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Over 2,000 Brownfield sites across London, equivalent to more than 2% of the land in Greater London. The database, maintained by the Homes and Communities Agency, provides polygon boundaries for sites down to 0.1 hectares and includes overlays for transport, deprivation, and environmental assets. It was last updated on 2026-03-25.
The description notes the data is maintained by the HCA and their online mapping site may be password protected; access methods may require verification.