Can I extend my house?

One postcode gets you: the designations that actually constrain your plot, your council's measured approval rate for extensions, and named recent approvals on streets near you — the precedents an officer can't ignore.

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: Can I Extend My House?

One postcode: your designations, your council's measured extension approval rate and decision speed, and named recent approvals on nearby streets.

When to use it

Use at the daydream stage. What was approved next door is the strongest signal for what you can build.

Policy and guidance it draws on

Decided-application corpus, designation polygons

Part of Authority Intelligence

Use these tools to understand how your Local Planning Authority behaves — what they approve, what they refuse, how often appeals succeed, and what strategy gives you the best chance. This is behavioural intelligence, not just policy research.

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Planning Risk Score™LPA ProfileNPPF TrackerCommittee PredictorCommittee vs Delegated AnalysisHousing SupplyPre-App Strategy BuilderStrategy Simulator

Guidance to help you prepare — not formal planning advice. Check the current policy text and your council's local plan before relying on it.

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