Climate Resilience 2026: Building to Keep It Hot Outside and Cool Inside

Climate Resilience in Construction: Why 2026 Is a Turning Point

Climate resilience in construction will no longer be a niche topic by the summer of 2026. August will once again bring heat waves to Switzerland with temperatures exceeding 35 degrees—and landlords and homeowners are under pressure. That’s because tenants expect cool rooms without their electricity bills skyrocketing due to air conditioning.

New projects in Zurich, Basel, and French-speaking Switzerland show that well-designed architecture and targeted renovation can effectively keep heat out—in a way that is structurally sound, cost-effective, and sustainable.

What does climate resilience in construction mean, specifically?

Climate resilience refers to a building’s ability to withstand extreme weather conditions—without active cooling systems. In the summer of 2026, heat protection will take center stage. A climate-resilient building keeps the indoor temperature stable at below 26 degrees, even when outdoor temperatures exceed 33 degrees.

This cannot be achieved through a single measure, but rather through the interaction of several building components. Swiss architectural firms now refer to a holistic heat protection concept.

Concrete Building Concepts from Switzerland 2026

1. Thermal mass and nighttime ventilation

Heavy building materials such as concrete, brick, or clay store heat during the day and release it at night. Combined with targeted nighttime ventilation—that is, opening windows and skylights in the evening—the indoor temperature drops without any energy consumption.

A pilot project in Zurich-Altstetten (scheduled for completion in spring 2026) is fully committed to this strategy. The apartment building, which has 18 units, operated without air conditioning and reached a maximum indoor temperature of 25.4 degrees in June 2026.

2. Exterior blinds and shading elements

Exterior blinds are up to five times more effective than interior roller shades. They reflect the sun’s rays before they reach the glass. Starting in 2026, new buildings in Basel will also incorporate extended roof overhangs and green pergolas as permanently installed shading elements.

Important: The building's orientation plays a key role. South- and west-facing facades require significantly more protection than north- and east-facing sides.

3. Green Facades and Green Roofs

Green facades cool buildings in two ways: Plants provide shade for the exterior wall and cool the surrounding air through evaporation. In Lausanne, a late-19th-century building was renovated in 2026, and its newly greened west facade reduced the wall’s surface temperature by up to 18 degrees.

Green roofs have a similar effect and also offer benefits in terms of rainwater retention—a definite plus given the increasing frequency of heavy rainfall in Switzerland.

4. Thermal insulation with heat-shielding properties

Not all insulation protects against heat. Phase-change materials (PCM) and insulation materials with high heat storage capacity—such as wood fiber boards—delay the penetration of heat into the building’s interior by many hours. This gives nighttime ventilation time to dissipate the stored energy.

Checklist: Heat Protection for Landlords and Property Owners

These measures can be implemented in phases and can also be applied to existing buildings:

Retrofit exterior blinds (high impact, moderate cost)
Develop a nighttime ventilation plan (cross-ventilation, skylights)
Plan and Get Funding for Green Facades
Incorporate a green roof during the next roof renovation
Consider Thermal Mass in Major Renovations
Using PCM Insulation Materials in Facade Renovations
Ensure Sun Protection Is Contractually Guaranteed in New Rental Apartments

What does this mean for landlords in Switzerland?

Those who invest in more climate-resilient buildings today stand to benefit in several ways: lower operating costs, higher tenant satisfaction, and a better ranking in the GEAK rating. In addition, properties with poor heat protection are expected to be subject to stricter cantonal regulations starting in 2027.

The good news: Many measures are eligible for funding. Through the federal and cantonal Building Program, as well as cantonal funding programs—such as those in Zurich or Geneva—you can secure grants covering 20 to 40 percent of the investment costs.

Conclusion: Cool buildings are feasible by 2026—without air conditioning

The heat waves of the summers of 2025 and 2026 have shown that passive heat protection is not a vision of the future, but standard building practice. Swiss projects prove that climate resilience in construction works—and that owners who act now will have the upper hand in the long run.

The combination of thermal mass, shading, greenery, and smart ventilation outperforms any air conditioning system—both ecologically and economically. For SmartLandlord readers: If you want to future-proof your property, it’s best to start planning your renovation for 2026/2027 now.