Heat Pump Cost Calculator UK | Installed Price After Grant

How to use the heat pump cost calculator

Choose the Type of heat pump: air source (air-to-water), ground source, or air-to-air (room units, no radiators).
For an air source heat pump, pick your Size of home: 2-bed semi or terrace, 3-bed semi, 4-bed detached or 5-bed house.
Tick Needs a new hot water cylinder if you have no suitable one (for example you have a combi boiler today), and enter how many Radiators to upgrade. Your installer will advise on both.
Tick Heated by oil or LPG (no mains gas) if that is your fuel today. Off-gas homes get a bigger grant.
Pick your region under Where do you live? The grant depends on where you live, and installation prices are adjusted for your region.
Tap Add to shopping list to keep the result, or Share link to send it to an installer.

Why use this calculator

It shows the price before and after the grant, and the grant is worked out from your answers. It differs for England and Wales, Scotland and Northern Ireland, for off-gas homes and for air-to-air units.

It adds the extras that catch people out: a hot water cylinder and bigger radiators. These are priced as separate lines, not hidden in one figure.

It is not tied to one installer or brand. The prices come from published UK cost guides and the grant amounts from GOV.UK.

How we worked it out

Your numbers, step by step. This updates as you change the calculator.

Using UK average prices, so no regional adjustment.
An air source heat pump for a 3-bed semi, installed: £9,500 – £18,000 (typical £13,000) (a 3-bed semi is about 100% of the 3-bed semi price).
Cost before grant = £9,500 – £18,000 (typical £13,000)
Boiler Upgrade Scheme grant: £7,500 (taken off the price by your MCS installer).
Cost after grant = £9,500 – £18,000 (typical £13,000) minus £7,500 = £2,000 – £10,500 (typical £5,500)

How we estimate the cost

We use low, typical and high prices from published UK cost guides and the grant amounts from GOV.UK.

Installed price: the range for your heat pump type. For an air source heat pump we scale the 3-bed semi price by home size, using a guide’s price for each size: a 2-bed is about 81% of the 3-bed semi price, a 4-bed about 115% and a 5-bed about 131%.
Extras: a new hot water cylinder, and each radiator you upgrade × the price per radiator. Air-to-air units use neither.
Region: installation prices are multiplied by a regional factor. London is 1.25, the South East 1.15, the North 0.92, Scotland 0.93, Wales 0.92 and Northern Ireland 0.88. The grant is not adjusted. These factors are our own estimates, not an official index.
Cost before grant: the installed price plus extras.
Grant: taken off to give the cost after grant, never below zero.

What’s included

Installed price before grant, UK average:

Type	Low	Typical	High
Air source (3-bed semi)	£9,500	£13,000	£18,000
Ground source, including ground loop	£16,000	£25,000	£38,000
Air-to-air	£2,000	£3,000	£8,000

Extras:

Hot water cylinder, supplied and fitted: £800 to £1,500, typically £1,150.
Larger radiator: £150 to £300 each, typically £225.

Grants (one per property, taken off the price by an MCS installer):

England and Wales, air or ground source: £7,500.
England and Wales, off-gas home heated by oil or LPG: £9,000. This higher amount is time-limited, to 31 March 2027 at the time of writing.
England and Wales, air-to-air: £2,500.
Scotland: Home Energy Scotland, with a grant of up to £7,500 plus a loan. Check you qualify. We take off £7,500 for air source and ground source, and none for air-to-air.
Northern Ireland: not covered by the Boiler Upgrade Scheme, so no grant is taken off.

Zero-rated VAT on installing a heat pump is also time-limited, until 31 March 2027 (GOV.UK). We do not add VAT to the prices. To see who qualifies for the grant, check the GOV.UK Boiler Upgrade Scheme page.

Not included: pipework and groundworks beyond a standard installation, underfloor heating, and running costs.

What changes the price

Type. Air source is the usual choice. Ground source costs more because of the ground loop, and air-to-air is the cheapest.
Size of the home. Bigger homes need a bigger heat pump.
Cylinder and radiators. Many homes need a new cylinder and some bigger radiators.
Fuel today. Oil and LPG homes with no mains gas get a bigger grant for a limited time.
Where you live. Installation costs more in London and the South East, and the grant depends on the country.
Sources disagree. Ground source prices vary a lot between guides. We show the range from real installation data, which is higher than the Energy Saving Trust figure.
Dates. The off-gas grant and zero VAT both end in March 2027 unless extended, so check before you decide.

Tips

Get at least three quotes from MCS-certified installers, and compare them with the quote checker. The Boiler Upgrade Scheme grant is taken off the price by your installer.
Ask the installer whether you need a new cylinder or bigger radiators. A heat pump runs cooler than a boiler, so some radiators may need to be larger.
Time matters. The higher grant for oil and LPG homes and the zero VAT rate both run to March 2027 at the time of writing, so check the current rules before you decide.
Planning permission for the outdoor unit depends on your home and your council. Ask your installer and your council.
Check what you could save as well as what you pay. Use the energy upgrade payback tool and the BTU calculator to size up the job.

FAQs

How much does an air source heat pump cost to install?

About £9,500 to £18,000 before any grant, typically around £13,000 for a 3-bed semi. A 2-bed home is nearer £7,700 to £14,500 and a 4-bed detached £11,000 to £20,800. Cylinder and radiators are extra.

How much is the Boiler Upgrade Scheme grant?

£7,500 for an air or ground source heat pump in England and Wales, £9,000 for homes heated by oil or LPG with no mains gas, and £2,500 for air-to-air heat pumps. There is one grant per property, taken off the price by an MCS installer.

How much does a heat pump cost after the grant?

For a 3-bed semi with an air source heat pump, about £2,000 to £10,500 after the £7,500 grant, typically around £5,500. Add a cylinder (about £800 to £1,500) and any bigger radiators (about £150 to £300 each).

How much does a ground source heat pump cost?

About £16,000 to £38,000 before the grant, typically £25,000, including the ground loop. Sources disagree, and the Energy Saving Trust figure is lower than the installation data we use.

Do I need a new cylinder or radiators with a heat pump?

Often, but it depends on your home. A new hot water cylinder costs about £800 to £1,500, and each larger radiator about £150 to £300. Your installer will advise after looking at your house.

Is there VAT on a heat pump?

Installing a heat pump is zero-rated for VAT until 31 March 2027, according to GOV.UK. Supply-only purchases stay at the standard rate. Check the rules at the time you order.

Is there a grant for heat pumps in Scotland or Northern Ireland?

Scotland has its own scheme, Home Energy Scotland, with a grant of up to £7,500 plus a loan. The Boiler Upgrade Scheme covers England and Wales only, so the calculator takes off no grant for Northern Ireland.