What Happens During an EPC Assessment?

Before the appointment

Tell the provider whether the property is an existing dwelling, a new build or commercial premises. The appropriate assessment method and accreditation depend on the work. Explain any conversion, extension or combination of residential and business accommodation before the booking is confirmed.

Agree who will provide access and tell tenants what the visit involves. For a flat, think about both the front door and any shared equipment or areas that may be relevant. For business premises, identify a person who can explain the layout and arrange access to building services.

What an assessor records in a home

The assessor gathers information about the building's dimensions, construction and energy-related features. This includes walls and roof, accessible insulation, windows, heating, hot water and fixed lighting. Evidence of different building ages or later additions can matter: an original house and a more recent extension should not automatically be treated as the same construction.

The inspection is used to create an energy model. It does not measure your personal energy habits or award extra points for a tidy room. Standard assumptions allow buildings to be compared even when one household heats its home differently from another.

Access that helps the visit

• Clear routes to rooms that need to be measured or inspected.
• Safe access to the loft hatch where relevant; discuss obstacles beforehand.
• Access to the boiler, hot-water cylinder and heating controls.
• Information about communal heating where it serves the home.
• The location of any installation records or other supporting evidence.

Do not move heavy equipment, enter an unsafe roof space or remove building materials to prepare. Tell the assessor about a limitation so they can explain what can be recorded and what evidence may be needed instead.

Documents worth gathering

Keep certificates, invoices and specifications for insulation or heating work together. Useful records identify the address, the installed product or construction and when the work was completed. Ask the assessor which evidence they can accept; a general statement that a previous owner “had everything insulated” may not establish the necessary details.

For an extension, plans and completion records can help explain changes to the building. Photographs may be useful alongside appropriate documentation, but acceptance depends on the assessment rules and what the evidence actually shows. Supplying documents does not guarantee a particular score.

How commercial visits differ

A non-domestic assessment can involve reviewing plans and inspecting different activity zones and services. Heating, cooling, ventilation and lighting may vary across the building. Tell us whether the enquiry concerns a whole building, a separate shop or office, or a unit with shared systems.

Ask the building manager to have relevant information available. If an area cannot be entered during trading hours, arrange a suitable appointment rather than leaving that restriction until the assessor arrives. Read when a commercial EPC is required if you are unsure about the transaction.

What happens after the visit?

The assessor checks the collected information, completes the calculation and lodges the certificate through the approved process. The site visit and delivery of the completed EPC are separate stages, so agree the expected timescale before booking. Missing evidence can require follow-up.

Read the completed certificate, including the address and property description. It includes recommendations as well as a rating. If something appears wrong, contact the assessor promptly and explain the particular item. Keep copies of the evidence you supplied so the issue can be investigated.

What an EPC does not replace

An EPC is not a structural survey, a boiler service or an electrical inspection. It should not be used to diagnose damp or to certify that an installation is safe. The recommendations are a starting point for investigating improvements, not a specification authorising a contractor to begin work.

If you plan a major retrofit, you may need a more detailed assessment of the building, ventilation, moisture and interactions between measures. Our rating improvement guide explains how to turn recommendations into a considered plan.

Frequently asked questions

Do I need to be at the property?

Someone needs to provide the agreed access. Confirm whether an owner, tenant, agent or authorised keyholder will attend and how any questions about the property will be answered.

Will the assessor open up walls?

A routine existing-home EPC inspection is not a destructive survey. Hidden features need acceptable evidence or are treated under the methodology's rules.

Should I turn the heating on before the visit?

Ask your assessor about any specific preparation. The assessment is not a competition to make the rooms feel warm on the day; the installed systems and building features are what matter.

Can EPC Agent assess my Wolverhampton property?

You can enquire through our Wolverhampton EPC page. Give the property details and preferred date so we can confirm the arrangements.