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How much can I extend my house without planning permission?
I’ve heard some extensions don’t need planning permission, but I’m confused about how much you’re actually allowed to build. What are the usual limits, and when does planning become unavoidable?
Expert Trade Answers
"Single storey extension to rear is 3m for an attached property
4m for a detached property.
Single storey to the side up to half the width of your existing house.
Further information is available on the planning portal website."
4m for a detached property.
Single storey to the side up to half the width of your existing house.
Further information is available on the planning portal website."
Answered on 28th Jan 2026 - Member since Nov 2022 -
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