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EPC Calculator & Rating Estimator

Use our free EPC calculator to estimate your energy rating and find out which home improvements could boost your EPC score. Pick your current band, tell us about your home, and we will show you the best upgrades ranked by cost, savings, and payback period.

Real-time EPC projectionCost and payback estimatesGrant eligibility notesNo email required
Homeowner reviewing an EPC energy performance certificate in a UK kitchen

Landlords: The UK Government has proposed that all rental properties must reach EPC Band C by 2028 for new tenancies. If your property is currently rated D or below, now is the time to plan your upgrades and take advantage of available grants.

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How this calculator works

Our EPC calculator shows you which home upgrades could boost your Energy Performance Certificate rating and by how much. You enter your current EPC band, property type, age, and existing features (insulation, heating, glazing), and the tool identifies the improvements that would have the biggest impact on your EPC score.

Each improvement is shown with its estimated EPC point gain, installation cost, annual energy savings, and payback period. The tool also highlights which upgrades may qualify for government grants under schemes like ECO4 or the BUS grant. A live EPC projection updates as you select improvements, so you can see the cumulative effect on your rating.

EPC ratings are calculated using the Standard Assessment Procedure (SAP), which considers dozens of factors. Our EPC cost calculator estimates are based on typical point improvements published by DESNZ and the Energy Saving Trust, but actual results depend on a full assessment by a qualified Domestic Energy Assessor. This tool gives you a useful starting point for planning, not a guaranteed outcome.

Frequently asked questions

What is an EPC rating and why does it matter?
An Energy Performance Certificate (EPC) rates your home's energy efficiency from A (most efficient) to G (least efficient). It affects your energy bills, your property's value, and whether you can legally rent it out. Homes with better ratings are cheaper to heat and more attractive to buyers.
What is the average EPC rating in the UK?
The average UK home has an EPC rating of Band D, with a score around 60 out of 100. Around 40% of English homes are rated D, with another 30% at C. Only about 4% of homes currently achieve an A or B rating.
What EPC rating do landlords need by 2028?
The UK Government has proposed that all rented properties must reach EPC Band C or above by 2028 for new tenancies (and 2030 for existing ones). Landlords who fail to comply could face fines of up to £30,000. If your rental property is currently rated D or below, it is worth planning improvements now.
What home improvements give the biggest EPC boost?
The biggest EPC gains typically come from insulation (cavity wall can add 10 to 15 points), replacing an old boiler with a condensing model (8 to 15 points), and installing a heat pump (15 to 30 points). Solar panels also add 10 to 15 points. The most cost-effective starting point is usually loft insulation or a hot water cylinder jacket.
How much does it cost to improve your EPC rating by one band?
Moving up one EPC band typically costs between £1,000 and £10,000 depending on your starting point and property type. Going from D to C might cost £1,500 to £5,000 with insulation and heating upgrades. Going from E to D could be as little as £500 to £1,500 with basic insulation. Each property is different, so get a proper assessment first.

How this estimator works

Our estimates are based on typical EPC point improvements published by the Energy Saving Trust, BEIS (now DESNZ), and the official EPC register. We adjust costs for your property type. Actual EPC results depend on a full assessment by a qualified Domestic Energy Assessor, who will consider your property's construction, age, orientation, and existing installations. This tool gives you a useful starting point, but it is not a substitute for a proper EPC survey.

Our methodology|Last updated: April 2026

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