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Permitted Development Limit Checker

Enter your extension dimensions to check each PD condition individually. See which limits you pass, which you fail, and what your options are.

m

Measured from the original rear wall of the house (not as extended by previous owners)

m

From highest adjacent ground level to the top of the roof

m

Height to the underside of the eaves (where roof meets wall)

m

The 3m eaves limit applies within 2m of a boundary

%

All extensions + outbuildings as percentage of the land around the original house

Also applies to AONBs, National Parks, the Broads, and World Heritage Sites