What Happens at an EPC Assessment?

An EPC assessment records features that affect a home's energy efficiency. It produces an energy rating and recommendations, not a structural opinion about defects or the property's value.

Before the visit

Make sure the assessor can access the property and relevant areas safely. If you have evidence of insulation or heating improvements that is not obvious on inspection, ask the assessor what documentation may be useful. Let them know about restricted access in advance.

During the assessment

The accredited domestic energy assessor records information about the building fabric, heating, glazing and other energy-related features. The exact time depends on the size and complexity of the home. It is a non-structural assessment, so it does not replace a buyer's home survey.

After the visit

The results are used to produce an EPC showing a current rating and possible improvements. When lodged, the certificate can be retrieved from the appropriate official register. Ask your provider when to expect the completed certificate before you set a marketing deadline.

Questions worth asking before the visit

Ask who will be attending, what parts of the home they need to access and whether evidence of completed energy improvements would help. Confirm that the quote covers a lodged domestic certificate and the expected date of delivery. If a room or service cupboard is inaccessible, tell the assessor early rather than discovering the problem during the appointment.

What should you prepare?

Have the address, property access and details of any recent energy improvements ready. If you have documentation for insulation or a new heating system, ask the assessor whether it is relevant. Make sure the assessor can inspect accessible parts of the home safely. You do not normally need to stage the property as you would for estate-agent photography, but missing access or information can limit what can be recorded.

What the assessor records

An accredited domestic energy assessor examines energy-related features, which can include construction, glazing, heating, hot water and insulation. They gather measurements and other property details to calculate the rating. The exact work and time on site depend on the home's layout and complexity, so treat advertised visit times as indicative rather than guaranteed.

What an EPC cannot tell you

An EPC is not a structural condition report and does not establish whether cracks, damp, drainage or the roof require repairs. It can recommend ways to improve energy efficiency, but a buyer who needs assurance about defects should consider the appropriate home survey separately. Similarly, the potential rating is an estimate of what may be achieved with stated improvements, not a promise about a renovation.

After the assessor leaves

The assessor prepares and lodges the certificate, which shows the current and potential rating alongside recommendations. Ask when it will be available and check the property's details once you receive it. If you are selling or letting, share it with the agent and keep a copy of the register link. An EPC is generally valid for 10 years, so the resulting certificate may serve more than one transaction.

Further reading and a quote

For related detail, read our guide to finding an EPC assessor. Check current official guidance and the existing-certificate register. If you need a new domestic assessment, request a tailored EPC quote.