesson 7.)
Lesson 06
Hand-poured slab vs mixer-and-crane: why I switched
Most roofs in Chiapas are poured by hand — the slab, or losa as it’s called on site. I had my intermediate floor poured by workers carrying buckets. When I added rooms onto the back of the house later, I paid for a concrete mixer truck with a pump on an extendable crane instead. Here’s why.
I expected price to be the deciding factor — it wasn’t. I costed both options and they came within 6% of each other (and even that’s fuzzy, because a manual pour can leave you with leftover concrete mix). On cost, call it a wash. The real differences were everywhere else:
Hand-poured slab vs mixer & crane
Factor
Winner
What I saw
Speed
Mixer & crane
About 45 minutes, versus roughly 3 hours by hand (depends on roof size).
Mess & labour
Mixer & crane
A hand pour means 15–20 labourers tramping round the wet site — whom you then feed — and a clean-up the next day.
Platform strength
Hand pour
The crane drops cement from a height, so your timber shuttering has to be built stronger for it.
Mix confidence
Mixer & crane
By hand, with many people mixing, proportions vary and mud gets walked into the mix in the wet season. I trusted the mixer more.
An honest disclaimer
Which of my slabs cracked? The one poured by the mixer. But I doubt the mix was to blame — far more likely a movement in the supporting structure and the intense sun straight after the pour (see lesson 7). I still chose the mixer the second time, and would again.
Lesson 07
Have plastic sheets ready before you pour
A slab cures by staying wet. In direct sun, it can’t — unless you’ve planned for it.
If you pour a losa — the concrete slab, and you may end up doing parts of it yourself — cover it, especially if the roof or floor sits in direct sun all day. One thing they do in Guatemala that I’ve not seen in Mexico is build a temporary cement lip around the roof edge at the pour, to pond water on top and keep the slab humid while it cures. My roof was fully exposed, and despite trying to keep it wet, that’s nearly impossible without something to trap the water. A plastic sheet both shades the slab from the worst of the sun and helps hold the moisture in. I wish I’d done it.
When you’re not curing a slab, those same sheets earn their keep: strapping over your stored cement bags (lesson 5), and protecting anything you don’t want cement on — brick, stonework, finished pavers — while rendering.
Lesson 08
Learn one simple skill: the thermofusor
For about MX$400, you can do your own plumbing joins. There’s no lower-barrier building skill.
You can buy a Chinese thermofusor on Amazon — like I did — for around MX$400, and it works perfectly. There is no cheaper, lower-training-barrier house-building and maintenance skill than fusing together ½” water pipe. YouTube covers the few basic steps, you can practise for almost nothing, and at a minimum it lets you finish off the bathroom and kitchen connections yourself when you’re fitting the sinks and toilets.
Lesson 09
Render the exterior as part of the build, not years later
Rendering is a filthy job. Do it before there’s anything finished to ruin.
I had the outside of my house rendered two years after the build was otherwise done, because I didn’t have the budget for it at the time. I don’t regret waiting — but it’s not a good experience. Render is messy work, with wet cement flying everywhere; even the cat keeps away while the builders are at it. Doing it late meant cleaning cement off finished doors and windows, and fretting over footprints and splatter on the new garden-path pavers. If you can possibly afford to render the exterior while the build is still rough, do — your doors, windows, paths and driveway will all thank you for it.
Lesson 10
Choose wall materials for how they live, not just what they cost
Wall materials are not just a price decision. On my build, I used different materials in different parts of the same house — brick, hollow cement block, tabicón and a lightweight pómez thermal block — and they did not feel the same once I was living with them.
The biggest lesson was that a wall’s sun exposure matters as much as the unit price. A material that makes sense on a sunny wall may not be the right choice for a shaded bedroom wall that stays cold all winter. I wish I had planned the wall materials room by room before the build reached that stage.
The single habit that prevented the most lost days. Walk the site each afternoon and check you have enough of these for tomorrow — and order by early afternoon if you don’t.
Sand & gravel — by the truckload; your own contact, not the builder’s
Cement — and that it’s stored off the ground, under cover, wrapped
Rebar — and, while pouring columns/beams, alambrón and alambre
Lime — for render mixes
Nails — buy them; don’t pay labour to straighten old ones
Plastic sheeting — for curing a fresh pour, covering cement, masking off finishes
The masons won’t track any of this for you. They’ll flag a shortage only once they’ve run out — by which point the work has already stopped.
Know the limits
When I’d still bring in a professional
Self-managing is about controlling materials, money and momentum — not about overruling people who know more than you. There are decisions I wouldn’t make on my own judgement.
Anything structural or safety-critical is worth paying for advice on, even on a tight, self-managed build:
Foundations and footings — especially on a slope or poor ground
Roof and floor slabs, and any join between old and new concrete (lesson 2)
Structural extensions — get a structural engineer’s view before tying in
Drainage — getting water away from the building correctly
Legal and land status — deeds, ejido land and the SRE process for foreigners
Managing the build yourself saved me real money, but it works because I knew where my judgement ran out. The point isn’t to do everything — it’s to be the person who decides, sources and checks, and to buy in expertise exactly where the risk is highest.
Questions
Common questions
Is it cheaper to manage your own house build in Mexico?
Yes — in my case, self-managing came out well below the MX$8,000–22,000/m² that many construction firms quote, because you’re not paying for their management and margin. But the saving isn’t free: it’s paid for with your time and attention. You become responsible for sourcing materials, checking quantities daily, deciding the finish standard and keeping people working. If you can’t be on site regularly, much of the saving disappears.
Should I hire a maestro de obra or manage the build myself?
A maestro de obra is an experienced lead builder who runs the day-to-day site and coordinates the masons for a fee — less than an architect, more than going it alone. Managing it yourself saves that fee but means you own the materials, timing and quality control. It comes down to how much of your own time you can give the site. If you can be there most days, self-managing is realistic; if you can’t, a maestro keeps the job moving without you.
What materials do I need to check on site every day?
Sand, gravel, cement, rebar and lime — and while you’re pouring reinforced columns and beams, also alambrón, alambre and nails. Walk the site each afternoon and order anything short by early afternoon, so it has the best chance of arriving before midday the next day. The masons won’t monitor stock for you; they’ll tell you once they’ve already run out.
What’s the biggest mistake when managing your own build?
Running out of materials. It’s the most common way a self-managed build loses days, and it leaves workers you’re paying standing idle. The fix is almost free — a daily stock check and ordering a day ahead. After that, the costliest avoidable mistakes are accepting a vague rendering standard, and not curing a fresh concrete slab properly in the sun.
Can I build a house in stages and extend it later in Mexico?
Yes — I built mine in two stages, and many homes here are built room by room as money allows. The key is to plan for it before the concrete goes in: ask the masons to leave rebar protruding from the beams where a future roof will join. Be aware that a join between old and new concrete tends to let water through, so detail it carefully (I run tiles over mine), and get a structural engineer’s view before tying new beams into existing columns.
I managed the construction of my own house in San Cristóbal de las Casas, Chiapas — coordinating the masons, the materials, the water system and the finishing work myself, while living locally and working full time. These are the lessons I actually learned doing it, shared so you can skip the ones that cost me time and money.
Water system and plumbing for a house in Mexico: what I wish I’d understood
Before I built, I rented in Chiapas. In one small house the kitchen sink clogged so badly that part of a block wall had to be broken open to clear the fat a metre down the pipe. I didn’t want that in my own house, or a bathroom you need to leave in a hurry. But I started out thinking plumbing wasn’t worth my time to understand, and that water was something to sort out once the walls were up. That was the mistake.
PlaceSan Cristóbal, Chiapas
BuildSelf-managed
SystemCistern + gravity feed
House system≈ MX$77,500
✓ Paid — what I actually paid~ Estimated — worth checking locally
If there’s one thing to know first, it’s that plumbing is much simpler than it looks once you break it down. This page is what I learned plumbing my own house in San Cristóbal de las Casas: enough to make better decisions and have useful conversations with your builders. The plumber knows the technique. You’re the one who has to live with the layout.
Cistern → pump → two roof tanks → gravity → kitchen, 2 bathrooms, 3 gas boilers
Have the drain fittings, pipe sizes and fall checked before the floor is poured.
Plan a way in for clearing blockages, so maintenance doesn’t mean breaking a wall.
Choose the shower drains early, and ask how traps and vents will keep smells out.
Pour the cistern bigger than you think you need. It’s the one part you can’t easily enlarge.
deep well not included
Tanks on the roof
What the tanks on Mexican roofs are for
They store water. The plastic cylinders on so many Mexican roofs are tinacos, filled from below by the street supply or by a pump, and gravity then gives the taps their pressure.
Most of the houses I rented in Chiapas had no cistern, just tanks on the roof. In the dry season the water was rationed: the supply came twice a week, sometimes less often, and the tanks had to last until it came again. In my experience of Chiapas, that scarcity, with no cistern to pump from, is the main reason you see several tanks on one roof.
A cistern is a different thing: a tank usually below ground, often concrete, that holds far more and needs a pump to lift the water up to the roof. My house has both. Rain fills the cistern, a pump fills two tinacos, and gravity does the rest. Tinacos don’t catch rain themselves, because the opening is too small, though where water is scarce you’ll sometimes see guttering run into one.
Blocked toilets
Why toilets keep blocking
Three installation choices mattered in my build, all settled before the floor is poured: the bend under the toilet, the size of the pipe, and the fall.
The bend. A tight 90° elbow gives waste a corner to catch on. A gentler 45° needs more depth under the floor, and if nobody planned the floor height, it doesn’t fit. The construction standards UNAM uses for its own buildings say the same: 45° connections on drains, with a right angle allowed only where a pipe turns from horizontal to vertical.
I have one toilet with a 90° bend, forced on me by exactly that lack of depth. In the other bathrooms I fitted a 45°, in one by raising the floor to make room, and the difference is notable: the 90° toilet is the only one in the house that blocks, now and then.
The pipe size. Four-inch is the norm here for a toilet drain, and the wider pipe is less likely to block. Builders reach for 3-inch when the walls are already up and there’s nowhere to hide the bigger pipe.
I was offered 3-inch in one bathroom that was built, before I understood any of this, with no plumbing in the walls. I said no and ran that bathroom’s pipes outside the house instead, as I have with as many water pipes as I could. It isn’t pretty, but the confidence that it works is worth the small loss in looks, and I can reach those pipes without breaking a wall or a floor.
The fall. A drain needs a steady slope so the solids travel with the water. I worked to at least 2%: two centimetres of drop for every metre of pipe. That meets or beats every minimum I’ve found; the same UNAM standards ask for 2% on drains up to 75 mm and 1.5% on larger ones, and never a level run.
I’ve never met a builder here who measured the fall. I once watched the masons on the next plot lay a rainwater drainpipe, then watched the water sit in it during the next downpour. One of my own toilet runs was under 2%, and I steepened it before the floor went down.
Changing any of these once they’re buried usually means breaking the floor. Clearing a blockage doesn’t, as long as there’s a way in: an access point (registro) on the line, or a pipe you can reach, like my outside runs.
If you’re renting or staying somewhere: a toilet that blocks again and again, rather than once, is worth having checked, because the cause may be in the pipe and not just in what went down it. Tell the owner which toilet, how often, and whether other drains slow down at the same time.
From my build · waste runs before the slab
My waste runs while they were still uncovered. The zigzag looks complicated, but every joint is either a 45 or a 90, and the whole thing is a hacksaw and glue. This is the stage to check the fall, because the floor goes down on top of all of it.
Bathroom smells
Why bathrooms smell of drains
A drain smell means gas from the waste pipe is getting into the room, usually past a trap, sometimes through a failed seal or a leak. A trap is a bend in the drain that holds a little water to block the gas coming back up; when it’s missing, dry or not doing its job, the smell gets through.
Diagram · how a trap and vent work
The water sitting in the bend stops drain gas coming back into the room. The vent lets air into the waste line, so that water isn’t sucked out or pushed through, and lets the gas out above the house.
In one house I rented, a pungent sulphur smell hung around the bathroom. I knew the landlady would put it down to a sensitive nose rather than pay for anything, and I had no way to point to a cause. Since then I’ve reworked what builders installed in one of my bathrooms and vented my own drains, and these are the causes I’d look for.
No vents. Venting is standard plumbing practice, set out in the US plumbing code’s chapter on vents, but in my experience builders in Chiapas don’t usually vent the main waste lines. There’s no special material, just ordinary drain pipe, but where a vent joins the waste line and where it ends both matter, so have your plumber place them.
I added three vent pipes through the roof and one through a wall, all before the floor went down. My wastewater goes to the three-stage treatment system under my garden, which is why I was adamant about venting, and I’m convinced the bathrooms would smell without it. Even so, there’s the odd day with some smell. Most days there’s none.
Shower drains with no seal. The toilet, sink and shower share the same waste line, so a smell can come up through any of them. For the showers I bought anti-odour drains, coladeras antiolores, with a flap underneath that opens to let water through and closes against smells. Give them to the builders before they pour the floor. They’re on Amazon, and they were one of the cheapest, best-value buys of the build.
A failed seal under the toilet. The ring that seals the toilet to the drain can fail, and then the smell comes from the base. Fitting one is simpler than it sounds (below). A pipe that holds waste, through a poor fall or a tight bend, can smell for the same reasons it blocks.
If you’re renting or staying somewhere: a drain that smells after the place has stood empty may just have a dry trap, where the water in the bend has evaporated. Run water into it for a minute. If the smell stays, tell the owner which drain it is and whether it gurgles when another fixture is used. That helps whoever looks at it, because gurgling can point to the venting.
Before the floor
Before the walls and floor close: what to ask
Most of the above is decided while the pipes are still visible, and if you don’t drive that conversation, it often doesn’t happen. These are the questions I’d ask the plumber or the maestro:
Where does each fixture go, and does each toilet line up with its wall and its drain?
What fitting is under each toilet, what size is the pipe, and what’s the fall?
How will the traps and vents keep smells out, and are the shower drains on site yet?
Where can I get at each line to clear a blockage without breaking anything?
Then photograph everything before the render and the floor go on. One of my better-remembered arguments on the whole build was over moving a half-built wall a few inches: as it stood, the back of the toilet wouldn’t line up with the wall and its plumbing. We moved it. Precious memories.
How much of this you chase yourself depends on how you run the build, whether with an architect or a maestro de obra or by managing it yourself. Either way, walk the water and waste routes before they’re hidden.
From my build · bathroom pipework
One of my bathrooms with the wall still open. The green pipe is TuboPlus, the cream is CPVC, and the white trap at the bottom is the waste line. At this stage everything can still be moved. Once the render goes on, it can’t.
First-hand · a small thing that looked harder than it was
Fitting a toilet
I’d always assumed a toilet involved some elaborate installation. It doesn’t. I bought mine with no plumber on site, read the manual, and found the basic job is two holes drilled in the floor and a flange that seals the pan to the drain. Flanges run from about MX$40 to MX$600; the cheap wax one gives a good airtight seal if your floor is level, and I never saw a reason to buy the pricier plastic kind. A bead of silicone around the base finishes it. I used Sika sealant, easy to find on Amazon Mexico.
Well or rain
If your land has no water — well, rainwater, or both
My land came with no water connection at all. That’s common on the rustic plots foreigners are drawn to, and it’s one reason “cheap” land can be less cheap than it looks. For my plot, the options were catching rain or getting water out of the ground, with a water truck (pipa) as the stopgap.
My water table sits about 18 metres down, too deep for a hand-dug well, so the option was a drilled well (pozo profundo). In 2024 a local company quoted me about MX$80,000 to drill it, fit the pump and connect it to the house. Groundwater is regulated federally through CONAGUA, so check what permission you need, with them or a lawyer, before anyone drills.
Rain was my answer. Water off the lámina (tin) roof is much cleaner than runoff from the concrete roof, so the tin roof feeds the cistern that supplies the house, and the concrete roof fills separate tanks for washing clothes. That’s one reason the roof decision and the water decision go together. We haven’t needed a pipa in either dry season so far. The full catchment build is in my off-grid water guide.
The cistern
The cistern: the one part you can’t easily enlarge
Mine is a concrete-lined cisterna of about 10,000 litres. It cost MX$30,000, roughly MX$20,000 of labour and MX$10,000 of materials, and it has carried a family of four, using roughly 1,000–2,000 litres a week, through the dry seasons, though without much to spare. If I were pouring it again I’d go to 12,000–15,000 litres. Once it’s set, enlarging it means breaking concrete.
In 2025 I added a second 1,100-litre tank on the roof, filled from the cistern. It helps, but it’s a top-up, not a bigger cistern. Where that water goes, and how I’d size a cistern against the dry season, is in the off-grid guide’s water-use section.
Pump & hot water
Roof tanks (tinacos): pump up, then gravity down
Plumbing is hard to picture mostly because you never see it: the pipes are hidden in walls and floors. Mine is simpler than most, because the water only has to climb once.
A pump lifts water from the cistern to two 1,100-litre Rotoplas tanks on the roof, and from there it falls by gravity to the kitchen, both bathrooms and the boilers. No pressure pump runs every time you open a tap. The pump cost about MX$3,000; size yours to the height the water has to climb, not to the cheapest box on the shelf. The Rotoplas tank comes with an inline filter that gives the water a pass on the way up, but it isn’t a drinking-water filter.
I filter at the point of use instead of fitting a whole-house filter: shower filters, and a kitchen filter for drinking water. The full chain is in the off-grid guide’s filtering section.
For two years we switched the pump on and off by hand, climbing up to see how much was left in the tank. Since 2026 an electronic float switch does it for us, the change I describe in my story about living on rainwater.
Hot water: three gas boilers
We have three gas boilers, all fitted by the end of 2024. Two are economy de paso (on-demand) units, at MX$1,400 each, for the kitchen and the second bathroom. The main bathroom has a MX$6,000 hybrid, part storage and part de paso, with the capacity to serve another bathroom.
Hot and cold routing looks complicated on a plumber’s diagram, and those diagrams still confuse me. I’ve installed boilers and bathrooms myself anyway, by taking it one small section at a time. One cold pipe runs from the roof tank to the boiler, and the same cold line carries on past it to the bathroom. One hot pipe runs from the boiler to the bathroom. Inside the bathroom, the toilet takes only cold, while the shower and the sink take both: three places for the cold line to reach, two for the hot.
CPVC vs TuboPlus
CPVC vs TuboPlus: where each one made sense in my house
My verdict first: TuboPlus for anything exposed, above all on the roof, where its UV resistance settles it. Inside the walls either material works, and that choice is yours.
CPVC is cut with a saw and joined with a yellow glue: cheap, easy to work with, and easy to cut out and re-glue in a tight wall chase. TuboPlus is a plastic pipe whose joints are heat-fused (termofusión). It’s tougher, flexible and resistant to movement and sunlight, but it costs roughly three to four times as much for the same runs, and the fusion tool is bulky in tight spaces. I spoke to three plumbers during the build. One who installs TuboPlus will often want the whole system in it rather than mixing materials, which is a reasonable preference, as long as you know it’s a choice.
CPVC vs TuboPlus — where each earns its place
CPVC
TuboPlus
How it joins
Cut and glue
Heat-fused
Strengths
Cheap, simple, easy to repair
Tough, flexible, UV-resistant
Weaknesses
Less robust; relies on the glue joint
Dearer; needs a fusion tool; awkward in tight spots
Where I’d use it
Inside walls and floors, if you want cheap and easy to repair
Roof and exposed runs, or everywhere if your plumber prefers
Fusing it myself
Fusing TuboPlus was the one job I assumed I’d never attempt. Shortly after we moved in, I needed the last connection made on the kitchen sink. The plumber, who was also a friend, didn’t have time, so he lent me his termofusor instead. It didn’t seem like a good solution, but I watched a YouTube video, had a go, and it worked. That one joint is why I bought my own: a Chinese one costs about MX$400 on Amazon, mine works well, and I’ve since used it to install a bathroom.
A plumber charges around MX$4,000 a bathroom, more with roof connections, so doing some of it yourself can save about MX$10,000. Not everyone should pick up the tool, but once you’ve made a joint yourself, you understand what you’re asking your plumber for.
Costs
Water system and plumbing costs from my house build in Mexico
What the system inside the house cost up to the end of 2024, for a two-bedroom, two-bathroom house in Chiapas: mostly what I paid, with the pump estimated. Plumbers bundle labour and materials differently and prices move, so check the lines against local quotes rather than treating them as one.
Cost breakdown — the house water system, to the end of 2024
Item
Cost
Cistern, ~10,000 L concrete-lined
MX$30,000
✓
PumpSized to the lift from the cistern to the roof
~MX$3,000
~
Pump → roof tankMaterials & labour
MX$10,000
✓
Roof tank → kitchen, 2 baths & boilersMaterials & labour (TuboPlus)
Boilers — 3, gas2 × MX$1,400 de paso + one MX$6,000 hybrid
MX$8,800
✓
Boiler connections + 2 shower valves
MX$2,089
✓
Water & plumbing system
≈ MX$77,500
Added since — not in the total
Second rooftop tank, 1,100 L2025
not priced
Electronic float switch on the pump2026
not priced
Not included: getting water onto the land in the first place. If you need a deep well, my 2024 quote of about MX$80,000 sits on top of all this.
FAQ
Common questions
How much does a water system cost for a house in Mexico?
On my self-managed build in Chiapas, the water system inside the house came to about MX$77,500 up to the end of 2024: cistern, pump, roof tank, plumbing, three gas boilers, wastewater pipework and fittings, mostly at what I paid. That excludes getting water onto the land; if you need a deep well, budget for it separately.
How much does a deep well (pozo profundo) cost in Mexico?
In 2024 I was quoted about MX$80,000 to drill to around 25 metres, fit the pump and connect it to the house, with an added cost per metre if they had to go deeper. Groundwater is regulated federally through CONAGUA, so check whether you need a permit before drilling.
What size cistern do you need for a house in Mexico?
Mine holds about 10,000 litres for a family of four and cost MX$30,000. It works, but I’d pour 12,000–15,000 litres next time, because the cistern is the one part you can’t easily enlarge. How I’d size one against the dry season is in my off-grid water guide.
How does hot water work in a house in Mexico?
In mine, a cold line runs by gravity from the roof tank to each gas boiler and carries on to the bathroom, and one hot line runs from the boiler to the fixtures. The toilet takes only cold; the shower and the sink take both. I have two economy de paso boilers, for the kitchen and the second bathroom, and a hybrid for the main bathroom.
Where to go next
The rainwater catchment, filtering and the three-stage wastewater system: off-grid water in Mexico
I self-managed the construction of my own house in San Cristóbal de las Casas, Chiapas, including the cistern, the gravity-fed system, the drains and vents, and the plumbing I learned to do myself. Everything here is from that build: what I paid, what I’d do again, and what I’d plan earlier.
Buying land in Mexico as a foreigner: buy the deed, or know you may not own it
The single most important thing I can tell you about buying land in Mexico: make sure it has a real deed — an escritura pública — or understand that you may not own what you think you’re buying. I learned this buying and registering land near San Cristóbal de las Casas, Chiapas.
PlaceSan Cristóbal, Chiapas
BuyerForeign resident
ZoneInterior (not restricted)
Key riskNo deed / ejido land
The short version
I bought and registered land near San Cristóbal de las Casas, and built my house on it. None of it was impossible — but it was only manageable because the land I bought could be legally registered in my name. That’s the line I wouldn’t cross.
What it took
I went through the SRE process foreigners use (the Article 27 convenio de renuncia), used a lawyer, registered the property, paid for a subdivision, and arranged co-ownership for my children. In Chiapas, and especially around San Cristóbal, it’s common to see land sold without deeds — cheap, beautiful, out in the countryside, exactly the kind of land foreigners dream about. But cheap land is often cheap for a reason, and the reason is usually legal.
The cheapest land often needs the most checking. A low price can mean no water, no services, difficult access, no permission to build, no escritura pública — or a legal status that prevents you from owning it at all. On this kind of purchase, “cheap” and “safe” are rarely the same plot.
Yes — but the structure depends on where the land is and what legal status it has. Outside the restricted zone — roughly 50 km from the coast and 100 km from a border — a foreigner can generally buy property directly in their own name, with the correct SRE process and a proper deed. That was my situation: titled land in the interior of Chiapas. Inside the restricted zone, along the coasts and borders, the process is different — foreigners normally use a fideicomiso (bank trust) rather than direct ownership. I didn’t go through that, so I won’t pretend to explain it from experience; if you’re buying near a coast or border, find a notary who specialises in it.
But the restricted zone isn’t the trap most people fall into inland. The bigger one is the legal status of the land itself.
The deed
The real question: does the land have an escritura pública?
In Mexico, land is often sold without a registered deed. That doesn’t automatically mean a scam — but it means you need to slow down. The question isn’t “is someone selling this land?” It’s “can this land legally be registered in my name?” That’s the difference between buying property and buying uncertainty.
A proper escritura pública is the document that matters: it shows the land has legal title and can be registered through the public property system. Without it you may have a contract, a receipt, or an agreement with a seller — but not necessarily ownership that protects you later. Having the land’s legal status checked before I bought was one of the most important parts of the whole process.
Types of land
The three kinds of land — and which I’d walk away from
If I were buying again, I’d sort every plot into one of three categories before doing anything else.
✓ What you want
Private titled land, with an escritura pública
Registered, clear, and legally yours once the purchase completes. Everything else is a question mark until proven otherwise.
~ Verify before trusting
Land that may be in a legal process
Being subdivided from a larger plot, or where the seller says the deed process is “underway.” It can be genuine — owners often sell plots to raise the money to then register them — but “underway” isn’t “done.” Make your own lawyer confirm exactly what can be registered, when, and in whose name.
✕ Walk away
Ejido, communal, conservation or no-deed land
Land that can’t currently be registered in your name. The view, the price, and the dream are all secondary to this. Ejido land in particular catches the most people — see below.
Ejido warning
Why you should not buy ejido land as a foreigner
This is the most important part, so I’ll be blunt, then tell you to confirm it yourself — because it matters that much.
Ejido land is communal agricultural land, held by a community of ejidatarios who have use rights under Mexico’s agrarian system. It’s tempting: cheaper than titled land, usually outside the towns, often exactly the space-and-nature plot a foreigner wants. Around San Cristóbal, many foreigners have put money into ejido land.
Here is the problem. If land is still ejido land, there is no normal private deed to register in your name. You may be able to pay someone, build, and live there for years — but you are not holding ordinary private property title. You’d be depending on informal arrangements and the goodwill of a community whose decisions can change. If the Ejido Assembly changes its members or simply changes its mind about who lives there, you could lose your home and have little or no practical legal route to recover what you paid.
I’m being careful with my wording because the consequences are so severe: this is my understanding as someone who bought land here and watched others navigate it, not legal advice, and the rules are technical.
The rule I’d give any foreigner
If the land is still ejido, don’t buy it. If someone tells you it used to be ejido but is now private property, make your own lawyer prove that with the registry before you pay a single peso.
There is a legal process (you’ll hear regularización or dominio pleno) that can convert ejido land into registrable private property. But most of the cheap “ejido” plots being sold have not completed that conversion. Until it’s done and there’s a real, registrable title, treat it as land you cannot own. And if someone discourages you from checking — that is your answer.
How to check
How to check land before buying in Mexico
The one check that matters most is whether the land can be legally registered in your name. In practice that means verifying the escritura pública, the current legal owner, the boundaries, the registry status, any debts or liens, and whether the land is private, ejido, communal or conservation. A good lawyer or notary does this as a matter of course. If there’s any chance of agrarian status, the Registro Agrario Nacional (National Agrarian Registry) is the place to confirm it; for private property, the local Registro Público de la Propiedad (Public Registry of Property). I wouldn’t rely on the seller’s word, the seller’s lawyer, or a neighbour saying “everyone does it.” For a foreigner putting savings into a build, the cost of checking is tiny next to the cost of buying land you don’t truly own.
Finding land
How I found my land
People assume you find land through an agent. You can, but it’s only one route — and not how I did it. In San Cristóbal there are roughly four ways.
Facebook is the main local marketplace in Mexico for almost anything, land included; local groups, including the San Cristóbal international-community ones, regularly post rustic plots. Established agencies like Remax and Century 21 have a real presence in Chiapas and feel familiar if you’re used to formal listings. Independent local agents advertise some plots online but rely heavily on their own “Se Vende” signs near the land; they’ll show you a plot but usually aren’t part of the legal sale — you deal directly with the owner, who pays the agent a commission behind the scenes. And the most old-fashioned route, which is how I found mine: a hand-painted “Se Vende” sign nailed to a fence near the property. Selling directly to avoid an intermediary is very common here — after I bought, the seller even offered me a commission if I found a buyer for a neighbouring plot. That’s how direct the market can be.
The actual plot
The plot I bought, with the hand-painted “Se Vende” sign still on the fence post — and the bike I scouted the area on. Outside San Cristóbal de las Casas, Chiapas.
However you find it, the rule is the same: finding the land isn’t the hard part. Verifying it is.
Scout the area
Spend time in the area before you buy
Don’t visit a plot once, fall for the view, and start imagining the house. Talk to people already living nearby — about water, access, electricity, transport, humidity, security, and whether land in that area normally has proper deeds. Make a list of non-negotiables before you start looking. Mine included distance: I knew I didn’t want to depend on cycling downtown every day, and I wanted cleaner air than the centre of town. I bought a small PM2.5 air-quality sensor, and it confirmed what I suspected — particle pollution is high in many Mexican towns, around traffic, dust and wood smoke, and much lower a couple of miles out.
The surprise was humidity. In the rainy season my indoor humidity runs higher out here than it would in town — which matters for comfort, mould, storage and materials. A plot isn’t just a price per square metre; it’s a microclimate, a water decision, and a transport decision all at once.
What it cost
What the purchase involved, and what it cost
I bought titled land outside the restricted zone, as a foreign resident. My lawyer handled the SRE permit. From getting that permission, signing the contract and paying a deposit, to the land being registered in my name took six months — a timeline that surprised me. If you’re planning a build, don’t assume finding land and owning land are the same stage; the purchase itself can take months, and you shouldn’t plan the rest of the build as if the land is yours the moment you agree a price.
The costs surprised me too — the price of the land was one thing, the cost of legally acquiring it was another. Here’s what I paid, separate from the land itself. Treat it as a real example from my 2017 purchase — the plans and planning permission came a little later, in 2018 — not a current price list; fees change, and lawyers include different things in their quotes.
What the purchase cost — 2017–18 example
Item
What I paid
Note
SRE Article 27 process
~MX$4,000
2017, included lawyer help. SRE sets the official fee yearly: for 2026 it is MX$5,250 for an individual buying outside the restricted zone (SRE’s costs-and-times page, checked October 2026). Check the current official amount and confirm what your lawyer’s quote includes
Lawyer, paperwork & registry
~MX$30,000
One of the largest non-land costs
Legal-status verification
~MX$650
Required in my process
Land valuation
~MX$600
The valuation isn’t the price you pay
Planning permission
MX$5,622
2018. Based on the official land value, not the purchase price
Architectural plans
MX$28,000
2018. Three design meetings plus a quote to build it; other architects quoted MX$20–25k for plans alone. Often free if the architect also builds — I was offered that; it’s a common incentive
Subdivision of the plot
~MX$10,000
My estimate — it sat inside larger bills; see below
As a rough local reference: on the outskirts with basic services, around MX$3,000/m²; closer to markets and more desirable areas, up to about MX$5,000/m². Those aren’t official prices — they move with location, access, slope, services, water, legal status and year — so treat them as a starting point, not a market rate. And be careful comparing a “cheap” rustic plot against titled land: once you account for missing water, deeds, access or build permission, the cheap one often isn’t.
Subdivision
Buying part of a plot: subdivision is possible
Worth knowing even if you don’t expect to need it: land can sometimes be subdivided as part of the purchase. In my case the seller let me buy half of a larger lot, which meant the land had to be legally divided and registered — handled at the same time as the purchase. I didn’t get an isolated figure for it (it sat inside larger bills); I’d estimate it at roughly MX$10,000 in 2017, but the real point isn’t the number — it’s that subdivision is an option, and one many buyers don’t realise exists. If you’re buying part of a property, don’t treat a fence line or the seller’s description as enough; you need to know the subdivision can be legally done and registered. The same goes in reverse — adjacent plots can sometimes be combined into one legal property (I built across two, so combining made sense). Handle it through the lawyer as part of the purchase, never informally.
Co-ownership
Co-ownership: a usufructo vitalicio for my children
From my actual deed
The page of my escritura naming my children as co-proprietors (identifying details redacted). The usufructo vitalicio that completes the arrangement was an additional page added to the same deed at purchase.
One of the most useful things I did — and something many foreigners don’t know to ask about — was arrange co-ownership for my children combined with a usufructo vitalicio (a lifetime usufruct) for me. I can’t take credit for the idea: my notary suggested it as soon as we started the purchase process and saw I had young children. I’m sharing it not as legal advice but because it’s an option worth knowing exists.
The structure, as it worked in my case: my children are named in the escritura itself as co-proprietors of the land, and I hold the lifetime usufruct — the right to use and control the property for as long as I live. On paper it was remarkably light: one additional page added to the deed. If something happens to me, the property is already structured to protect my children’s claim to it, rather than leaving everything to a long, costly inheritance process later. The family’s interest is built into the title from the start. And no — it doesn’t mean the children can sell the house out from under me after a Christmas-dinner argument: the usufruct is a lifetime right that stays attached to the property whatever happens, so as it was explained to me, no sale can strip me of the use of the place while I live.
What it doesn’t do — the trade-offs
The protection cuts both ways. My children are the underlying owners, so I can’t sell the property on my own either — the usufruct protects my right to live here for life, not my power to dispose of the place. A future sale would need everyone with legal capacity to agree, and while children are minors, Mexican law tightly restricts selling property held in their name at all — broadly, only where there’s real necessity or clear benefit to them, and with a judge’s authorisation. None of that worries me; it’s the point of the structure. But go in with your eyes open: you’re trading unilateral control for built-in protection, and that trade should be a decision, not a surprise.
Two more things worth raising with the notary before signing: ask whether the usufruct is drafted to cover not just the land but whatever you later build on it; and if the land is in Mexico’s restricted zone — near the coast or a border, which mine isn’t — the whole conversation changes, because foreigners hold property rights there through a different mechanism (a fideicomiso).
Adding it at the time of purchase also kept the cost down: the paperwork it relied on — the land appraisal, the registry work — was already being done as part of the purchase, so I didn’t pay for any of it twice. What it added was the notary’s fee and the transfer tax for the children’s share, which together came to under MX$10,000 in 2017. Arranged separately later, the same protection would have meant paying appraisal and registry costs all over again. And there’s a quieter saving underneath that, as I understand it: everything was calculated on the value of raw land, before any house existed. The house I built afterwards simply became part of land my children already co-owned — not a separate asset that would one day need transferring to them at house prices. Confirm how that works for your own case with the notary; this is exactly what they’re for.
So if you’re buying land here and have children or long-term family considerations, raise it with your notary at the start of the purchase, not after — ask directly about ownership structure, usufructo and inheritance. I wouldn’t assume my arrangement is right for everyone — nationality, tax, marriage, inheritance and future plans all matter — but don’t leave that conversation for later.
No water
If the land has no water
Land doesn’t always come with a water connection. Mine didn’t — and that changes the real cost of a plot. Your options may be rainwater catchment, trucked water, a local connection, or a well. In my area a drilled deep well (pozo profundo) was quoted at around MX$80,000 to drill, pipe, fit a pump and connect to the house, based on a depth of about 25 metres with extra cost per metre beyond. Before assuming you can drill, check the requirements: water is regulated, wells may need permission, and as a foreign resident you should have your lawyer confirm exactly what permit you need for your situation before spending. I cover the full water system — cistern, pump, gravity feed and plumbing — in water system for a house in Mexico, but for land buying the point is simple: no water isn’t a detail, it’s one of the biggest factors in whether a plot is actually affordable.
If you do end up relying on rainwater, the roof you build matters more than you’d think — the material changes how clean the captured water is. I get into that in tin roof vs concrete roof in Mexico.
My pre-purchase checklist
Does the land have an escritura pública, and can it be registered in my name?
Is it private property — or ejido, communal, or conservation land?
Has an independent lawyer or notary (not the seller’s) checked the legal status in the property and agrarian registries?
Is the seller the actual legal owner, and is the plot free of debts, liens or boundary disputes?
Is there legal road access, water, and electricity nearby?
Is the land flat and stable enough to build what I want affordably?
Can I get permission to build what I’m planning?
If it’s being subdivided, can the subdivision be legally registered?
If I have family, what ownership or inheritance structure makes sense?
What’s the total cost after legal work, water, access, plans and services — not just the land price?
Final advice
What I’d tell another foreigner buying land here
Spend time in the area first. Decide your non-negotiables before you fall for a plot. Then slow down before paying — because the most dangerous moment is when the land feels perfect and you want the deal to be true. That’s exactly when you need to become boring: ask for the deed, ask who owns it, ask whether it’s private property, ask whether it was ever ejido land, ask whether it can be registered in your name. Ask your own lawyer, not the seller’s. Ask the notary. Ask the registry.
If the land has a clear escritura pública and your own independent professional confirms it can be registered in your name, you’re dealing with something solid. If it has no deed, or is still ejido, communal or conservation land, understand what that means before you pay: you may be buying a hope, a promise, or an informal right to occupy — not ownership.
Buy the deed. Or know exactly what you’re getting without it.
Written by Luke Burchell
I bought and registered land, then self-managed the construction of my own house, in San Cristóbal de las Casas, Chiapas — handling the permits, the lawyer, the registry and the build myself, while living locally. Everything here is from that experience.
Tin roof vs concrete roof in Mexico: mine cost more, and I’d choose it again
Most people assume a tin roof is the cheap option and a poured concrete roof is the “proper” one. On my own build in San Cristóbal de las Casas, Chiapas, it was the other way round: the tin roof cost me more — and after living under both, it’s the one I love.
PlaceSan Cristóbal, Chiapas
Tin roof paid2022
BuildSelf-managed
RoofsBoth, side by side
✓ What I paid~ Estimated
The surprise
One thing almost nobody guesses about my house: the tin roof — lámina, as it’s called here — and its metal frame cost me more than pouring a concrete one would have. I went in assuming the opposite — and I was wrong by about MX$10,000. The roof was one line in what the whole house cost me to build; here’s what surprised me most.
Why I can compare
I have both kinds of roof on the same house — roughly half tin, half poured concrete — which is the only reason I can compare them honestly. I chose the tin for the half I cared most about, mostly for how it would look and feel inside. And now, having lived under both through several rainy seasons, the tin is the one I’d choose again, while the concrete one is the one I lie awake thinking about. This is what I actually learned, including the costs, the mistakes, and the freak accident I couldn’t have planned for.
The roof verdict
Cost surprise
Tin cost more
My tin roof came to about MX$40,000✓ in 2022, against roughly MX$30,000~ for the concrete slab I’d assumed would be the pricier one.
What I’d choose
Tin, again
Lighter, cleaner for rainwater and lower-maintenance. The concrete half is the one that cracked and needs repainting.
The exception
Concrete if you’ll build up
Planning another storey later? A concrete slab gives you a floor to build on. Tin doesn’t.
By the time the walls were up and the house was taking shape, I’d relaxed into managing the build and started enjoying the parts where I could improvise. The roof was one of those decisions. I wanted to put an exposed industrial-style metal frame inside the house — beams running across the structure — and a tin roof let me do that. It looked the way I wanted, and it had two practical advantages I talked myself into as well.
The first was weight. A tin-and-metal roof is far lighter than a slab of poured concrete sitting on top of your walls. In a region with regular earthquakes, that felt sensible to me as the person managing the build. I wouldn’t treat it as structural advice — the whole building has to be designed properly, walls and beams and foundations together — but I liked the idea of reducing unnecessary weight overhead. For official background, see the CENAPRED guide to safer self-built housing, published by SEDATU.
The second advantage was the one I got wrong: I assumed tin would be cheaper. It seemed obvious — no slab to pour, no truckloads of concrete. That assumption is where the lesson is.
The cost
Tin roof vs concrete roof cost: where my money went
From the actual build
Inside my build before the ceiling was finished: the exposed steel frame and the plywood decking that sits under the tin — the lámina itself goes on top, out of sight from below. Corrugated roofing sheet is stacked on the floor. San Cristóbal de las Casas, Chiapas.
The tin roof cost me about MX$40,000 in 2022. The equivalent concrete roof would have come in closer to MX$30,000. Here’s why, because the savings and the costs don’t land where you’d expect.
A tin roof does save you real things. I saved roughly two weeks of labour by not having to build and pour a slab — and pouring a concrete roof means first building a whole temporary timber platform underneath it to hold the wet concrete while it cures. That platform eats dozens of planks and supports. Skip the concrete roof and you skip all of that.
But then the tin roof spent the savings back, and more. Under the tin I put a layer of plywood — partly to soften the sound of rain, partly for the look inside — which was a real cost. The metal beams themselves weren’t cheap, and I painted them and helped the builder lift them into position. Then I had to pay someone for a full day of welding to join the metal frame together. Add those up and the “cheap” roof had quietly become the expensive one.
The honest summary
Tin saved me labour and timber, then spent it back on plywood, beams and welding
A tin roof can be built cheaply if you hold it up with a simple, economical structure. Mine wasn’t simple — the exposed metal frame was a design choice I paid for. Both wood and metal frames swing enormously in price depending on the quality and the craftsmanship. So “tin is cheaper” isn’t a rule; it depends entirely on what you hang it from.
From the actual build
The concrete side of the argument, on my own build: a roof slab ready for pouring — the rebar mesh, the electrical conduit for the ceiling below already buried in the slab, and beneath it all the temporary timber platform that holds the wet concrete while it cures. San Cristóbal de las Casas, Chiapas, 2023.
Tin vs concrete
Tin roof vs concrete roof: cost, comfort and maintenance
After living with both, here’s the comparison I wish I’d had before I started. These are my conditions in San Cristóbal — your climate and prices will differ — but the trade-offs are the part that travels.
Tin vs concrete, side by side
Tin (aluminium & zinc)
Poured concrete
Cost (my build)
~MX$40,000 ✓More, because of the metal frame and plywood (paid 2022)
~MX$30,000 ~Cheaper here, despite the slab and platform
Lifespan
Many yearsAnd you can often lay new sheets over old ones if they wear
Long, in theoryBut cracks change everything — see below
Maintenance
Very low so farDoesn’t crack or absorb water; fixings and flashing need an occasional eye
Repaint ~every 4 yearsFlexible waterproof paint, ~MX$3,000 in paint and labour each time
Weight
Very lightLess mass on the walls; seismic performance depends on the whole design
HeavyA full slab sitting on top of the structure
Captured rainwater
Much cleanerWhat I send to the cistern for the house
DirtierI only use it for washing clothes
Sound of rain
Wonderful — mostlyPlywood underneath helps; heavy rain can still drown out the TV
SilentYou won’t hear the weather at all
What people here call lámina is usually galvanised or zinc/aluminium-coated sheet metal, depending on the product you buy. The better versions are made not to rust quickly, and a well-installed roof lasts many years. If the sheets eventually wear, replacing them is far simpler than repairing a failed concrete slab — and in some cases you can fix new sheets over the old ones if the structure underneath is still sound.
The freak accident
The week I thought I’d made the wrong call
A week after the tin roof went on, a neighbour hired someone to clear boulders from their plot with dynamite. The explosions threw rock high into the air, and three pieces came down through my brand-new roof, punching clean holes in it. I was devastated, and for a while it made me question whether I’d chosen wrong.
I want to be clear about this, because it’s easy to draw the wrong lesson: that was bad luck, not a flaw in tin roofs. Falling rock from a dynamite blast would have damaged almost anything, and the holes in tin are, if anything, among the easier things to patch. It felt like a verdict on my decision at the time. It wasn’t. It was just a bad week.
Concrete cracks
The concrete roof is the one that haunts me
Here’s the part that really settled the argument for me. The poured concrete roof — the “proper” one — is the roof I struggle to sleep over. A few months after it was poured, I found large fissures running through it. The likely causes were heat, not keeping the concrete damp enough while it cured, and possibly the slab not being supported well enough during the pour and curing. Whatever the exact mix, the result was a cracked roof and leaks.
I fixed it, and the way I fixed it matters, because my first attempt failed.
How I fixed the cracks — after getting it wrong once
Chase the crack, fill it, then protect it
My first go used a cheaper, tar-like filler. It sealed perfectly for about a year, then kept shrinking after application until it was useless. Don’t bother with it.
What actually worked, for non-structural cracks like mine: open each crack out with an angle grinder and a cutting disc, fill it with an adhesive made specifically for concrete — I used Fester Sellador y Adhesivo FT-201, about MX$300 on Amazon Mexico — then cover it with geotextile cloth and roofing paint. That combination has held. But if a crack is wide, moving, sagging, or looks structural rather than just a surface fissure, get someone qualified to inspect it before treating it as a simple waterproofing job.
Maintenance is the quiet difference the brochures never mention. The concrete roof needs repainting with flexible waterproof paint roughly every four years — around MX$3,000 in paint and labour each time, depending on size — or the cracks come back. The tin roof asks for nothing.
Exposed-ceiling trick
A trick for an exposed concrete ceiling
One advantage of managing your own build is that you can experiment as you progress with the build. Over my dining area, which has a low ceiling, I wanted a smooth, modern grey concrete finish on show rather than something to be plastered over. So I had the mason use plywood as the formwork to pour the ceiling against.
The cooking-oil experiment
A thin smear of cooking oil stops the concrete gripping the formwork
I painted the plywood first to protect it and let me reuse it. Then, just as they started pouring, I rubbed a thin layer of ordinary cooking oil over the wood with my fingers. The oil stopped the concrete bonding to the plywood, so it peeled away cleanly — leaving a smooth exposed ceiling and plywood I could use again instead of writing off. It cost almost nothing and worked.
Cleaner water
The bonus I didn’t expect: cleaner water
Because I capture rainwater, the roof material turned out to matter in a way I hadn’t planned for. Water coming off the tin roof is far cleaner than water off the concrete one — concrete is more porous and holds dust, residue and surface grit, while metal sheds water straight off. So I route them differently: the tin roof feeds my cistern, which supplies the bathrooms and kitchen, while the dirtier concrete-roof water goes to a separate tank for washing clothes. How that stored water then gets pumped up and fed to the taps is its own build — I cover it in the water system for a house in Mexico. If you’re going to harvest rainwater, the roof you choose quietly decides how clean that water is — and the catchment, filtering and dry-season storage are their own build, which I cover in off-grid water in Mexico.
One caveat, so nobody takes this too far: cleaner doesn’t mean automatically drinkable. Whether roof water is safe to drink depends on filtration, storage, a first-flush system, animals, and what’s in your local air — not just the roof. What I’m saying is narrower: for capturing cleaner water to store and filter, the metal roof wins clearly.
And if you’re buying land with no water connection at all — as I did — the roof is only half the picture. Whether a plot has water, or needs a well or catchment, is one of the biggest hidden costs in buying land in Mexico as a foreigner.
After every rainy season I’m more sure of it: the roof that cost me more is the one I’d build again, and the cheaper one is the one I have to keep an eye on.
The verdict
So — would I choose tin again?
Yes, without much hesitation — but not because it’s cheaper, because it usually won’t be once you account for the frame. I’d choose it for what it gives back afterwards: no cracks in my sheets so far, cleaner captured water and less maintenance on my build, less weight on the walls in earthquake country, and the sound of rain on a high ceiling, which I find genuinely lovely even on the nights it’s loud enough to bury the television. The concrete roof was meant to be the safe, solid choice. In practice it’s the one that cracked, the one I repaint, and the one I think about when it rains hard. The tin one just sits there and does its job.
There’s one case where I’d still pick concrete, though: if you might build another storey on top later, a poured slab gives you a floor to build on, and tin doesn’t. If there’s any chance of going up a level down the line, that can outweigh everything above.
What I’d change
What I’d do differently
Two things, both about deciding earlier. I’d make the roof decision sooner, and I’d think about rainwater catchment before the walls were finished rather than carrying it vaguely in the back of my mind. Where the water drains, where the gutters go, how the slope works, how the water reaches the cistern — all of that is easier to get right while the structure is still open than to retrofit afterwards.
And I’d price the roof as a whole system, not as sheets of lámina. The real cost isn’t the covering — it’s the beams, the welding, the wood underneath, the paint, the labour, the gutters, the drainage, and the waterproofing if you go concrete. Adding all of that up in advance is what would have saved me the surprise of the “cheap” roof turning out to be the expensive one. That’s the part I underestimated, and it’s the single thing I’d tell anyone starting out.
I self-managed the construction of my own house in San Cristóbal de las Casas, Chiapas — coordinating the masons, the metalwork, the plumbing and the finishing myself, while living locally. Everything here is from that build: what I paid, what I’d do again, and what I’d do differently.
