GSHP Installer Margin Calculator 2025/26
Calculate ground source heat pump (GSHP) job profitability for UK installers. Enter unit cost, borehole or ground array costs, hot water cylinder, controls and labour to see total job cost, customer price before and after the £7,500 BUS grant, and your gross margin.
Key Inputs
- GSHP unit cost (trade price: £6,000–£12,000 depending on output)
- Borehole drilling cost (£1,000–£1,500 per metre; typically 80–150m depth)
- Horizontal ground array cost (alternative to borehole on suitable land)
- Hot water cylinder and buffer vessel costs
- Controls, pipework and ancillaries
- Labour days at day rate (£/day)
- BUS grant value (£7,500 for GSHP in 2025/26)
What You'll Get
- Total material cost (unit + borehole + ancillaries)
- Total labour cost
- Total installed cost
- Customer price before BUS grant
- Customer net price after £7,500 BUS grant
- Installer gross margin percentage
Important Notes — 2025/26 Rates & Caveats
Ground source heat pumps cost significantly more than air source due to borehole or ground array installation. A typical domestic GSHP installed cost in 2025/26 is £20,000–£35,000 before grant (versus £10,000–£18,000 for ASHP). Borehole drilling costs are the largest variable — typically £1,000–£1,500 per metre drilled by a specialist contractor. GSHP installers must be MCS-certified and typically hold a BPEC, City & Guilds 6336 or equivalent heat pump qualification. The BUS grant of £7,500 applies equally to GSHP and ASHP, but covers a smaller proportion of GSHP total cost.
Frequently Asked Questions
How much does a ground source heat pump cost to install in the UK?
A ground source heat pump (GSHP) installation in the UK typically costs £20,000–£35,000 in 2025/26 before grant, depending on borehole depth, system size and property heat demand. The BUS grant of £7,500 reduces this to £12,500–£27,500 for the customer. Horizontal ground arrays are cheaper than boreholes but require a larger garden area. GSHPs are generally more suitable for rural properties with higher heat demands and available land.
What qualifications do GSHP installers need?
GSHP installers in the UK must hold MCS certification to enable customers to access BUS grants and SEG tariffs. Relevant qualifications include BPEC Award in the Installation of Heat Pump Systems (Ground Source), City & Guilds 6336 Heat Pump Installation, or equivalent. F-gas certification is required for handling refrigerants. Borehole drilling is typically subcontracted to a specialist Ground Source Heat Pump Association (GSHPA) registered driller.
Is a ground source heat pump better than an air source heat pump?
GSHPs typically achieve higher Coefficient of Performance (CoP) — often 3.5–5.0 versus 2.5–4.0 for ASHPs — because the ground temperature is more stable than air temperature in winter. However, the much higher installation cost means payback periods are longer. GSHPs are best suited to properties with high heat demand, good insulation, underfloor heating and available land. ASHPs are more cost-effective for most UK domestic retrofits due to lower installed cost relative to the BUS grant value.
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