Guide · Costs
Air source heat pump cost in the UK
A 2026 breakdown of real install prices, the £7,500 grant and what actually swings the final quote.
A typical air source heat pump costs £8,000–£14,000 fully installed in the UK in 2026. After the £7,500 Boiler Upgrade Scheme grant in England and Wales, most households pay £500–£6,500 out of pocket. Larger 12–16 kW systems for 4-bed detached homes can reach £16,000.
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Cost breakdown by property size
Heat pump sizing is driven by your home's heat loss, not its floor area — but as a rule of thumb:
- 1–2 bed flat or small terrace (5–7 kW): £8,000–£10,500 installed.
- 3-bed semi (7–9 kW): £9,500–£12,500 installed.
- 4-bed detached (10–14 kW): £12,000–£16,000 installed.
- 5+ bed or poorly insulated (14–18 kW): £14,000–£18,000+, often with cascade systems.
What you're actually paying for
A typical £11,000 quote roughly breaks down as: outdoor unit £3,000–£4,500, hot water cylinder £900–£1,400, labour and pipework £2,500–£3,500, controls and electrics £600–£900, and the heat loss survey plus MCS paperwork £400–£600.
Premium brands (Vaillant, Viessmann, Mitsubishi) add roughly £800–£1,500 over budget brands like Grant or Samsung.
Hidden extras most quotes miss
Watch for these line items — they routinely add £1,500–£5,000 if not flagged early:
- Radiator uprates (1–4 radiators at £150–£400 each).
- Cavity, loft or underfloor insulation top-ups to hit the required heat loss.
- Three-phase electrical supply upgrade — uncommon but ~£1,500 if needed.
- Acoustic enclosure for boundary clearance.
After the £7,500 grant
The Boiler Upgrade Scheme runs in England and Wales until 2028 and is paid to the installer, not you. Scottish homeowners get an equivalent £7,500 grant plus a £7,500 interest-free loan via Home Energy Scotland. Northern Ireland has no national grant scheme as of 2026.
Frequently asked questions
- How much does an air source heat pump cost installed in the UK?
- A 7–12 kW air source heat pump costs £8,000–£14,000 fully installed in 2026, falling to £500–£6,500 after the £7,500 Boiler Upgrade Scheme grant in England and Wales.
- What's included in a typical install quote?
- The unit itself, hot water cylinder, controls, pipework, electrical works, commissioning, MCS certification and the heat loss survey. Radiator upgrades and extra insulation are usually quoted separately.
- Why do quotes vary so much between installers?
- The biggest swings come from kW sizing (a 12 kW unit costs ~£1,800 more than a 7 kW), brand choice, cylinder size, the length of pipework runs, and how many radiators need uprating to work at lower flow temperatures.
- Is the £7,500 grant subtracted from the quoted price?
- Yes — MCS-certified installers apply for the BUS grant on your behalf and discount it directly from the invoice. You never handle the cash.
- Energy Saving Trust — Heat pump efficiency, running cost and SCOP benchmarks (UK).
- Boiler Upgrade Scheme — GOV.UK — Official guidance on the £7,500 BUS grant in England and Wales.
- MCS Certified — Installer certification scheme required for grant eligibility.
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