Do I need Planning Approval for a detached garage in Wales

Detached Garage Planning Permission - Wales

Do I need Planning permission or Building Control approvals?

To help you understand these issues we detail below some of the "conditions" attached to planning permission and Building Regulations. (These apply to Wales only) England, Scotland, Northern Ireland and Ireland regulations are quite different - You should in all instances take local advice.

Do I need permission for a Detached Garage?

You will need to apply for planning permission if any of the following cases apply on the land around your house.

  • 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 (eg dual pitch and hipped roofs)
  • the height cannot exceed 3 metres when the building has a single pitch or other roof form
  • flat roof buildings cannot exceed 2.5 metres in height
  • 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.

If the work you are carrying out involves making a new access, or the alteration of an existing access to a trunk or classified road, you will need planning permission, not only for the access but also for the development.



Domestic single storey detached garage up to 30 sq meters are exempted under BUILDING AND BUILDINGS ENGLAND AND WALES The Building Regulations 2000, the rules are listed below.


Building a detached garage up to 30 square metres floor area would not normally need building regulations approval if:

  • the floor area of the detached garage is less than 15 square metres.
  • the floor area of the garage is between 15 square metres and 30 square metres, provided the garage is at least one metre from any boundary, or it is constructed from substantially non-combustible materials.



All garages built of brick or block walls and have a tiled roof are considered to be substantially of non-combustible material. Flat roof garages can also be substantially of non-combustible material when the roof is covered with 12.5mm limestone chippings.