Permitted Development Rights: What You Can Build Without Planning Permission
A plain-English guide to what you can and cannot build under Permitted Development — and when you actually need to apply for planning permission.
What is Permitted Development?
Permitted Development (PD) rights allow you to make certain changes to your home without applying for planning permission. They are automatic rights granted by Parliament, not by your local council. But they come with conditions — break a condition and you need full planning permission.
What you CAN build under PD
Single-storey rear extensions up to 4m from the original rear wall (8m for detached houses). Loft conversions adding up to 40m³ of space (50m³ for detached). Outbuildings, porches, and internal alterations. All subject to specific height, boundary, and material conditions.
What you CANNOT build under PD
Extensions to the front of your property. Any extension that would result in more than half the garden being covered. Extensions higher than the existing roof. Balconies or raised platforms. Any work to a listed building requires Listed Building Consent — PD does not apply.
When PD rights are removed
Your PD rights may be reduced or removed if you live in a conservation area, National Park, AONB, or if an Article 4 direction applies. Some new-build properties have PD rights removed by condition on the original planning permission. Always check before assuming PD applies.
Certificate of Lawfulness vs planning permission
A Certificate of Lawfulness is not the same as planning permission. It is a legal document confirming that your proposed work falls within PD rights. It is not legally required, but it protects you at resale — mortgage lenders and solicitors expect it. We handle the full application for £1,500.
Written by the PlanBuildCo team
9 years designing extensions and renovations in Poole, Dorset.
Ready to take the next step?
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