- Less than 1,000 square metres of floor space, and
- Less than 25 per cent of the volume of the original building, and
- Below the height of the original building
If you are extending or altering a listed building or a building in a conservation area, you may require planning permission as well as listed building and conservation area consent before you proceed with any works.
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.