Garden Rooms
Garden room planning permission explained
The size and position limits that typically apply.
Many garden rooms fall under permitted development as outbuildings, subject to limits on height, position relative to boundaries, and how much of the garden is already covered by outbuildings. Using the space as self-contained separate living accommodation, rather than an incidental use like an office or gym, can change the position.
Last updated 17 August 2026
The general permitted development position
Garden outbuildings, including garden rooms, are generally permitted development subject to conditions: a maximum height (lower if within 2m of a boundary), not being forward of the main house's front elevation, and not covering more than half the garden once other outbuildings are accounted for.
The use matters too. An outbuilding used for a purpose incidental to the enjoyment of the house — an office, a gym, a hobby room — is treated differently from one used as genuinely separate, self-contained living accommodation, which is more likely to need a full application.
What we'll confirm before designing yours
Garden size, existing outbuildings, boundary distances and your property's planning history all affect what's actually possible. We'll confirm what applies to your specific garden before design work begins, rather than assuming the general rule holds.
FAQs
Does a garden room need planning permission?
Many garden rooms don't, if they meet the standard outbuilding permitted development limits — but it depends on size, position and how the space will be used. We'll confirm what applies to your garden before design begins.
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