Definition and purpose
An Energy Performance Certificate (EPC) is an official document that rates how energy efficient a property is on a scale from A (most efficient) to G (least efficient). It also provides estimated energy costs and carbon dioxide emissions.
EPCs help buyers, tenants and owners understand running costs and identify improvements. They are a legal requirement for most property marketing in England and Wales — not an optional survey.
The certificate is produced by a qualified domestic energy assessor after a site visit. It remains valid for ten years unless replaced by a newer certificate for the same property.
What appears on the certificate
The front page shows the current energy efficiency rating and an environmental impact rating. A typical certificate also includes a 'potential' rating — what the property could achieve if recommended measures were installed.
You will see a summary of key building elements: walls, roof, windows, heating, hot water and lighting. Recommendations may suggest loft insulation, boiler upgrades or draught proofing — these are advisory, not mandatory.
An EPC is not a structural survey, electrical check or gas safety certificate. It assesses energy performance only. Always commission the right professional for each requirement.
- Current and potential energy ratings (A–G)
- Estimated annual energy costs
- Summary of construction and heating features
- Recommended improvements with indicative savings
Who produces EPCs
Only accredited domestic energy assessors can produce EPCs for homes. Assessors must follow standard methodology so ratings are comparable between properties.
On EPCguys you compare independent local assessors — each business sets its own pricing and availability. Search your postcode to see who covers your district.
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