Ground 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.

A ground source heat pump costs roughly to fully installed before grants in 2026, with the official average around , falling to to after the Boiler Upgrade Scheme grant. The premium over air source buys the groundworks: once buried, the collector lasts 50 years or more, and the stable ground temperature delivers seasonal efficiencies of 380 to 450 percent against roughly 280 to 400 percent for air source, with no outdoor fan unit at all.

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.

Ground collector type

Horizontal collectors lay pipe loops in trenches about a metre deep, the cheaper option but needing substantial garden area, roughly two to three times the home’s floor area. Vertical boreholes drill 60 to 200 metres down instead, suiting compact plots and delivering slightly more stable temperatures, but the drilling rig typically adds 25 to 40 percent to the project. Ground conditions matter for both, which is why a site survey precedes any firm quote.

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

Groundworks dominate the price and its uncertainty: trench digging is weather and access dependent, borehole drilling is priced per metre and varies with geology, and reinstating the garden afterwards is a real cost worth confirming in the quote. Running costs are the lowest of any whole-house system, typically to a year for an average home, and maintenance is minimal since the moving parts sit indoors. The honest caveat is that for most UK homes the extra capital rarely pays back against a well installed air source unit within its lifetime, so ground source makes most sense for larger properties, high heat demands, new builds and rural plots where the groundworks are cheap and the efficiency compounds.

Certification, planning and grid connection

Ground source heat pumps generally fall under permitted development for the heat pump itself, but the groundworks deserve early conversations: boreholes and large trench fields can involve environmental permitting depending on location and geology, and listed or conservation settings need planning advice. MCS certification is a condition of the 7,500 pound Boiler Upgrade Scheme grant, which applies to ground source exactly as to air source, and 0 percent VAT applies until March 2027. A ground conditions survey precedes any firm quote, and reinstatement of the garden or drive after trenching is worth confirming in writing.