Is My Home Suitable for a Heat Pump? UK Checklist (2026)
Most UK homes can have a heat pump — but they work best in well-insulated properties with adequate space for the outdoor unit and a suitably sized heating distribution system. This checklist helps you assess your home's readiness and understand what improvements, if any, might be needed before installation.
Suitability checklist
Heat pumps work most efficiently in well-insulated homes (EPC C or above). They can work in less-insulated properties but may require a larger system and have higher running costs. Adding loft and cavity wall insulation before a heat pump often improves both comfort and running cost economics.
Heat pumps deliver lower-temperature water (40–50°C) than gas boilers (60–80°C). Existing radiators may need to be larger to deliver the same heat output at lower temperature. An installer will calculate the required radiator size for each room. Underfloor heating is ideal for heat pumps — it works best at low temperatures.
An air-source heat pump (ASHP) needs an outdoor unit roughly the size of an air conditioning unit (600–900mm wide). It needs clearance from walls and fences (typically 200mm sides, 1m front). Most gardens — including small urban terraced house rear gardens — can accommodate one. The unit produces some noise (~40–55 dB at 1m) and should be sited away from bedrooms where practical.
Detached and semi-detached properties are easiest to retrofit with a heat pump. Terraced houses can also be suitable — particularly end-of-terrace. Flats are more complex (shared heating plant, stacked property boundaries). Purpose-built new builds often have heat pumps already.
Oil and LPG-heated homes are the strongest candidates — the BUS grant (£7,500) and running cost savings are most compelling. Gas-heated homes can still switch: the economics are tighter at current prices but improve as gas and electricity price ratios normalise, and future-proofing against the 2035 boiler phase-out adds value.
Heat pumps typically require a hot water cylinder to store domestic hot water (unlike combi boilers that heat on demand). If your home currently has a combi boiler and no cylinder, space will be needed — typically a cupboard for an 200–250 litre tank. This is a key installation consideration in small properties.
Most ASHP installations are permitted development in England, Wales and Scotland — no planning permission needed. Exceptions: listed buildings, some conservation areas, installations with units that exceed 0.6m³ volume or 42dB(A) noise. Scotland has slightly different rules. An installer will advise on your specific property.
This checklist is a starting point — an MCS-certified installer survey gives the most accurate picture for your specific property.
What is a heat loss calculation?
A heat loss calculation (formally a BS EN 12831 calculation) is the key technical step in heat pump design. An MCS-certified installer calculates the maximum heat that escapes from your home on the coldest design day (typically -2°C to -5°C in the UK), room by room.
This tells them what capacity heat pump you need, and whether existing radiators are large enough to deliver that heat at heat-pump temperatures (40–50°C flow temperature). If radiators are undersized, the installer will specify replacements. A good installer will never skip this step — it's the foundation of a correctly sized and efficient system.
Does my insulation need to be perfect?
No — heat pumps can be installed in homes with moderate insulation, not just EPC A or B properties. However, better insulation reduces the size (and cost) of heat pump needed and improves running efficiency. The Boiler Upgrade Scheme can be combined with insulation grants (ECO4, GBIS) so that improving insulation and installing a heat pump happen together. An installer survey will give you a clear view of whether insulation upgrades are needed before or alongside the heat pump for your specific home.
The Boiler Upgrade Scheme — £7,500 off
The Boiler Upgrade Scheme (BUS) gives up to £7,500 off the installed cost of an air-source heat pump in England and Wales. The grant is claimed by your MCS-certified installer and deducted from your quote — you never handle the money. For a typical ASHP costing £10,000–£15,000 installed, the BUS reduces the effective net cost to £2,500–£7,500. The grant can be combined with insulation improvements and is available for replacing gas, oil, LPG or electric heating.
Common questions
Will a heat pump work in my old Victorian terraced house?
Victorian terraces can have heat pumps, but they're more challenging than detached homes. Solid walls (common in pre-1920 properties) mean higher heat loss, requiring a larger heat pump and likely larger radiators. The combination of adding external or internal wall insulation plus a heat pump can work well — and ECO4 may fund the insulation element. An installer survey is the best way to assess your specific property.
How much does a heat pump cost after the BUS grant?
A typical air-source heat pump costs £8,000–£15,000 installed before the grant. After the £7,500 Boiler Upgrade Scheme grant, the net cost is typically £500–£7,500 — comparable to a mid-range gas boiler system. The grant is available to homes in England and Wales replacing any existing heating system with an MCS-certified ASHP.
My house has small radiators — do they all need to be replaced?
Not necessarily all of them. An installer does a heat loss calculation room by room and identifies which radiators are undersized for heat-pump temperatures. In many homes, only 30–50% of radiators need upgrading. Larger rooms with heavy use (kitchen-diner, living room) are most likely to need bigger radiators; bedrooms often only need modest heat.
Can I have a heat pump and keep my gas boiler as a backup?
Yes — hybrid heat pump systems pair an air-source heat pump with an existing gas boiler. The heat pump handles most of the heating; the boiler tops up in the coldest weather. Hybrid systems typically use 50–70% less gas than a boiler-only system and are available under the BUS grant (lower grant amount: £5,000). They're particularly attractive in poorly insulated homes where a full heat pump might struggle.
How noisy is a heat pump?
A modern ASHP is typically 40–50 dB(A) at 1m — similar to a quiet refrigerator or air conditioning unit. There are MCS noise and siting standards installers must follow. Most neighbours find them perfectly acceptable. Ground-source heat pumps have an outdoor borehole pump that is quieter still. If noise is a concern, your installer can model siting options to minimise impact.
Get a free survey from an MCS-certified installer
The best way to confirm suitability for your property — no cost, no obligation.
Find local installers
Compare quotes from MCS-certified installers near you.