Question to the Department for Levelling Up, Housing & Communities:

To ask the Secretary of State for Communities and Local Government, what estimate he has made of the amount of undeveloped brownfield land which his Department considers suitable for development.

The National Land Use Database provides data from local authorities on all previously developed land in England that may be available for development.

https://www.gov.uk/government/collections/national-land-use-database-of-previously-developed-land-nlud-pdl