Planning permission for a two-storey extension on a semi-detached house

Permitted development limits for a two-storey extension on a semi-detached house

Depth

Up to 3m beyond the rear wall of the original house — there's no Prior Approval route beyond this.

Rear boundary distance

Must be more than 7m from the rear boundary.

Materials and height

Eaves and ridge height must not exceed the existing house, and materials must match.

Curtilage coverage

Buildings other than the original house must not cover more than 50% of the curtilage.

Article 4 directions and conservation areas can remove or tighten these rights locally — checked automatically above. Always confirm with a Lawful Development Certificate before starting work.