An air source heat pump costs a typical UK homeowner between £7,000 and £13,000 to install in 2026, which is £2,000 to £5,000 more than a new gas boiler but can cut annual heating bills by £200–£600.
If you are replacing a gas boiler, the upfront price of an air source heat pump is the first question you will ask. The short answer is that a full installation for a typical three-bedroom semi-detached house ranges from £8,500 to £13,000 before any government support, according to the Microgeneration Certification Scheme (MCS) Installation Database for the first quarter of 2026 (MCS, 2026). After the £7,500 Boiler Upgrade Scheme grant, your net cost drops to between £1,000 and £5,500, which is comparable to or slightly higher than a new gas boiler at £1,500 to £3,000.
The trade-off is that running costs are lower. The Energy Saving Trust estimates a typical gas-heated home switching to a heat pump saves £200 to £600 per year on heating bills at 2026 fuel prices (Energy Saving Trust, 2026). Over the system’s 15- to 20-year lifespan, those savings can offset the higher upfront cost.
The 2026 Boiler Upgrade Scheme Grant Cuts the Net Cost to You
The Boiler Upgrade Scheme (BUS) gives you a flat £7,500 grant for installing an air source heat pump in 2026. This is not a rebate you claim after paying the installer. It is applied as a discount at the point of sale by an MCS-certified installer, so you only pay the reduced amount (GOV.UK, 2026).
Here is a worked example. An installer quotes £10,000 for a complete system. They deduct the £7,500 grant from the invoice. You pay £2,500. The installer reclaims the £7,500 from the scheme administrator afterwards.
Eligibility has a key condition. Your property must have a valid Energy Performance Certificate (EPC) with no outstanding recommendations for loft or cavity wall insulation. If your EPC says you need 200mm loft insulation or cavity wall fill, you must install that first or the grant is refused (GOV.UK, 2026).
Real Installation Costs for a 3-Bed Semi-Detached House in 2026
The headline figure of £8,500 to £13,000 covers the full job, but you can break it down into three main parts. The heat pump unit and indoor cylinder or buffer tank account for £8,500 to £11,000 on average, based on MCS installation data for Q1 2026 (MCS, 2026). Electrical work, including a new circuit and isolator switch, adds £1,200 to £2,000. Removing the old boiler and tank costs £500 to £1,000 (Energy Saving Trust, 2026).
Regional labour rates cause variation. The Department for Energy Security and Net Zero (DESNZ) Heat Pump Ready programme analysis found that installations in the South East average £1,200 more than in the North East, driven by higher electrician and plumber rates (DESNZ, 2025-2026).
A “like-for-like” replacement that keeps your existing radiators and pipework costs less than a full system redesign. If your radiators are undersized for the lower flow temperature of a heat pump, you may need larger radiators or underfloor heating, which adds £1,000 to £3,000.
How Running Costs Compare to a Gas Boiler and Electric Heating
For a typical three-bed home with a 12,000 kWh annual heat demand, the running costs at 2026 energy prices are as follows. A heat pump with a Seasonal Coefficient of Performance (SCOP) of 3.0 operates at 300% efficiency, meaning it produces three units of heat for every unit of electricity. At the January 2026 Ofgem price cap rate of 24.5p/kWh for electricity, the annual cost is £550 to £700 (Ofgem, 2026). A gas boiler at 90% efficiency and 6.0p/kWh gas costs £850 to £1,000. Electric storage heaters cost £1,400 to £1,700.
Time-of-use electricity tariffs can cut heat pump running costs by 15 to 20%. Tariffs such as Octopus Cosy or EDF GoElectric offer cheaper rates during off-peak hours, which aligns well with heat pump operation (Energy Saving Trust, 2026).
Actual savings depend on your property’s insulation levels, radiator sizing, and how you set the thermostat. A poorly insulated home with small radiators will see smaller savings than a well-insulated home with oversized radiators.
Quick Numbers, Air Source Heat Pump Cost UK 2026
| Cost Item | Typical Range (GBP) | Source |
|---|---|---|
| Full system installation (no grant) | £8,500–£13,000 | MCS, 2026 (link) |
| Boiler Upgrade Scheme grant | -£7,500 | GOV.UK, 2026 (link) |
| Net cost to homeowner | £1,000–£5,500 | Calculated |
| Annual running cost vs. gas boiler | -£200 to -£600 savings | EST, 2026 (link) |
| Typical payback period (with grant) | 5–10 years | EST, 2026 (link) |
The Direct Answer What “Air Source Heat Pump Cost UK” Means for Your 2026 Decision
The average installed cost for a UK home in 2026 is £10,500 before the £7,500 grant, giving a net cost of £3,000. This figure comes from the MCS Installation Database for Q1 2026 and the current Boiler Upgrade Scheme grant value (MCS, 2026; GOV.UK, 2026).
This net cost is £1,000 to £2,000 more than a new gas boiler, but running costs are £200 to £600 lower per year. The break-even point is typically within 5 to 10 years. After that, you are saving money each year.
Your actual figure will vary by property size, heat demand, and installer. Always get three quotes from MCS-certified installers and compare them on total price, not just the grant-discounted amount.
how to compare heat pump quotes from different installers
How to Verify an Installer MCS Certification and TrustMark
MCS (Microgeneration Certification Scheme) certification is mandatory for the Boiler Upgrade Scheme grant. No MCS, no grant. You can check the MCS installer database online to confirm a company is certified (MCS, 2026; GOV.UK, 2026).
TrustMark registration is a secondary quality mark for workmanship and consumer protection. It is not required for the grant but adds a layer of reassurance if things go wrong (TrustMark, 2026).
Before signing a contract, ask the installer for proof of MCS certification, verify their public liability insurance, and check their complaints process. Gas Safe Register is irrelevant for heat pumps because they are not gas appliances, but the installer must be qualified for electrical work under Part P of the Building Regulations.
what to check in a heat pump installation contract
Frequently Asked Questions
A full installation for a typical three-bed semi costs £7,000 to £13,000 before grants, according to the MCS Installation Database for 2026. After the £7,500 Boiler Upgrade Scheme grant, your net cost is £1,000 to £5,500.
The Boiler Upgrade Scheme gives a flat £7,500 grant for air source heat pumps in 2026, applied as a discount by an MCS-certified installer at the point of sale (GOV.UK, 2026). You pay the reduced amount directly.
The Energy Saving Trust estimates savings of £200 to £600 per year on heating bills when switching from a gas boiler at 2026 fuel prices. Over 15-20 years, these savings can offset the higher upfront cost.
Yes, your property must have a valid EPC with no outstanding recommendations for loft or cavity wall insulation. If your EPC requires 200mm loft insulation or cavity wall fill, you must install it first (GOV.UK, 2026).
An air source heat pump costs £7,000-£13,000 upfront, which is £2,000-£5,000 more than a new gas boiler at £1,500-£3,000. After the BUS grant, the net cost is comparable or slightly higher.
