Heat pump in an existing home: is your Dutch house suitable?

Heat pump in an existing home: is your Dutch house suitable?

Half of all Dutch homes were built before 1980. These are houses with uninsulated cavity walls, single or double glazing, and a gas boiler that runs flat out from October through April. Can you install a heat pump in one of these?

The honest answer: it depends. A heat pump can work in virtually any existing home. But not every type of heat pump works in every home. And sometimes the sequence "insulate first, heat pump second" is not optional -- it is mandatory.

The suitability check: seven questions about your home

Walk through these questions. They give you a first indication of whether your home is ready, or whether preparation is needed.

1. What is your energy label?

• Label A or B: excellent candidate for all-electric
• Label C: suitable for all-electric with minor adjustments, ideal for hybrid
• Label D: hybrid is the safest choice; all-electric only after insulation upgrades
• Label E, F, or G: insulate first, heat pump second

No energy label? Your annual gas consumption serves as a proxy. Under 1,200 m3/year: well-insulated. Between 1,200-1,800 m3: moderately insulated. Above 1,800 m3: insufficiently insulated for all-electric.

2. How is your roof insulated?

An uninsulated roof lets 25-30% of heat escape. Minimum RC value for a suitable roof: 2.5; ideal is 3.5 or higher. Roof insulation is typically the cheapest measure (1,500-4,000 euros) with the biggest impact.

3. Does your home have cavity wall insulation?

Most homes built between 1920 and 1975 have unfilled cavities. Cavity wall insulation costs 1,000-2,500 euros for an average terraced house and brings the wall RC value to 1.5-2.5. Not spectacular, but a significant improvement.

Homes built after 1985 often already have cavity insulation. Pre-1920 homes typically have solid walls without a cavity -- requiring internal or external wall insulation, which is more expensive and complex.

4. What type of glazing do you have?

Single glazing: replace it. Double glazing from before 2000: upgrade to HR++ or triple glass for major savings. HR++ or newer: fine as is.

The difference is dramatic. Single glazing has a U-value of 5.8 W/m2K. HR++ achieves 1.1 W/m2K. That is five times better insulated. In homes with extensive window areas (bay windows, conservatories), glazing choice makes an enormous difference.

5. Do you have underfloor heating or radiators?

Underfloor heating: perfect. The low supply temperature of 35-40 degrees Celsius that a heat pump delivers is exactly what underfloor heating needs.

Radiators: it depends on the type. Old cast iron radiators designed for 90-degree water are not suitable as-is. Modern convector radiators or low-temperature (LT) radiators that work at 45-55 degrees are fine.

Need to replace radiators? Budget 200-500 euros per unit, installed. For an average home with 8 radiators: 1,600-4,000 euros.

6. What is the state of your electrical panel?

A heat pump draws 2,000-4,000 watts at peak. Combined with an induction hob, washing machine, and possibly an electric car, your current connection may be insufficient. Most existing Dutch homes have a 1x25A or 1x35A connection.

Need to upgrade to 3x25A? That costs approximately 300-600 euros and must be requested from your grid operator (Liander, Stedin, Enexis). Delivery time: 4-8 weeks.

7. Is there space for an outdoor unit?

A heat pump outdoor unit is roughly the size of an aircon condenser: 80 x 60 x 30 cm to 120 x 100 x 40 cm for larger models. It needs free airflow, should ideally not be placed against a neighbour's bedroom wall, and must not sit in an enclosed space where air circulation stagnates.

For apartments and homes without a garden, placement can be challenging. A flat roof is an option if the structure can bear the weight.

The right sequence: insulate first, heat pump second

This may be the single most important piece of advice in this entire guide. Getting the sequence right saves thousands of euros.

Why insulate first?

A well-insulated home needs less heating capacity. That means a smaller heat pump, which is cheaper to buy. A 5 kW unit costs 500-1,500 euros less than a 10 kW unit. Plus, a smaller heat pump in an insulated home runs more efficiently (higher SCOP), meaning lower electricity bills year after year.

The renovation sequence:

1. Roof insulation (RC 3.5+)
2. Wall insulation (RC 2.5+)
3. Floor insulation (RC 3.5+)
4. HR++ or triple glazing
5. Draught-proofing
6. Install heat pump
7. Solar panels (optional but recommended)

Reverse the order -- heat pump first, insulation later -- and you end up with an oversized heat pump that runs inefficiently after insulation. Constant start-stop cycling reduces its lifespan and wastes electricity.

Which heat pump for which house?

A quick decision guide based on home type and construction period.

Home type	Built	Est. energy label	Recommended type	Conditions
Terraced house	After 2000	A-B	All-electric (air-to-water)	Underfloor heating or LT radiators
Terraced house	1975-2000	C-D	Hybrid or all-electric after insulation	Insulate walls and roof
Terraced house	Before 1975	D-E	Hybrid	Cavity and roof insulation first
Corner house	After 2000	A-B	All-electric	Underfloor heating available
Corner house	Before 2000	C-E	Hybrid	Extra heat loss from exposed wall
Detached	After 2000	A-C	All-electric or ground source	Large capacity needed (8-14 kW)
Detached	Before 2000	C-F	Hybrid, or all-electric after deep renovation	High insulation costs, large surface area
Apartment	After 2000	A-B	Hybrid or air-to-air	Outdoor unit placement can be tricky
Apartment	Before 2000	C-E	Hybrid (if VvE approves)	VvE permission required
Listed building	Any	Varies	Hybrid (if permitted)	Internal insulation, monument permit needed

Common challenges and solutions

"My home is poorly insulated"

Not an excuse to do nothing, but a reason to take a phased approach. Start with the cheapest insulation measures (roof, cavity walls), then install a hybrid heat pump. That saves 50-70% on gas immediately, even in a moderately insulated home. In 5-10 years, as you continue insulating, you can upgrade to all-electric.

"I have old cast iron radiators"

Cast iron radiators have a large water volume and surface area -- which is actually an advantage for heat pumps (slow, steady heat release). The problem is temperature: they are designed for 70-90 degrees. At 45-50 degrees, they do not heat enough.

Solutions: install larger radiators (larger surface compensates for lower temperature), use LT radiators with built-in fans, or accept that in extreme cold the gas boiler kicks in -- which is exactly what hybrid heat pumps are designed for.

"I live in an apartment"

Tricky but not impossible. The outdoor unit can be placed on a balcony, flat roof, or facade. The VvE (homeowners' association) must give permission, and that is often the biggest hurdle. More VvE's are becoming open to heat pumps, but some still refuse over aesthetics or noise concerns.

An air-to-air heat pump (split unit) is sometimes the most feasible option for apartments. Cheap, compact, and easy to install. But no domestic hot water and no ISDE subsidy.

"My home is a listed building (monument)"

Listed buildings cannot be altered externally. That complicates outdoor unit placement and rules out external insulation. But it is possible. Internal insulation is an option (watch for moisture issues), and the outdoor unit can sometimes be placed on the roof or in a less visible position. A monument permit (monumentenvergunning) from the municipality is required.

"My gas consumption is extremely high"

Above 2,500 m3 per year? Your home is an energy sieve. A heat pump alone will not fix that. The approach:

1. Get a professional energy audit (100-300 euros, sometimes free through your municipality)
2. Roof and cavity wall insulation as first step
3. HR++ glazing
4. Hybrid heat pump
5. After 2-3 years, evaluate: has consumption dropped enough for all-electric?

This is a multi-year project. But each step delivers immediate savings.

Costs for a heat pump in an existing home

Costs are higher than in a new-build because modifications are almost always needed. A realistic budget:

Cost item	Hybrid scenario	All-electric scenario
Heat pump + installation	4,000 - 8,000	6,500 - 13,000
Insulation upgrades	3,000 - 8,000	8,000 - 20,000
Heating system modifications	0 (existing ok)	2,000 - 8,000
Electrical panel upgrade	0 - 600	300 - 600
ISDE subsidy	-2,500 to -3,500	-3,000 to -4,500
Total net	4,500 - 13,100	13,800 - 37,100

These numbers show why the hybrid heat pump is so popular in existing homes. The all-electric route is financially viable only when the home is already well-insulated and has underfloor heating.

For detailed pricing, see our complete heat pump cost guide.

Key takeaways

• A heat pump fits virtually any existing home, but the type must match the insulation level.
• Insulate first, heat pump second. This sequence saves thousands of euros.
• Energy label D or lower: choose hybrid. Label B or better: all-electric is realistic.
• Electrical panel, heating distribution system, and outdoor unit space are practical items to check in advance.
• A hybrid heat pump in an existing home costs 4,500-13,000 euros net including basic insulation.

Frequently asked questions

Is my house suitable for a heat pump?

Almost certainly yes -- but the type differs. Suitability depends on your insulation level, heating distribution system (radiators or underfloor heating), and energy label. A hybrid heat pump works in nearly any home. All-electric requires energy label B or better.

Can I install a heat pump without underfloor heating?

Yes. A hybrid heat pump works fine with existing radiators. An all-electric heat pump can also work with radiators, provided you use low-temperature or oversized conventional radiators. Or you can install underfloor heating during a major renovation.

How much does insulation cost before I can install a heat pump?

It varies widely by home. Basic insulation (roof + cavity walls + floor) costs 3,000-8,000 euros for an average terraced house. A comprehensive insulation package including HR++ glazing and draught-proofing can reach 15,000-25,000 euros. Many insulation measures also qualify for ISDE subsidy.

What if my VvE does not allow a heat pump?

Start a conversation. Prepare a plan addressing noise, aesthetics, and placement. An alternative for apartments is a collective heat pump system for the entire building, which can be more attractive both financially and in terms of resident support.

Should I wait for district heating (stadsverwarming)?

If your neighbourhood is scheduled for a heat network, check the timeline with your municipality. In many cases, it takes 5-10 years before a heat network becomes operational. A hybrid heat pump is an excellent interim solution -- you save on gas immediately and the investment is recovered well before the district heating switch.

Get your home assessed by an installer

The best way to know if your home is suitable: have a certified installer visit for an assessment. On warmtepompkiezen.nl, you will find installers across all 12 provinces who perform home assessments at low or no cost.

Find an installer near you

Related articles

• Hybrid vs all-electric heat pump: how to choose
• What does a heat pump cost in the Netherlands in 2026?
• Finding a certified heat pump installer in the Netherlands