EPC Data and Registers

EPC data is held on registers, which are official databases of certificates, searchable by address in many jurisdictions. A register record shows the certificate, its rating, its assessment date, and the data behind it, such as wall type and heating system, in a form that can be checked against a paper copy. Registers exist so buyers, tenants, landlords and researchers can verify a certificate rather than relying on a marketing claim.

Registers also serve a wider purpose. Aggregated, anonymised register data helps governments understand housing stock, target renovation programmes, and track progress towards energy goals. That research use is separate from an individual transaction, and it relies on the same underlying data, cleaned and grouped, rather than on individual homes being identified in published statistics.

To use a register, search by address or certificate reference, and check that the record matches the property, including flat number, property type and assessment date. The register should show the latest certificate for that address; older certificates may also be visible as history, which is useful for seeing whether a rating changed after work, or whether an old certificate is being presented as current.

Register data includes inputs as well as outputs. Feature ratings, assumed construction, heating system and recommendations are part of the record, and those details allow a reader to test a certificate against the home. If register data differs from a paper copy, the register record is generally the authoritative version, and the discrepancy should be queried with the assessor or register operator before the certificate is relied on.

Check authenticity first. A certificate that cannot be found on the relevant register, or whose reference number does not match, should not be relied on in a transaction until its provenance is explained. Check also that the assessor shown is accredited, and that the certificate has not been superseded by a later assessment for the same address.

Check history where available. A home whose rating improved sharply between certificates may have had genuine work done, or may have had an input corrected, and the difference matters for judging future work. Ask the seller, landlord or agent for evidence of work corresponding to any rating change, rather than assuming the change proves a particular measure was carried out.

In England, Wales and Northern Ireland, EPCs are held on a national register with public search by address, while Scotland operates its own register with its own search arrangements. A search that fails in one register may succeed in another if the property's nation is misidentified, so check the correct nation's register first, and note that data fields and presentation differ between them.

In EU member states, register arrangements are national and access rules vary: some registers are fully public, others restrict access to owners, assessors or authorised parties, and some publish only aggregated data. A researcher or buyer working across borders should therefore expect different levels of access, and should not assume that a certificate searchable in one country will be searchable in the same way in another.

One mistake is relying on a paper copy without checking the register. Paper copies can be outdated, superseded, or for a different property, and only the register shows the latest record. A few minutes on the register before a transaction can prevent reliance on a certificate that no longer represents the home.

Another mistake is treating register data as a complete building record. Registers show assessment inputs, not condition, ownership, planning or safety information, and they do not show work done since assessment unless a new certificate has been lodged. A register check complements, but does not replace, surveys, title checks and other due diligence in a transaction.

Keep the register reference, assessment date and a copy or print of the register record with transaction paperwork, alongside any paper certificate. Note the register searched and the date searched, because register data can change when a new certificate is lodged, and a dated record shows what was known at the time of decision.

Ask an assessor or register operator how to correct register data if an input is wrong, and what evidence is needed. Ask a solicitor or conveyancer what register evidence is required for your transaction type in your jurisdiction. This guide is educational, and register rules should be checked in current official guidance.