Home › Data sources
Data sources and methodology
Price Paid Data — HM Land Registry
Every residential sale in England and Wales lodged for registration since January 1995. Published as a single open file, updated monthly, under the Open Government Licence v3.0. This is the whole of the sold-price side of the site. It records the consideration — what was paid — and it contains no buyer or seller identity of any kind.
What is excluded from the averages, and why
Bulk and portfolio transfers. HM Land Registry repeats the whole consideration against every title in a multi-property transfer. Left in, a £42m six-property portfolio contributes six £42m "house prices". Those rows are found, shown at block sales, and excluded from every median and average.
Nominal consideration. Transfers of £1,000 or less are gifts, family transfers and corporate reshuffles, not sales. They are flagged and excluded.
Both are still visible on an address’s own page, clearly marked. Hiding a real registry entry from someone looking up their own home would be worse than showing it with a caveat.
UK House Price Index
Published monthly by HM Land Registry with the Office for National Statistics. Mix-adjusted, so it is not comparable with the raw medians elsewhere on this site — that is the point of showing both.
Ownership — CCOD and OCOD
Price Paid Data cannot tell you who bought anything. Buyer identity comes from two further HM Land Registry publications: CCOD (UK companies that own property in England and Wales) and OCOD (overseas companies). Both are free and published monthly, and both sit behind a registered account with an API key rather than an open download. Where the join has not run, this site says the buyer is not identified rather than inferring one.
Matching is deliberately narrow — full postcode plus the street number — because the register and the price data write the same property differently, and a loose match hands a reader a neighbour’s owner. A transfer is only attributed when the register agrees across at least half its titles.
Companies House
Company status, incorporation date, officers and people with significant control, from the public Companies House API. Officers’ dates of birth and residential addresses are returned by that API and are deliberately not published here.
Licences
What each publisher permits, dataset by dataset. Where a publisher states no licence, this table says so instead of assuming one.
| Dataset | Publisher | Licence | Commercial | Derivatives |
|---|---|---|---|---|
| Price paid — 31.3M sales Attribution statement required. The ADDRESS fields (postcode, PAON, SAON, street, locality, town, district, county) are Ordnance Survey AddressBase / Royal Mail PAF data — OGL explicitly does not cover those third-party rights. Royal Mail and OS permit their commercial use only "to display for the purpose of providing residential property price information services", which is what this site does. | HM Land Registry | OGL v3.0 | ⚠ | ✔ |
| UK House Price Index Attribution required. | HM Land Registry & ONS | OGL v3.0 | ✔ | ✔ |
| Planning applications — 1.28M No licence is stated on the Planning London Datahub, on its London Datastore entry, or in the API response. The data is served openly with a published guest key, but open access is not the same as a licence grant. Treated as unknown until the GLA states terms. | Greater London Authority | Unknown | ? | ? |
| Planning applications — 350k Each council publishes on its own terms; most cite OGL v3 but not all state one. Per-dataset terms are on the publishing council's own page. | 56 local authorities | Varies | ~ | ~ |
| Statutory protections — 520k Confirmed in each dataset's own metadata. Underlying designations originate with Historic England and local authorities; the platform publishes them under OGL. | MHCLG (planning.data.gov.uk) | OGL v3.0 | ✔ | ✔ |
| Postcode centroids — 1.57M Attribution required. Northern Irish postcodes are excluded by the publisher as they carry a more restrictive licence. | GetTheData, from the ONS Postcode Directory | OGL v3.0 + OS OpenData | ✔ | ✔ |
| Estate agent branches — 6,271 ODbL is SHARE-ALIKE: a derived database must itself be offered under ODbL. Used here for discovery — which agents exist and where — not republished as a database. | OpenStreetMap contributors | ODbL 1.0 | ✔ | ⚠ |
| Company records Officers' dates of birth and residential addresses are returned by the API and are deliberately not published here. | Companies House | OGL v3.0 | ✔ | ✔ |
| CCOD / OCOD ownership NOT OGL. Free but behind a registered account and API key, with its own terms on republication. Not currently used — no key — so no obligation has been taken on. | HM Land Registry | Own terms, account required | ? | ? |
| Agent listings — 2,788 Read from each agent's own website where robots.txt permits. Not a licensed dataset: shown as a link to the agent, never republished in bulk. | Individual estate agents | Not open data | ✘ | ✘ |
✔ permitted · ⚠ permitted with conditions · ? not stated by the publisher · ~ varies. Verified against each publisher's own terms, 22 August 2026. Where a publisher states nothing, this says Unknown rather than assuming.
What this site is not
It is not a valuation, an estate agent, or a source of live listings. Every number is a record of something that already happened. Confirm against the source before relying on it for anything that matters.