Planning Permission

New regulations came into force on 30 September 2013 which changed the building work which can be done without needing to apply for planning permission. The Welsh Government has produced a technical guide, and a householder guide, available here, to help you understand how permitted development rules might apply to your circumstances.

Rules governing outbuildings apply to sheds, 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 structure for a purpose incidental to the enjoyment of the dwellinghouse.

Other rules relate to the installation of a satellite dish, the erection of a new dwelling or the erection or provision of fuel storage tanks.

Outbuildings are considered to be permitted development, not needing planning permission, 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 (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

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

Verandas, balconies and raised platforms

Verandas, balconies and raised platforms are not permitted where any part of the development would project more than 300mm above the surface of the ground below

*The term "original house" means the house as it was first built or as it stood on 1 July 1948 (if it was built before that date). Although you may not have built an extension to the house, a previous owner may have done so.

Please note: the permitted development allowances described here apply to houses not flats, maisonettes or other buildings. View guidance on flats and maisonettes here.

Disclaimer - Wales

This is an introductory guide and is not a definitive source of legal information. This guidance relates to the planning regime for Wales. Policy in England may differ. If in doubt contact your Local Planning Authority.

Read the full disclaimer here.