Planning
Do you need planning permission for a garden room or office?
A garden room is permitted development if it is single storey, no more than 2.5 metres high within 2 metres of a boundary (or 3 metres flat, 4 metres pitched further in), and not used for sleeping.
In short
A garden room or garden office is usually permitted development and needs no planning permission, provided it is single storey, sits behind the principal elevation of the house, and meets the height limits: a maximum of 2.5 metres if it is within 2 metres of any boundary, otherwise up to 3 metres for a flat roof or 4 metres for a dual-pitched roof, with eaves no higher than 2.5 metres. Together with other outbuildings it must not cover more than half the garden, and it cannot be used as self-contained or sleeping accommodation. Designated land and listed properties have tighter rules.
The thresholds
Where the line sits
The single rule that catches most people is the 2.5 metre height limit within 2 metres of a boundary. Gardens are rarely deep enough to sit a room more than 2 metres off every fence, so in practice the room is designed to come in under 2.5 metres overall. Further from the boundar
| Limit | Permitted development |
|---|---|
| Position | Behind the principal elevation of the house |
| Height within 2m of a boundary | 2.5m maximum |
| Height with a flat roof, further in | 3m maximum |
| Height with a dual-pitched roof, further in | 4m maximum |
| Eaves height | 2.5m maximum |
| Coverage with all outbuildings | 50% of the garden maximum |
| Sleeping or self-contained living | Not allowed under PD |
Source: Gardenscape. Figures as of 2026-06-01.
Yes, no, or it depends
Scenarios in plain language
Often. They generally apply if the internal floor area is over 15 square metres and within a metre of a boundary, if it is over 30 square metres, or if it contains sleeping accommodation. We design to stay compliant.
A home office or studio is fine. Self-contained living or sleeping accommodation takes it outside permitted development and may need full planning permission.
In the Cotswolds National Landscape or a conservation area, permitted-development rights for outbuildings are restricted, and an Article 4 direction can remove them. Confirm the status of the property first.
The local layer
Designated land and Article 4
The single rule that catches most people is the 2.5 metre height limit within 2 metres of a boundary. Gardens are rarely deep enough to sit a room more than 2 metres off every fence, so in practice the room is designed to come in under 2.5 metres overall. Further from the boundaries you have more height to play with, up to 3 metres for a flat roof or 4 for a pitched one. There are two other limits worth knowing. The building must sit behind the front of the house, and all your outbuildings together must not cover more than half the garden. Building regulations are separate from planning. The
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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