The enlargement, improvement or other alteration of a dwelling house.
Adding a conservatory to a house is considered to be a development not requiring an application for planning permission, provided the below conditions are adhered to:
1.On designated land cladding of any part of the exterior of a dwelling (and extensions/ conservatories) with stone, artificial stone, pebble dash, render, timber, plastic or tiles is not a permitted development.
*Designated land includes national parks and the Broads, Areas of Outstanding Natural Beauty, conservation areas and World Heritage Sites.
2. On designated land conservatories extending beyond any side wall of the original house are NOT a permitted development.
3. Conservatories (including previous extensions) and other buildings must not exceed 50% of the total area of land around the original house. The term ‘original house’ means the house as it was first built, or as it stood on 1 July 1948, if it was built previous to this date. Although you may not have built an extension to the house, a previous owner may have done so.
*Sheds and other outbuildings must be included when calculating the above 50% limit
4. Conservatories forward of the principal elevation or side elevation of the original house and fronting a highway are NOT permitted development.
5. Side conservatory must not have a width greater than half the width of the original house.
Again, 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). Remember that although you may not have built an extension to the house, a previous owner may have done so.
6. Side conservatories to be single storey only, with a maximum height of four metres.
7. If conservatory (at side or rear) is within two metres of a boundary maximum eaves height should be no higher than three metres to be a permitted development not requiring a planning application.
8. Single-storey rear conservatory must not extend beyond the rear wall of the original house by more than three metres if an attached house or by four metres if a detached house.
9. Single-storey rear conservatory must not exceed a height of four metres.
10. Maximum eaves height should be no higher than the eaves of the existing house. The highest part of the conservatory should be no higher than the roof ridge line of the existing house.
The permitted development allowances described here apply to houses, not flats, maisonettes or other buildings.
You should check with your Local Planning Authority whether permitted development rights apply – they may have been removed by what are known as Article 4 directions.
Other consents may be required if your house is listed or in a designated area.
As well as other important information you will find guidance here on the permitted development regime.
WALES: This guidance relates to the planning regime for England. Policy in Wales may differ.
Contact your local planning authority for further information.
BUILDING REGULATIONS: Conservatories are normally exempt from building regulations provided they meet a number of conditions. For more information read Planning Portal online guidance here:
‘Original house’ - 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’ - Designated land includes national parks and the Broads, Areas of Outstanding Natural Beauty, conservation areas and World Heritage Sites.
DISCLAIMER: Users should note that this is an introductory guide and is not a definitive source of legal information.
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