Dormer Windows

Conditions

Permission will be required for a dormer window in a residential property if at least one of the following circumstances apply:

The property is a flat.
The property is a Listed Building.
The property is in a Conservation Area.
The window is on a roof slope that faces onto a highway.
The cubic capacity of the conversion exceeds 50 cubic metres for a detached or semi-detached house or 40 metres for a terraced house.
Part of the dormer window is higher than the highest part of the roof.
If the dwelling has been previously extended, the cubic content of the window added to the cubic content of the extension must not exceed 50 cubic metres or 10% of the original dwelling, whichever is greater. This applies to a terraced house. For a detached or semi-detached house, the limit is 70 cubic metres or 15% of the original dwelling.
There is a specific planning condition attached to a previous planning consent that restricts permitted development rights.

If in any doubt about whether or not permission is required, please email planning.control@darlington.gov.uk or contact the planning duty officer on 01325 388361.
If you wish to receive a formal letter stating whether or not planning permission is required for your proposed development, please see Permitted Development Enquiries.
If any structural work is involved, Building Control Consent may also be required. This is entirely separate from Planning (see Planning compared to Building Control).