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.

Adding a conservatory to your house is treated the same as adding a single storey extension, and the same rules apply. Development of a conservatory is considered to be permitted development, not needing an application for planning permission, subject to the limits and conditions listed below:

  • No more than half of the area of land around the original house can be covered by a conservatory.
  • The conservatory cannot be higher than the height of the eaves of the existing dwellinghouse.
  • If your conservatory is located within 2 metres of a boundary of your house, the eaves height of the conservatory cannot exceed 3 metres.
  • Conservatories are not permitted development within the curtilage of a listed building.

Size of your conservatory

  • The length and height of your conservatory must be no more than 4 metres.  
  • For side conservatories, the width of your conservatory cannot be more than half of the width of the original dwellinghouse.  
  • Side conservatories have additional restrictions on size in conservation areas, national parks, areas of outstanding natural beauty or World Heritage Sites.  They may extend from the side elevation of the original dwellinghouse by no more than 3 metres and must be set back from the principal elevation of the original dwellinghouse by at least 1 metre.

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

Where work is proposed to a listed building, listed building consent may be required.

Please be aware that if your development is over 100 sqm, it may be liable for a charge under the Community Infrastructure Levy.

* 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.

* Designated land includes national parks and the Broads, Areas of Outstanding Natural Beauty, conservation areas and World Heritage Sites.

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.