Conservatories and planning permission

Under current planning laws you may not require planning permission for your conservatory providing you meet with the following conditions:

Detached Properties

You are allowed to develop up to 70m3 or 115% of the total volume of the dwelling whichever is greater. However, this is a combination of the total amount of extensions, So if you have had a kitchen extension of 40m3 and require a conservatory of 41m3 this would total 81m3 and planning permission would be required. Should the total be less than 70m3, or 115% of the volume of the dwelling, planning permission may not be required.

Semi-Detached Properties

The same as detached properties, you are allowed to develop up to 70m3.

Terraced or End of Terrace Properties

Same as detached and semi-detached, but only 50m3 is allowed to be developed.

Flats or Maisonettes

This type of property has no permitted development rights and in all cases planning permission will apply, there are no exceptions.

The above mentioned only applies to extensions erected after the 1 July 1948.

Here are some additional points you need to consider. Planning permission is needed :

  1. If you build within 2m of the boundary line and the highest point at that junction is 4m or more high.
  2. If your conservatory covers more than 50% of the original garden.
  3. If your planning development rights have been removed.
  4. Grade II listed buildings. These may require a hardwood conservatory with a glass roof.
  5. Where a conservatory is 20m or less from a road or public footpath.