Air Source Heat Pump Installation Cost Calculator

How this calculator works

This calculator works in ranges rather than single figures, because real quotes, yields and tariffs genuinely vary that much. It starts from typical UK price, output and savings ranges drawn from published 2026 industry guides and official scheme documentation, then scales them by the quantities you enter and adjusts them for each choice you make below. The result is a low-to-high band that a realistic outcome is likely to fall within, not a promise of the figure you will achieve.

An air source heat pump costs to fully installed before grants in 2026, with the official Ofgem average across real Boiler Upgrade Scheme installations at for an 8 kW unit. After the grant, most homeowners pay to , and the whole job carries 0 percent VAT until March 2027. A typical installation takes two to five days and includes the outdoor unit, a hot water cylinder, controls and commissioning.

Heat pump size

Heat pumps are sized in kilowatts of heat output, matched to your home’s heat loss rather than its floor area alone: a well insulated three bedroom home might need only 5 kW while a poorly insulated one needs 7.5 kW or more, and the official average UK installation is an 8 kW unit. Larger units cost more, but not proportionally, because design, labour and commissioning costs are similar at any size. An MCS installer must carry out a room-by-room heat loss calculation before quoting, which is the number that actually fixes the size.

Radiators and pipework

Heat pumps deliver water at around 45 to 55 degrees Celsius rather than the 70 to 80 degrees of a gas boiler, so radiators may need to be larger to shift the same heat into each room. Many homes need only a handful of radiators upsized, typically adding to , while a full emitter upgrade or underfloor heating can add several thousand pounds. The installer’s heat loss survey identifies exactly which rooms are affected, and it is worth insisting the quote itemises this.

Where you live

Installation labour is not priced uniformly across the UK, with published guides putting London and South East quotes roughly 15 to 25 percent above the national average. Hardware prices are broadly national, so the difference sits mostly in labour, access and overheads.

Boiler Upgrade Scheme grant

The Boiler Upgrade Scheme pays towards an eligible air source or ground source heat pump replacing a fossil fuel system in England and Wales, with the scheme extended to 2030. Your MCS-certified installer applies on your behalf and deducts the grant from the invoice, so you only ever pay the net amount. Scotland runs a parallel Home Energy Scotland scheme with grants up to , or in rural and island areas, plus optional interest-free loans, and eligible low income households may qualify for fully funded installations under ECO4.

What else affects the figures

The unit itself is to with cylinders, valves, controls and fittings adding to , so the specification behind a quote matters as much as the headline. Older properties with pipework changes, cylinder relocation or radiator upsizing sit towards the top of the range, and a home needing a full emitter upgrade can add several thousand pounds. Running costs land at roughly to a year for a typical home on a standard tariff, or to on a dedicated heat pump time-of-use tariff, and modern units keep working to minus 15 degrees Celsius and beyond, with annual servicing at to keeping the 15 to 20 year lifespan on track.

Certification, planning and grid connection

Most air source heat pump installations fall under permitted development in England, provided the unit meets size and siting rules and the MCS 020 noise assessment, which requires no more than 42 decibels at the nearest neighbouring window, a point worth early attention in terraced housing; listed buildings and conservation areas need planning advice. Use an MCS-certified installer: certification is a condition of the Boiler Upgrade Scheme grant, and the installer applies for the grant and deducts it from your invoice. Residential heat pump installations carry 0 percent VAT until March 2027, and your installer handles building regulations notification and any electrical supply checks as part of the job.