In most cases you will not need planning permission to erect a garden room – if the eaves height is under 2.5 and it doesn’t project beyond the front wall of your house
In general, adding a stand-alone, single storey garden room to the rear or side garden is usually allowed under Permitted Development.
However, we recommend that you check the Government’s Planning Portal online before starting any work on a garden room to ensure you comply with the rules
The planning portal refers to a garden room as an outbuilding.
Outbuildings are considered to be permitted development, not needing planning permission, subject to the following limits and conditions:
- No outbuilding on land forward of a wall forming the principal elevation.
- Outbuildings and garages to be single storey with maximum eaves height of 2.5 metres and maximum overall height of four metres with a dual pitched roof or three metres for any other roof.
- Maximum height of 2.5 metres in the case of a building, enclosure or container within two metres of a boundary of the curtilage of the dwelling.
- No verandas, balconies or raised platforms.
- No more than half the area of land around the “original house”* would be covered by additions or other buildings.
- In National Parks, the Broads, Areas of Outstanding Natural Beauty and World Heritage Sites the maximum area to be covered by buildings, enclosures, containers and pools more than 20 metres from house to be limited to 10 square metres.
- On designated land* buildings, enclosures, containers and pools at the side of properties will require planning permission.
- Within the curtilage of listed buildings any outbuilding will require planning permission.
– Government Planning Portal
Read more on the Government Planning Portal Website here.
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