Plan Then Build

Garden rooms and outbuildings: permitted development rules

Class E covers sheds, garden offices and other buildings incidental to the enjoyment of the house.

Must be single storey, incidental to the house (not a self-contained separate dwelling), and not forward of the principal elevation.

Maximum height 4m with a dual-pitched roof, 3m for any other roof - dropping to 2.5m within 2m of a boundary.

Counts toward the 50% curtilage coverage limit shared with house extensions.

Permitted Development & Cost Checker

England only. Takes about a minute.

Last reviewed 2026-09-01. Guidance, not legal advice.