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Do I need planning permission?
Answered against the actual designations at your postcode — Article 4 directions, conservation areas, green belt — from national polygon data, plus your council's measured decision record. Not a generic flowchart.
What this is: data intelligence computed from public planning records — application registers, decision notices, appeal decision letters and national designation polygons (planning.data.gov.uk). Every figure states its source and sample. What this is not: formal planning advice, and designation boundaries are checked against the postcode centroid, not your exact property line. For certainty on your specific case, speak to a chartered planning consultant — our specialist directory can help.
About this tool: Do I Need Permission?
First-step triage across permitted development, prior approval, lawful development certificate and full application routes.
When to use it
Use at the very start to confirm whether your works need an application at all, and if so which route.
Policy and guidance it draws on
GPDO 2015, TCPA 1990 Section 55
Part of Route Intelligence
Use these tools to determine whether you need planning permission and which type of application to submit. Getting the consent route wrong wastes time and money. Check PD rights first, then consider whether prior approval or full planning is the better option.
Related tools
PD Rights CheckerChange of UsePrior ApprovalLDC CheckerListed BuildingEIA ScreeningGreen BeltAmendment AdvisorGuidance to help you prepare — not formal planning advice. Check the current policy text and your council's local plan before relying on it.