Plan Archive is a searchable research platform for planning appeal decisions in England and Wales. It helps planning consultants, architects, developers, local authorities and other researchers find decisions relevant to a particular planning issue, without having to trawl through large numbers of decision letters. Rather than treating every keyword mention as equally significant, Plan Archive identifies the issues considered by the Inspector and links its issue-based summaries to the original decisions.

Users can search thousands of indexed cases, browse by outcome, explore maps, and look up local planning authorities or Inspectors. The archive includes information on whether appeals were allowed, dismissed or split, alongside case details and findings on matters such as heritage, living conditions, ecology and biodiversity. Plan Archive also publishes analysis and guides on appeal processes and planning topics, helping users research precedent, assess arguments and understand how Inspectors have approached proposals.

The service offers free access to search and explore the archive, with pricing information available on the site