EPC guide 03
When do you need an EPC?
An Energy Performance Certificate is commonly needed when a home is built, sold or let. The exact rules and exemptions depend on the property and where it is located, so use this page as a starting point and check the current official guidance for your circumstances.
The usual situations
For dwellings in England and Wales, an EPC is generally required when a property is constructed, marketed for sale or offered for rent. Its purpose is to give prospective buyers and tenants standardised information about the energy performance of the building and practical ways it could be improved.
The person responsible for a sale or letting should make the certificate available at the appropriate time. Requirements can be different for Scotland and Northern Ireland, and non-domestic buildings follow separate guidance. If a transaction is unusual, or a property may be exempt, seek current professional or official advice rather than relying on a general summary.
How long a certificate lasts
A domestic EPC is normally valid for ten years, or until a newer EPC is produced for the same building. A certificate can remain formally valid even if it no longer describes the property well because insulation, windows or heating have changed. A new assessment may be useful whenever up-to-date information matters.
Think of the date as part of the evidence. Read the assessment date alongside the construction and services sections, and ask whether the certificate pre-dates renovation work or a change in heating. This is also why a missing or old record should not be used to assume that no energy-related work has been done.
If you cannot find a certificate
- Try the postcode and select the exact address as it appears on the register.
- Check whether the property is a flat, converted building or has a different address format.
- Remember that an EPC may not have been required for a particular past transaction.
- For a formal search or a new certificate, use the government service and an accredited assessor.
Protected and unusual buildings
Some buildings that are protected because of their architectural or historic interest can be exempt where compliance with minimum energy-performance requirements would unacceptably alter their character or appearance. That is not a blanket exemption for every older or listed property. The facts of the building and the proposed work matter.
If heritage constraints apply, make early contact with the relevant local authority or an experienced adviser. Retrofit measures can be valuable in traditional buildings, but they need to respect the fabric and its ability to manage moisture. EPC Checker flags public heritage context as a prompt to investigate, not as a planning decision.
Getting a new EPC
A new certificate requires an assessment by an accredited energy assessor. Before making an appointment, collect any useful records of improvements, such as insulation details, window specifications or heating-system information. The assessor will still need to make their own observations and apply the approved methodology.
A new EPC can make the public record more representative of a renovated home, but it should not be treated as a substitute for specifications, warranties or maintenance records. Keep those documents with the property information as well.
Use the certificate for the right purpose
The EPC is a useful point of comparison and a route into the public register. It is not a condition survey or a guarantee about energy bills. Read the certificate’s detail before using it to compare homes, and seek advice before relying on it for a major financial, legal or construction decision.
If you have already found a record, our guide to reading an EPC explains how to distinguish the headline rating from the underlying features and assumptions.