Heat pump installation cost in 2026 (UK price guide)
Most UK homeowners fitting an air source heat pump in 2026 pay between £7,000 and £15,000 before any grant, with the majority of three and four-bedroom installations landing around £10,000 to £13,000. Ground source systems cost considerably more. This guide breaks down where every pound goes, and which parts of the quote you can actually influence.
- Air source: £7,000–£15,000 installed, before grant
- Ground source: £20,000–£35,000 installed
- Biggest variable: radiators and hot water storage, not the heat pump
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Heat pump installation cost by property size
Heat pumps are sized to a property's heat loss, not its floor area, so two identical-looking houses can need very different systems. The figures below are typical fully installed 2026 prices before any government grant is deducted.
| Property | Typical output | Air source installed cost |
|---|---|---|
| Flat or small 2-bed, well insulated | 4 – 5kW | £7,000 – £9,500 |
| 3-bed semi, reasonable insulation | 5 – 8kW | £9,000 – £12,500 |
| 4-bed detached | 8 – 12kW | £11,000 – £15,000 |
| Large or period property | 12 – 16kW+ | £14,000 – £20,000 |
| Ground source (borehole or slinky) | Any | £20,000 – £35,000 |
A poorly insulated house is the expensive one
Heat loss drives everything. An uninsulated four-bedroom home may need a 16kW unit and most of its radiators replaced; the same house with loft and cavity insulation done first might need 10kW and only three radiators changed. Insulation is almost always the cheaper kilowatt.
What is actually in the price
The heat pump itself is usually less than half the bill. Here is how a typical £12,000 air source installation breaks down.
| Element | Typical 2026 cost | Notes |
|---|---|---|
| Heat pump unit | £3,500 – £7,000 | Varies by output and brand |
| Hot water cylinder | £1,000 – £2,000 | Heat pumps need a larger, well-insulated cylinder |
| Radiator upgrades | £150 – £400 each | Often 3 to 8 radiators; underfloor is ideal but costlier |
| Pipework, buffer or volumiser | £500 – £1,500 | Some pipe runs need upsizing |
| Electrical works | £400 – £1,200 | Dedicated circuit, isolation, occasionally a supply upgrade |
| Base, brackets and groundworks | £300 – £900 | Concrete or composite base for the outdoor unit |
| Controls and smart thermostat | £250 – £700 | Weather compensation is worth having |
| Design, commissioning and MCS paperwork | £500 – £1,200 | Includes the heat loss survey and certification |
Ground source: why the jump in price
A ground source heat pump is more efficient over a year because ground temperature is far more stable than air temperature. The catch is the ground loop. Boreholes typically run to £8,000–£18,000 of the total on their own, and horizontal “slinky” loops need a large area of garden that will be dug up. Ground source makes financial sense on larger rural properties, on shared systems, and where there is no gas connection — rarely on a small suburban plot.
Grants and what they do to the figure
A government grant is available in the UK towards the cost of replacing a fossil-fuel heating system with a heat pump, subject to eligibility and to the work being carried out by an MCS-certified installer. Scheme rules and values are reviewed periodically, so confirm the current amount and your property's eligibility with your installer rather than relying on a figure quoted online.
Two practical points. First, ask every installer to show the price before grant, the grant, and the price after grant on separate lines — otherwise the quotes are not comparable. Second, the grant is normally claimed by the installer and passed on as a deduction, so you should not need to fund it up front.
Running costs versus a gas boiler
A well-designed heat pump running at a low flow temperature will typically deliver around three to four units of heat per unit of electricity across a year. Whether that beats a gas boiler on cost depends on the ratio between electricity and gas prices at the time, and on how well the system is designed. A badly designed heat pump running at a high flow temperature can cost more to run than the boiler it replaced — which is why the design flow temperature in your quote matters more than the brand on the box.
- Design flow temperature of 45°C or below is a good sign
- Weather compensation controls make a measurable difference
- Larger radiators let the system run cooler and cheaper
- A time-of-use electricity tariff can improve the economics further
Seven ways to reduce the cost
- Insulate first. Loft, cavity and draught-proofing reduce the required output and the radiator work.
- Book outside peak season. Spring and late summer are quieter than the September to December rush.
- Keep the existing cylinder if it genuinely suits. Have the installer confirm the coil area, not just the volume.
- Upsize only the radiators that need it. A room-by-room schedule shows which ones actually undersize at the design temperature.
- Combine with other works. If you are already having floors up, underfloor heating gets much cheaper.
- Get three itemised quotes and compare the line items rather than the totals.
- Confirm grant eligibility early so it is not a late surprise either way.
Hidden costs to check for
The gaps between a cheap quote and a complete one are predictable. Watch for an excluded cylinder, radiators listed as “if required”, an electrical supply upgrade that has not been assessed, scaffolding for a first-floor cylinder swap, making good after pipework, and removal and disposal of the old boiler and tanks. Ask for each of these to be priced or explicitly excluded in writing.
If you are still weighing up installers, our guide to choosing a heat pump installer in the UK covers the accreditations and questions that matter.
FAQs: heat pump installation cost (UK, 2026)
How much does a heat pump cost to install in 2026?
Most UK air source heat pump installations cost between 7,000 pounds and 15,000 pounds before any grant, with a typical three or four-bedroom house landing around 10,000 pounds to 13,000 pounds. Ground source systems usually cost 20,000 pounds to 35,000 pounds because of the ground loop works.
Why is a ground source heat pump so much more expensive?
The ground loop is the reason. Boreholes alone often account for 8,000 pounds to 18,000 pounds of the total, and horizontal loops require a large area of garden to be excavated. The heat pump itself is not dramatically more expensive than an air source unit.
Is there a grant towards heat pump installation?
Yes. A government grant is available towards the cost of replacing a fossil-fuel heating system with a heat pump, subject to eligibility and to using an MCS-certified installer. Ask your installer to confirm the current amount and whether your property qualifies, and to show the price before and after the grant separately.
Do I have to replace all my radiators?
Usually not all of them. A room-by-room heat loss survey identifies which radiators are undersized at the design flow temperature, and it is common for only three to eight to need upgrading at 150 pounds to 400 pounds each fitted.
Will a heat pump be cheaper to run than my gas boiler?
It depends on the design and on the gap between electricity and gas prices. A system designed to run at a flow temperature of 45 degrees or below, with weather compensation and correctly sized radiators, gives you the best chance of lower bills. A system running hot can cost more to run than the boiler it replaced.
Get real prices for your property
Every house has a different heat loss figure. The only way to know your number is a proper survey and a couple of itemised quotes.