We process the official EPC statistics so you can see where the work is, without paying a data broker for it.
Most of the data insulation and heat pump firms get sold is the same public register, repackaged. The register is free and so is our processing of it. Take the tools, take the CSV, and put the budget into vans instead.
Ranks all 319 local authorities in England and Wales by retrofit opportunity, weighted for the kind of work you do: volume loft and cavity, hard-to-treat solid wall, heat pumps and off-gas, or areas nobody has worked yet. Exports to CSV.
Open the tool →Every authority, band by band, with modelled heating cost, energy intensity and the shift in certificate mix since 2015. Take it into your own spreadsheet or CRM. No attribution required beyond the licence terms.
Download CSV →Address-level search of the EPC register: filter a postcode or outcode by band, property type, wall construction and whether the property is on mains gas. The tool is built and the endpoint is deployed; it needs the government API credentials switching on before it returns results.
Not yet available. See the note below.We do not sell leads, and we do not pass householder contact details to anyone. Our calculators are built to give a person their answer on the page rather than to harvest a phone number, which is a deliberate choice and the main reason this site exists.
That means these tools help you find where the work is. They will not hand you a list of people who have asked to be called, because we do not have one.
A purchased lead costs somewhere between £25 and £100 and is often resold. Territory data costs nothing and tells you something a lead never does: what the housing is actually made of. An area with 9% of certificates in bands F and G is full of solid-walled, off-gas property that needs external wall insulation and a heat pump. An area sitting mostly in band D needs loft top-ups and cavity fills. Those are different vans, different crews and different quotes.
The other thing the data shows is where the competition has already been. Our retrofit activity measure compares the certificates lodged in 2015–17 with those lodged since 2023. Areas that have barely moved have thinner competition, though usually thinner grant funding too.
The EPC register is open data under the Open Government Licence, and it includes addresses. That the data is public does not by itself make every use of it lawful, and this is where installers most often get into trouble.
We are not lawyers and this is not legal advice. If you intend to contact households directly, get your own advice first, and read the ICO's guidance on direct marketing.
The address-level tool is written and its endpoint is on the server. It sits behind the government's EPC Open Data API, which requires an account and an API key issued to a named person. Once those credentials are installed the tool starts returning results; nothing else needs to change.
The design keeps the key server-side, so it is never exposed to a browser, and the endpoint is rate-limited and restricted to requests from this site.
The Ministry of Housing, Communities and Local Government. The area tools use the published quarterly live tables; the postcode search uses the EPC Open Data register. Both are Crown copyright under the Open Government Licence v3.0. We add the processing and the scoring, not the underlying numbers.
The area data runs to 30 June 2026 and is republished quarterly. We refresh within a few days of each release.
Yes, with no signup. It holds no personal data, so there is nothing worth gating.
Possibly. If there is a cut of this data that would be genuinely useful to you, say what it is on the contact page. We would rather build the thing people actually ask for than guess.