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EPCADVISOR

Data Transparency

About Our Data

We believe in transparency about our data sources, how we process information, and the limitations of what we can provide.

Total Properties

25M+

EPC records in our database

Coverage

England & Wales

Scotland coming soon

Update Frequency

Monthly

Following DLUHC releases

Local Authorities

340+

Full geographic coverage

Data Sources

DLUHC Bulk Dataset

Our primary source is the Open Energy Performance Certificates dataset published by the Department for Levelling Up, Housing and Communities. This contains all domestic EPCs lodged in England and Wales.

  • Over 25 million EPC records
  • Full property details and recommendations
  • Published under Open Government Licence v3.0
View source dataset →

EPC Register API

For the most up-to-date information, we can query the official EPC Register API. This ensures you see the latest certificate data, even for recently lodged EPCs.

  • Real-time property lookups
  • Latest certificates not yet in bulk data
  • Automatic fallback to bulk data if unavailable

Update Frequency

We update our database on a regular schedule to ensure data freshness:

  • Bulk data refresh: Within 7 days of each monthly DLUHC release
  • API-sourced data: Real-time, cached for 24 hours after first lookup
  • Aggregate statistics: Recalculated after each bulk data update

New EPC certificates are typically lodged within 24 hours of an assessment. They appear in the API immediately but may take up to 3 months to appear in the bulk dataset.

Data Limitations

Assessment Quality

EPC data quality depends on the original assessment. Different assessors may reach slightly different conclusions for the same property.

Point-in-Time Data

EPCs reflect the property at the time of assessment. Improvements made since the last EPC won't be reflected until a new assessment is lodged.

Cost Estimates

Improvement costs are indicative ranges. Actual costs vary significantly based on property specifics, location, and market conditions.

Scotland Not Covered

We currently only cover England and Wales. Scotland uses a separate EPC system managed by Energy Saving Trust. Scottish coverage is planned for a future update.

Independence Statement

EPC Advisor is an independent service operated by Zanzero Ltd. We are not affiliated with, endorsed by, or connected to:

  • The Department for Levelling Up, Housing and Communities (DLUHC)
  • GOV.UK or any government department
  • The official EPC Register

We use publicly available government data under the Open Government Licence. Our recommendations and partner suggestions are our own and do not represent government advice.

Related Pages

About Our Data | EPC Advisor