Planning Permission Checker

Find out whether your home improvement project is likely to be permitted development or needs planning permission. Free instant results for England, with guidance for Wales, Scotland, and Northern Ireland.

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Site Constraints Report

Search real planning constraints for any UK postcode

Enter your postcode to check 12 planning databases including conservation areas, listed buildings, flood risk zones, green belt, TPOs, AONBs, Article 4 directions, and more. Data sourced from the official Planning Data API (planning.data.gov.uk).

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© 2026 CalcStack — a Flavoureak UK Ltd product. Planning permission guidance provided by this tool is for general information only. Always verify with your Local Planning Authority before starting work. CalcStack accepts no liability.