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Planning  Permission 

Do you really need planning permission? Every garden is unique but generally, garden rooms don't require planning permissions or building regulations. These type of home improvements are considered to be permitted developments, however, they are subject to the following limits and conditions:


  • The total area of ground covered by outbuildings cannot exceed 50% of the total area of the curtilage.

  • Outbuildings cannot be located in front of the building line of the principal elevation.

  • Outbuildings cannot extend beyond the side elevation of the house when the development would be any closer to a highway than the existing house, or at least 5 metres from the highway – whichever is nearest.

  • Any part of the development within 2 metres of a boundary of the house cannot exceed a height of 2.5 metres.

  • Any part of the development within 2 metres of the house cannot exceed a height of 1.5 metres.



  • Outbuildings cannot exceed more than one storey.

  • The height of an outbuilding cannot exceed 4 metres when the building has more than one pitch (e.g. dual pitch and hipped roofs)

  • The height cannot exceed 3 metres when the building has a single pitch or another roof form.

  • Flat roof buildings cannot exceed 2.5 metres in height.

  • The eaves height of the building cannot exceed 2.5m.


If your property is situated within a National Park, an area of outstanding natural beauty or a conservation area, the following restrictions also apply:

  • The total area of ground covered by outbuildings situated more than 20 metres from any wall of your dwelling cannot exceed 10 square metres.

  • No development can take place on land between the side elevation of the existing dwelling and the side boundary of your property.


Listed buildings

You will need to apply for planning permission for construction of, or amendments to, any outbuildings within the curtilage of a listed building.

Removal of permitted development rights

You need to be aware of whether the permitted development rights have been removed from your property by the Local Planning Authority. 

The Welsh government has produced some handy guides to explain planning permission and permitted development they can be found here.

A guide to building regulations for outbuildings can be here.

We are happy to advise on planning however it is the homeowner’s responsibility to ensure that the project does not require planning permission or building regulations. If you are in doubt about your proposed project and planning regulations, it is advised to take professional advice from a consultant. We work with a local planning consultant and are happy to pass his details to you. 


*Information extracted from the Welsh Government website. 

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