If you want to build anything with UK house price data, four free datasets do most of the work: HM Land Registry Price Paid Data, the EPC register, ONS Census 2021 and OpenStreetMap. This post covers what each one contains, how they are licensed, where they join badly, and what a street-level result looks like using postcode district CR5 (Coulsdon, in the London Borough of Croydon) as a worked example.

I run Door Number, a free property information site built on these datasets. Everything below was checked on 8 November 2026.

What does each dataset contain?

Dataset Publisher What you get Licence

Price Paid Data HM Land Registry Every residential sale in England and Wales: price, date, postcode, property type, new build flag, freehold or leasehold, address parts Open Government Licence v3.0

EPC register MHCLG Energy certificates: floor area, construction age band, built form, energy rating, UPRN Open Government Licence (check the terms on address fields)

Census 2021 ONS Population, households, tenure,…