Heat-Resistant Homes in the Netherlands: What to Check Before You Buy (2026)
For the first time ever, the Netherlands went code red for heat. Before you buy, here's how to tell whether a home will stay liveable in a heatwave — and which features actually keep a Dutch house cool.
A heat-resistant home is one that lets in and stores as little heat as possible. In Dutch practice that means a well-insulated roof, façade and quality glazing; external sun shading (zonwering) on the south- and west-facing windows; a high energy label (A or above); the ability to ventilate at night; and ideally a heat pump that also cools through the floor. What you want to avoid is a top-floor flat under a flat roof with large, unshaded glass. On 25 June 2026 the KNMI issued the country's first-ever code red for heat — so "how does this home handle heat?" is no longer a once-a-decade question.
Key takeaways
The Netherlands hit its first-ever code red for heat on 25 June 2026 — up to 40°C across 8 provinces. Summers like this now belong on every buyer's checklist.
A heat-resistant home lets in and stores as little heat as possible: good insulation, a high energy label, external sun shading and night ventilation.
The winter question ("how costly to heat?") now has a summer twin: how hot will the bedroom be at night?
Be wary of a top-floor flat under a flat roof and large, unshaded west-facing glass.
The strongest option is built-in cooling — a heat pump with floor cooling in a well-insulated A+ home.
Why is the summer of 2026 different?
Because the Netherlands has never seen heat like this on its official warning scale. On 25 June 2026 the KNMI declared a national heatwave at its De Bilt benchmark — a third day above 30°C — and issued the first-ever code red for heat across eight of twelve provinces, with temperatures forecast up to 40°C (NL Times, DutchNews). A Dutch heatwave is defined as at least five consecutive days above 25°C, including three above 30°C. Summers like this are becoming more frequent — which is exactly why heat performance now belongs on the buyer's checklist.
What is the new "second question" when buying a Dutch home?
For decades, the first question Dutch buyers asked was: how expensive will this place be to heat in winter? That question hasn't gone away — but it now has a twin: how hot will the bedroom be at night during a heatwave?
A home you buy today, you'll likely live in through many more summers like 2026. The good news: the answer is largely structural — built into the house — so you can assess it before you make an offer, not discover it on the first sticky July night.
What makes a Dutch house overheat in summer?
Heat enters through glass and through the roof, and it lingers in heavy materials. Three things drive overheating:
Top floor under a flat roof. Upper floors and flat roofs heat first and hold it longest; a poorly insulated roof radiates heat into the rooms below all evening.
Large south/west glazing with no external shading — unprotected glass acts like a greenhouse.
The street itself. Asphalt and paving store heat and release it at night (the urban heat-island effect); trees, greenery and water nearby measurably lower the temperature around the home.
Energy label (energielabel) — every Dutch home for sale must by law carry a label from A++++ (most efficient) to G. A higher label means better insulation, a more stable indoor climate and — the part buyers forget — cooler summers, not just cheaper winters (DutchNews).
Which windows get hottest — and when?
Orientation decides when a room overheats:
East-facing windows heat in the morning, then release.
South-facing windows heat at midday — but the high midday sun is the easiest to block from above (overhang, awning, screen).
West-facing windows are the trap: the low evening sun strikes them long and hard, right when you're trying to sleep.
External sun shading (zonwering) — shutters, screens or awnings mounted on the outside of the glass. External shading stops heat before it enters and is far more effective than internal blinds or curtains, which block light but trap the heat indoors.
What should I look for in a heat-resistant home?
A building that resists heat in both directions. Good insulation works both ways: in winter, warmth leaves slowly; in summer, heat enters slowly. The roof matters most, because it takes the full sun. Add quality glazing (HR++ or triple), external shading on the south and west, and a high energy label — well-insulated homes stay warmer in winter and cooler in summer, and a high energy label tends to hold its value.
Buying an apartment? Check the layout — and the VvE
In a flat, two things decide your summer comfort: whether you can create a through-draught, and whether you're allowed to add protection. A through-apartment layout (windows on opposite sides) lets you flush hot air out at night — spuiventilatie (purge ventilation). A single-aspect flat can't be properly aired.
VvE (Vereniging van Eigenaren / homeowners' association) — the body that governs a Dutch apartment building. Before you buy, check its rules: are you allowed to fit external sun shading, roller shutters, air conditioning, a heat pump or a green roof? If the VvE forbids external shading, your options shrink to curtains.
What does a truly heat-ready Dutch home look like?
Increasingly, cooling is built into the house — usually new or near-new homes with an A+++ or A++++ label. The typical recipe: a heat pump, underfloor heating that also cools, solar panels and strong insulation.
Heat pump + floor cooling (warmtepomp + vloerkoeling) — an electric heat pump can run in reverse in summer, circulating cool water through the underfloor system: gentle, silent cooling with no separate air-conditioner.
This isn't theory. At Krekenlanden in Nieuwkoop, new-build homes are delivered with an A++++ label, an air-to-water heat pump and active floor cooling as standard (krekenlanden.nl). There's a financing angle too: an A++++ label can add up to €40,000 to your mortgage capacity — which helps offset the cost of a cooler, more efficient home.
The strongest formula
The most heat-resistant Dutch homes tend to combine:
Energy label A or higher (well-insulated roof, façade and glazing)
External sun shading on south- and west-facing windows
Not a top-floor flat under a flat roof
Windows facing more than just south/west — openable on opposite sides for night ventilation
Greenery, shade and water around the building, not bare asphalt
You can't control the next heatwave. You can control whether the home you buy turns into an oven when it arrives — and that's a structural question, readable on the energy label, the roof, the orientation and the VvE rules long before the thermometer hits 40 again. That's exactly the kind of check we run before our clients commit. Reach us at team@expatgate.nl.
Frequently asked questions
What is the most heat-resistant type of home in the Netherlands?
A well-insulated, high-energy-label house (A or above) that is not a top-floor flat under a flat roof, has external sun shading on its south/west windows, and can be ventilated at night. New-builds with a heat pump and floor cooling go furthest.
Does a high energy label keep a house cooler in summer?
Yes. A higher energy label means better insulation, which slows heat coming in as well as leaving — so well-rated homes stay cooler in summer, not just warmer in winter.
Can a heat pump cool a house in summer?
Many can. A heat pump linked to underfloor heating can run in reverse to circulate cool water through the floor, providing quiet cooling without a separate air-conditioner.
Which windows make a Dutch home hottest?
West-facing windows are usually worst: the low evening sun strikes them long and hard right before bedtime. East warms in the morning; south is hot at midday but easiest to shade from above.
Are top-floor apartments hotter during a heatwave?
Generally yes — upper floors and flat roofs heat up first and hold heat longest, especially if the roof is poorly insulated.
