Answer
How tall can a garden room be without planning permission?
2.5 metres within 2 metres of a boundary, otherwise 3 metres flat or 4 metres pitched.
In short
A garden room is permitted development up to 2.5 metres high if it is within 2 metres of any boundary. Beyond 2 metres from the boundary it can be up to 3 metres for a flat roof or 4 metres for a dual-pitched roof, with eaves no higher than 2.5 metres. Any room used for sleeping needs planning permission whatever its height.
A note
General guidance, not advice. Rules vary by site, and Article 4 directions or conditions can change what applies. Check with your local authority and the Planning Portal.
- Source: Planning Portal: outbuildings
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