The EPC Register is the free source. UKDataAPI adds area-level aggregation, grid carbon, and ESG scoring — API-native instead of CSV downloads.
The EPC Register is the official DLUHC open dataset of Energy Performance Certificates for properties in England and Wales. It's free to access and contains 90+ fields per property — energy rating, CO2 emissions, heating type, wall construction, and more. But the raw data is property-level: to understand an area's energy profile, you need to download bulk CSV files, filter by postcode, and calculate your own aggregations. UKDataAPI's Energy endpoint does this automatically — it returns area-level EPC distributions, average ratings, CO2 emissions, and heating types, combined with real-time grid carbon intensity from National Grid ESO and a proprietary ESG Score. For developers building energy efficiency tools, ESG dashboards, or retrofit planning systems, UKDataAPI turns raw EPC records into actionable area intelligence.
| Feature | UKDataAPI | EPC Register |
|---|---|---|
| Individual property EPC data | Area-level aggregation (not per-property) | ✓Full individual EPC certificates |
| Area-level EPC distribution | ✓Average rating, A-G distribution, CO2 averages | Manual calculation from raw data |
| Grid carbon intensity | ✓Real-time gCO2/kWh from National Grid ESO | Not included |
| Generation mix | ✓Live breakdown: wind, gas, solar, nuclear, etc. | Not included |
| ESG Score | ✓0-100 composite with factor breakdown | No scoring |
| Heating type analysis | Dominant heating types in area | Per-property heating data |
| Historical EPC data | Latest aggregated snapshot | ✓Full historical EPC records since 2008 |
| Data coverage | England and Wales (postcode query) | England and Wales (property-level) |
| Output format | ✓Structured JSON API | CSV downloads + basic API |
| Batch processing | Up to 500 req/min | Bulk CSV downloads available |
| Cost | From £0.005/call (200 free credits/month) | ✓Free — open data under OGL |
| AI agent access (MCP/x402) | ✓Native support | Not available |
UKDataAPI
From £0.005/call (summary) to £0.025/call (full). Pay-as-you-go. Free tier: 200 credits/month.
EPC Register
Free. Open data under the Open Government Licence. Bulk downloads and basic API available.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://www.ukdatapi.com/api/v1/energy/EH1%201YZ?depth=standard" # Returns: area EPC distribution, average rating, CO2 emissions, # grid carbon intensity, generation mix, ESG Score (0-100) # Cost: 12 credits (£0.025)
200 free credits. No contract. No credit card.
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