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Do I Need Planning Permission?

Pick what you'd like to build and see, in plain English, the size and height limits that let it go ahead as "exempted development", no application needed.

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A guide, not a decision. This tool summarises the main national exempted-development rules for a standard house. Exemptions can be removed or reduced by your property's planning history, a protected-structure or conservation-area status, and other site-specific factors. It is general guidance, not formal planning advice or a legal confirmation. If it's close to the limits, or anything is unusual, ask us, or seek a formal Section 5 declaration from your local authority.

Borderline Cases

Exemptions turn on the detail. If your project is near a limit, on a protected or corner site, or you've extended before, a quick word now can save an enforcement headache later.

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