Why aren’t buildings constructed the same way in
Costa Rica, Europe, the U.S., and Canada
Construction Regulations. When someone from Europe comes to Costa Rica and starts noticing how houses are built, one of the first differences that stands out is the construction system.
In Costa Rica, we very frequently encounter buildings made of concrete blocks, reinforced concrete, and steel reinforcement, within structural systems designed for local conditions. In Europe, the landscape is much more diverse: ceramic masonry, reinforced concrete, autoclaved aerated concrete (AAC), wood, steel, and prefabricated systems.
If we cross the Atlantic, the differences continue. In the United States, wood-frame residential construction is very widespread, and housing codes explicitly address local criteria such as snow, wind, seismic activity, flooding, freezing, and termite risk—the IRC 2024 (International Residential Code) establishes specific requirements for wood-frame buildings, differentiated by seismic and climatic categories.
In Canada, wood also plays an important role in residential construction, but buildings must be designed to withstand an environment where cold, snow, wind, and energy efficiency are of major importance. The National Building Code of Canada 2025 includes updated requirements regarding resistance to lateral loads caused by wind and earthquakes, as well as energy performance requirements—the 2025 edition even includes climate data projected for the next 50 years.
So, the question isn’t “which country builds better?” but “why was each system developed the way it was, and what codes govern it?”
The builder moves. The rules do NOT.
A European builder coming to Costa Rica may have extraordinary experience—years of working with BCA, brick, wood, concrete, or steel. But when they start working here, they must comply with the standards and codes applicable in Costa Rica. Similarly, a Costa Rican builder who goes to Europe cannot simply take the system they’re used to and assume that the same rules apply there. The same goes for the U.S. or Canada.
Professional experience travels with the builder. The building code, however, belongs to the place where construction takes place.
In Costa Rica, the main regulatory documents are the INVU Construction Regulations (mandatory; establishes responsibilities, technical documentation, and design and construction requirements) and, for structures, the Costa Rican Seismic Code. The current published code is the Código Sísmico 2010 – Revisión 2014, and the process for the new edition, CSCR 2025, is underway, following the CFIA’s approval of the final text in November 2025.
Europe, in turn, has the Eurocodes family (EN 1990–EN 1999, ten standards covering actions on structures, concrete, steel, wood, masonry, geotechnics, and seismic design), which are applied in conjunction with each country’s national regulations—a house in Greece is not designed under the same conditions as one in Sweden.
An earthquake doesn’t judge a house by how beautiful it is
A structure designed in Europe may be perfectly valid where it was designed—beautiful, solid, and impeccably built. But that doesn’t automatically mean it can be built in Costa Rica without the design taking local seismic requirements into account.
During an earthquake, a house isn’t judged by its appearance, but by how it was designed to behave when the ground starts to shake. The correct way to put it isn’t “European houses collapse in Costa Rica,” but rather: a structure designed without taking Costa Rica’s seismic requirements into account may be vulnerable, even if the system is perfectly valid in the region for which it was intended.
Why do you see so many concrete blocks in Costa Rica?
Costa Rica is a country with significant seismic activity, and structural design is addressed accordingly by the Código Sísmico—which is not a list of materials, but rather establishes requirements for the behavior and design of structures under seismic loads. That’s why, when we look at a Costa Rican house, we don’t just analyze the visible wall, but the entire system: the foundation, the reinforced concrete elements, the vertical and horizontal reinforcement, the masonry, the connections between elements, the floors, and the roof. A block is not just a block. It is part of a structural system.
Four regions, four systems
If we compare the four regions side by side, the differences become very clear:
🇨🇷 Costa Rica — reinforced concrete, blocks, and masonry, within a regulatory framework where seismic design is of major importance (Código Sísmico).
🇪🇺 Europe — concrete, masonry, aerated concrete (BCA), wood, steel, and many other systems, within the framework of the Eurocodes, applied in conjunction with each country’s national regulations.
🇺🇸 United States — widespread use of light-frame wood construction, within a code system (IRC) that takes local geographic conditions into account: snow, wind, earthquakes, floods, freezing temperatures, and termites.
🇨🇦 Canada — a strong tradition of wood construction within a regulatory framework (National Building Code) that addresses cold, snow, wind, earthquakes, and energy efficiency.
This comparison highlights an important point: there is no single “correct” way to build a house. There are systems developed for specific conditions and governed by specific codes—each region has established its own regulatory framework based on the threats it actually faces: earthquakes in Costa Rica, climatic diversity in Europe, a combination of snow, wind, earthquakes, and termites in the U.S., and cold weather and energy efficiency in Canada.
The Physics of Foundations: Why Tropical Soil Doesn’t Forgive Mistakes
The foundation is the “sole” of the house. In Europe, stable soil allows for simpler techniques. In Costa Rica, soft or clayey soil shifts frequently and accumulates large amounts of water during the rainy season (invierno).
Insulating the rebar from the ground. The physics of materials are unforgiving. If the rebar (varillas) and welded wire mesh (malla electrosoldada) are placed directly on bare ground, moisture causes them to rust quickly—rusted rebar swells and cracks the concrete from the inside. The rebar must be raised on special concrete spacers so that it is completely embedded in the cement and not in contact with the ground.
Site preparation. Pouring concrete directly onto soft soil contaminates it and destroys its strength—the soil instantly absorbs the water from the fresh cement, the chemical reaction stops prematurely, and the concrete becomes porous and sandy. The ground must be properly excavated and covered with a layer of compacted stone or gravel (slabs, at least 15 cm thick, compacted to 95% Proctor density)—under no circumstances should a plastic sheet be placed directly on the ground.
Reinforcement spacing. There is no single valid value for every project—it depends on the calculation, based on the soil study. But the principle is simple: the greater the distance between the bars, the less resistance the rebar provides against movement. A contractor who places rebar at 60 cm instead of the calculated spacing (often much denser, ideally 40 cm) saves on materials but weakens the structure’s ability to withstand an earthquake. Always ask for the plan—don’t just go with “that’s how I usually do it.”
The Chemistry of Cement and the Test of Time
Concrete doesn’t simply “dry”; it undergoes a long chemical process called curing.
The 28-day rule. Concrete reaches its maximum strength only after nearly a month. Haste is the greatest enemy on a construction site—do not erect heavy walls on a freshly poured slab.
Mandatory watering. The tropical sun and wind evaporate the water from the mixture far too quickly. Fresh slabs, columns, and walls must be watered generously at least twice a day for a minimum of one week. Without this treatment, the structure develops microcracks due to shrinkage.
A house built correctly, with due regard for the chemical stages of cement curing, can withstand decades and hundreds of earthquakes without a single crack.
Water-repellent “Repello” and water-repellent cement
In addition to the structure, exterior finishes are just as important in this climate. “Repello” is the plaster applied to exterior walls, but the correct option for Costa Rica is the water-repellent version — it contains additives (latex, polymers, microfibers) that repel rainwater and reduce cracking, unlike regular plaster, which would absorb constant moisture and weaken the structure over time.
Similarly, water-repellent cement contains additives that reduce the porosity of concrete, preventing water from penetrating and weakening the structure from the inside—recommended especially for foundations, retaining walls, and any element directly exposed to ground moisture or rain.
Confusion Over European Materials in Seismic Zones
Materials such as aerated concrete (BCA) or traditional polystyrene insulation are popular in Europe for their thermal efficiency. In Costa Rica, these materials lose their effectiveness due to extreme humidity (often over 90%) and tectonic activity. BCA essentially acts like a sponge—it absorbs large volumes of water during torrential rains and becomes brittle under the action of seismic waves. This doesn’t mean that BCA is “banned”; it simply means that standard construction systems differ, and a material is not the same as a structure.
Local Solutions: Why “Lightweight” Means Safer
Local systems in Costa Rica have been refined over decades to suit this specific environment.
Lightweight (liviana) construction on a galvanized steel frame—considered the gold standard. The steel structure is elastic; it absorbs shock waves through flexible deformation and returns to its original shape without breaking. Unlike wood, which can be destroyed by termites in 6–12 months without proper protection, galvanized steel is immune to insects and does not rot due to condensation.
The locally prefabricated system (slabs and columns) — a good choice for tighter budgets. The slabs and columns are manufactured in a factory, where the concrete is mechanically vibrated to remove air bubbles, providing much greater density and strength than concrete mixed by hand on-site. The modular structure allows the house to absorb seismic vibrations through micro-joints, preventing major cracks.
What if we move a house from one region to another?
A structure built with blocks and reinforced concrete doesn’t become useless just because it crosses a border—but it must meet the requirements of the new location. In a cold European region, it’s not enough for the structure to be stable; the building must also meet thermal performance and energy consumption requirements. In short: a Costa Rican house can make it to Europe—it’s just that winter needs to be convinced.
The same rule applies to North America. A house built in the United States according to a local code is designed for the conditions and requirements of that jurisdiction. A house built in Canada is designed for different conditions. Even within the United States, there are enormous differences between regions—a house in an area with heavy snowfall is not designed like one in a tropical area, a house in an earthquake-prone region does not have the same requirements as one in a region with low seismic activity.
That’s why an American or Canadian builder coming to Costa Rica can’t just say, “This is how we do it back home.” They can say, “This is my experience”—but the next question remains the same: “And what does the Costa Rican building code say about this type of construction?”
How to vet a contractor before they start pouring concrete
- Ask for the structural plan, not just a sketch
- Request the soil study for significant projects (house foundations)
- Inspect the site physically before pouring: Is there a layer of compacted stone under the structure? Is the rebar visible at the spacing shown in the plan?
- A high price doesn’t guarantee the right materials
- Verify the minimum formal qualification requirements
Conclusion
There is no such thing as a “European,” “American,” or “Costa Rican” house—there are construction systems developed for specific conditions and regulated by standards unique to each region. When you build a house in Costa Rica, you’re not just paying for walls—you’re paying for your family’s safety. Follow local building codes, protect the rebar from moisture, cure the concrete properly, and choose systems designed for this climate.
Professional experience travels with you.
Building codes, on the other hand, must be followed wherever you build.
Behind OpenZone are two people: a Costa Rican native with deep roots in the local history, and an expat who has been settled here for over two decades. Together, we combine native knowledge of the system with firsthand experience of the very process you’re going through right now.
