Loft conversion permitted development – loft conversions can be built within permitted development rights law
Permitted development – your right to develop your home
Since October 2008 a loft conversion is considered to be permitted development, not requiring an application for planning permission. Permission is required if you extend or alter the roof space and it exceeds specified limits and conditions. The permitted development limits and conditions are:
A volume allowance of 40 cubic metres additional roof space for terraced houses*
A volume allowance of 50 cubic metres additional roof space for detached and semi-detached houses*
No extension beyond the plane of the existing roof slope of the principal elevation that fronts the highway
No extension to be higher than the highest part of the roof
Materials to be similar in appearance to the existing house
No verandas, balconies or raised platforms
Side-facing windows to be obscure-glazed; any opening to be 1.7m above the floor
Roof extensions not to be permitted development in designated areas which include national parks and the Broads, areas of outstanding natural beauty, conservation areas and world heritage sites.
Roof extensions, apart from hip to gable ones, to be set back, as far as practicable, at least 20cm from the original eaves
The roof enlargement cannot overhang the outer face of the wall of the original house
* Please consider any previous roof space additions. They must be included within the volume allowances listed. Although you may not have created additional space a previous owner may have done so.