greenhomesums
UK energy grant calculators
Boiler Upgrade Scheme, ECO4, and grant-offset models for heat pumps, insulation and whole-home retrofits.
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Heat Pump vs Gas Boiler Calculator UK
Compare the running cost, 15-year total cost of ownership, and CO₂ impact of an air-source heat pump versus keeping a gas boiler. Uses the current Ofgem price cap and the UK Boiler Upgrade Scheme grant.
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Boiler Upgrade Scheme Grant Calculator UK
Check if you qualify for the UK Boiler Upgrade Scheme £7,500 grant for a heat pump — or £5,000 for a biomass boiler — and see your net install cost. Updated for 2026 rules.
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MEES Landlord Compliance Calculator UK
UK landlords: check whether your rental property meets the Minimum Energy Efficiency Standards (EPC C by 2028 / 2030), see the cheapest measure stack to close the gap, and model grants and penalty exposure.
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EPC Band Upgrade Cost Calculator UK
Homeowner calculator: work out what it would cost to lift your property's EPC from its current band to C, B or A — with the cheapest measure stack, grant offsets, resale-value uplift and green-mortgage savings.