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Do summerhouses or garden offices need building regulations approval?
If you plan to put up a small, detached building like a garden shed, garden room, garden office, annexe or summerhouse (all classed as outbuildings), building regulations generally won’t apply if the building has a floor area under 15 square metres and does not include any sleeping accommodation.
For buildings with a floor area between 15 and 30 square metres, building regulations approval is usually not needed - as long as the building does not include sleeping accommodation and either:
- it is at least one metre away from any boundary, or
- it is built mainly from non-combustible materials.
Read more about the building regulations that apply to outbuildings.
Don't forget to check the permitted development rights for outbuildings.
Common Questions
Removing a non-load bearing wall will likely not require building control approval provided it does not affect fire escape routes, ventilation, drainage or electrics.
It is best practice to get a report from a structural engineer to ensure the wall is non-load bearing prior to starting any work.
Adding an internal wall will not require planning permission or building control approval in most cases. If the building is listed, then you may require listed building consent to make a major alteration to the house.
Any work completed should adhere to building regulations, ensuring fire routes, electrics and ventilation are considered.
Rules governing outbuildings apply to sheds, playhouses, greenhouses and garages as well as other ancillary garden buildings such as swimming pools, ponds, sauna cabins, kennels, enclosures (including tennis courts) and many other kinds of structures for a purpose incidental to the enjoyment of the dwellinghouse.
If you are unsure if your planned building falls into the category of 'outbuildings' or if you are unsure if planning permission is required, please contact your local planning authority.
Outbuildings are considered to be permitted development, not needing planning permission, subject certain limits and conditions.
Read about the limits and conditions for outbuildings
The UK Government provide access to public land records, allowing you to check certain restrictions on land. You can use the online tool to check whether your land is in a conservation area.
VisitGOV.UK and use the planning data map.
(This map covers planning data for England).
If you are unsure you should contact your local planning authority.
A roof window (or skylight) is fitted flush within the slope of a roof, while a dormer projects outward, creating additional headroom and floor space.
Both can be installed under permitted development but must meet specific size and position limits to qualify.
Also consider building regulations for a new dormer, find out more on Planning Portal
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