Planning Portal

Home owners: Work on the roof

EXTENSIONS CONSISTING OF AN ADDITION OR ALTERATION TO A ROOF

Roof lights, dormer windows or other roof extensions

Planning permission is not required provided that:
1. No part of the roof light, dormer or extension is higher than the highest part of the existing roof.
2. No part of the roof light, dormer or extension projects by more than 15 centimetres in front of any existing roof slope of the house which faces onto a road and forms the principal or side elevation of the house.
3. No part of the roof light, dormer or roof extension is any closer than 0.5 metres to the roof ridge, eaves or any party wall or verge.
4. The materials used in any exterior work are of similar appearance to those used on the existing house.
5. Any window on a side elevation within 15 metres of a boundary with another house is obscure glazed; and is non – opening unless the parts which can be opened are more than 1.7 metres above the floor of the room in which the window is installed.
6. Your house is not in a conservation area.
Illustration 1: Rear dormer not requiring planning permission
Illustration 1

Roof space conversion

The internal alterations to convert a roof space to provide additional living accommodation do not require planning permission. However, installing dormer windows, inserting roof lights or carrying out other works to alter the roof may need permission – particularly if the roof slope faces onto a road and forms the principal or side elevation of the house (see "Roof lights, dormer windows or other roof extensions" above).

Re-roofing a house

Planning permission is not required providing that the height of the roof is not increased and the materials used are of similar appearance to those of the existing roof.
If you live in a house which is a listed building, it is likely that you will need Listed Building Consent for any building operations. If the development is within the curtilage of a listed building you may need to submit a planning application for the work unless listed building consent has already been granted. Your local planning office will be able to advise you.
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