A loft conversion for your house is considered to be permitted development, not requiring an application for planning permission, provided certain limits and conditions are met.
1. Loft conversions are NOT permitted development for houses on designated land*.
2. To be permitted development any additional roof space created must not exceed these volume allowances:
* 40 cubic metres for terraced houses.
* 50 cubic metres for detached and semi-detached houses.
Bear in mind that any previous roof spaceadditions must be included within this volume allowance. Although you may not have created additional space a previous owner may have done so.
3. An extension beyond the plane of the existing roof slope of the principal elevation that fronts a highway is NOT permitted development.
4. Materials to be similar in appearance to the existing house.
5. No part of the extension to be higher than the highest part of the existing roof.
6. Verandas, balconies or raised platforms are NOT permitted development.
7. Any side-facing windows must be obscureglazedand non-opening unless the parts
which can be opened are more than 1.7 metres above the floor of the room in which it is installed.
8. Roof extensions, apart from hip togable ones, to be set back, as far as is practicable, at least 20cms from the eaves.
9. Work on a loft or a roof may affect bats.You need to consider protected species when planning work of this type. A survey may be needed, and if bats are using thebuilding, a licence may be required.
* Contact Natural England for more advice.
* Designated land includes national parks andthe Broads, Areas of Outstanding Natural Beauty, conservation areas and World Heritage Sites.
Crown Copyright©2011 Reproduced with permission