The source register
Every source Door Number is permitted to use, with its licence and required attribution. All are official or open, and free to use.
Where a fact on a property page is significant, its source, the date of the underlying record and the date Door Number last checked it are shown next to the fact itself.
Property data served by Resi IQ, drawn from public records.
HM Land Registry Price Paid Data
Contains HM Land Registry data © Crown copyright and database right. Licensed under the Open Government Licence v3.0.
Energy Performance of Buildings Register
Energy Performance of Buildings data © Crown copyright. Contains UPRN data © Crown copyright and database right, Ordnance Survey.
Contains OS data © Crown copyright and database right.
Door Number launch-address registry
Address verified and published by Door Number. No property data has been sourced from a records provider for this address.
Door Number statistic, derived from the cited official records — not an official figure.
Contains public sector information licensed under the Open Government Licence v3.0.
Planning London DataHub (Greater London Authority)
Contains planning application data from the Planning London DataHub, © Greater London Authority and the London boroughs, licensed under the Open Government Licence v3.0.
Contains Environment Agency information © Environment Agency and database right, licensed under the Open Government Licence v3.0.
Get Information about Schools (DfE)
Contains Department for Education data licensed under the Open Government Licence v3.0.
Contains Ofsted data licensed under the Open Government Licence v3.0.
NaPTAN (national public transport access nodes)
Contains NaPTAN data © Crown copyright, licensed under the Open Government Licence v3.0.
© OpenStreetMap contributors, licensed under the Open Database Licence.
OpenStreetMap via Overpass API
© OpenStreetMap contributors, licensed under the Open Database Licence.
Historic England, National Heritage List for England
Contains Historic England data licensed under the Open Government Licence v3.0.
Data from Wikidata, dedicated to the public domain under CC0.
Text adapted from Wikipedia, licensed under CC BY-SA 4.0.
Image via Wikimedia Commons: see the per-image credit for its author and licence.
Image via Geograph Britain and Ireland, licensed under CC BY-SA 2.0.
Census 2021, Office for National Statistics
Census 2021 data from the Office for National Statistics, via Nomis. Contains National Statistics data © Crown copyright and database right. Licensed under the Open Government Licence v3.0.
ONS Postcode Directory (via postcodes.io)
Postcode-to-area lookup from the ONS Postcode Directory via postcodes.io. Contains OS data © Crown copyright and database right; contains Royal Mail data © Royal Mail copyright and database right; contains National Statistics data © Crown copyright and database right. Licensed under the Open Government Licence v3.0.
Historical map names from the GB1900 Gazetteer (Abridged), transcribed from Ordnance Survey County Series maps by volunteers. © Great Britain Historical GIS Project, University of Portsmouth, and the GB1900 partners and volunteers. Licensed under CC BY-SA 4.0.
When a source is unavailable
Door Number makes no paid API calls and uses no commercial data brokers. If a source is temporarily unavailable, the section that depends on it is hidden rather than filled with a guess.
Why the same source can appear more than once
Some services publish the same underlying open data through different interfaces. The page names the interface that supplied the record, while the source register keeps each permitted source and attribution explicit.