Loft Conversions

Utilising the roof space may sometimes be the only method of adding usable and habitable space to a property, though it can be more expensive than a straightforward extension. In some cases a full planning application is not necessary and the work can be carried out as �permitted development� should the proposal be within the following constraints:

Dimensionally

For terraced houses, the volume should be under 40 cubic metres.
For detached and semi-detached, the volume should be under 50 cubic metres.

Site Context

Materials should match and be �in keeping� with the existing dwelling.
No verandas, balconies or raised platforms.
Side facing windows should have obscured glazing and be 1.7 metres above the floor level.

Positioning

No extension (by adding a dormer) should face the highway.
Roof extensions, apart from hip to gable, to be set back as far as practicable, at least 20cm from the original eaves.

Note: This information has been checked against the content on the Planning Portal Website.

Last modified: 26 August 2019.

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