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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
A shed is classed as an outbuilding which falls under permitted development rights, meaning that it does not require an application for planning permission. They can be built in conservation areas provided they meet the limits set out in legislation.
Specifically on protected land, including conservation areas, no part of the outbuilding can be on the side or front elevation of the house.
A full list of limits and conditions can be read on our outbuildings common project.
An application for full planning permission for a change of use is often required when changing from a house (use class C3) to a residential institution (use class C2). This is due to the increased activity which a C2 use would have on the local street area through the addition of visitors, staff and changes to parking.
Read additional information on use classes and changes of use.
Installing a new septic tank in your garden will often require both planning permission, building regulations approval and a septic tank permit.
The planning permission will ensure that the tank is installed in an appropriate location with information being provided to understand any potential implications for the surrounding environment and water.
Building regulations is required for the installation of a septic tank to ensure it meets the drainage and waste disposal standards set out in Approved Document H.
Where possible it is recommended that you connect to an existing public sewer instead of installing a septic tank, this reduces waste entering the waterways.
For more information visit our drains common project or contact your local planning authority.
Building above an attached garage is treated the same as adding a storey to the rest of your home. This is considered to be permitted development, not requiring an application for planning permission provided you meet the set rules and requirements.
You will still need to submit an application for prior approval to your local planning authority.
Read the list of rules and requirements for extending upwards.
Adding a porch canopy is classed as permitted development provided it meets the limits and conditions set out in legislation. Where this is the case, no application for planning permission is required.
Porches must meet the following limits:
- the ground floor area (measured externally)would not exceed three square metres.
- no part would be more than three metres aboveground level (height needs to be measured in the same way as for a house extension).
- no part of the porch would be within two metres of any boundary of the dwellinghouse and the highway.
Read our mini guide for additional information on installing a porch.
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