How big can a porch be without planning permission?
A porch can have up to 3 m² of external floor area and be up to 3 m high without planning permission, as long as no part is within 2 m of a boundary with a highway. Anything bigger, taller or closer needs permission. Flats, listed buildings and some designated areas have tighter limits.
What are the permitted development limits?
- Maximum 3 m² of external ground area
- Maximum height 3 m
- At least 2 m from any boundary with a highway
Does a porch need Building Regulations approval?
Usually not. A porch at ground level under 30 m² is normally exempt, provided the glazing meets safety rules, the porch is thermally separated from the house, and the house heating does not extend into it.
When does a porch need permission?
When it exceeds those limits, when the house is a flat or listed, or when Article 4 directions or designated land apply. Local authorities can confirm, and a lawful development certificate puts it in writing.
Order from the trade counter at Unit 1, Friar Walk, Worthing, with free delivery within 30 miles. See the porches range for specs.
Need a trade price? Call the trade counter on 01903 262 636 or visit us at Unit 1, Friar Walk, Worthing. We offer free delivery within 30 miles.
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