Public records, cleaned and scored.

From the MHCLG Energy Performance of Buildings Register, the official UK government source for domestic EPC certificates in England and Wales. The register currently holds around 24 million EPC certificates; we index them and deduplicate by UPRN into 17.78 million unique properties. The data is published under the Open Government Licence v3.0, free to query, and the same source that fed the now-retiring epc.opendatacommunities.org endpoint. We sync within 14 days of each new certificate being issued, so a property that gets a fresh EPC in early May is searchable on EPC Hunt by mid-May. Scotland publishes through a separate Scottish EPC register; we do not index Scotland today.

We refresh the full EPC index every 14 days. New certificates issued by domestic energy assessors land on the MHCLG register typically within 24–72 hours of the assessment; we ingest from the register on a fortnightly schedule. Each property in our index carries a last-refresh timestamp so you can see exactly when its EPC data was last verified. Freshness guarantee on every plan: any property record in your export older than 90 days is replaceable on request. The fortnightly cadence is a deliberate trade-off between freshness and the rate-limiting on the source endpoint — a daily refresh is technically possible but expensive enough that we would have to charge for it.

A postcode covers between 10 and 100 properties; a UPRN identifies one. The Unique Property Reference Number is a 12-digit code assigned to every addressable location in Great Britain by Ordnance Survey, published as part of OS Open UPRN under the Open Government Licence. We use UPRN as the primary key for our 17.78 million-property index — it is what lets us deduplicate two EPC certificates issued for the same flat at different times into one property record. Postcode is the search interface; UPRN is the data spine. When you export a CSV, the UPRN column is what you join on if you bring in third-party data later.

MHCLG retires the legacy epc.opendatacommunities.org endpoint on 30 May 2026 and consolidates onto the new Find an Energy Certificate service. Our ingestion adapters cover both the legacy and replacement endpoints, so the refresh cadence on EPC Hunt is unaffected through the cutover. The data-sources page banner will update once the new endpoint is the only one in use.