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Loft conversions | Loft conversion types | Loft conversion examples | Loft conversion planning permission
Is my roof space suitable for a loft conversion | Cost of loft conversions | Loft conversion design

Loft conversion planning permission

Planning applicationPlanning permission for loft conversion is not normally required. However, permission is required where you extend or alter the roof space and it exceeds specified limits and conditions.

  • A volume allowance of 40 cubic metres for terraced houses.
  • A volume allowance of 50 cubic metres for detached and semi-detached houses.
  • If your property fronts a highway, you cannot extend beyond the roof plane which 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 such as 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 eaves.

Providing you meet the criteria (set out above), you can enlarge your loft by up to 40 cubic metres in the case of a terraced house and 50 cubic metres in the case of a semi-detached and detached house without the need for planning permission.

With roof alterations, the emphasis is very much on appearance and this is reflected in the above criteria. Materials used have to be similar to the existing, the alteration cannot exceed the height of the existing roof and you cannot introduce a veranda, balcony or raised platform into the scheme without it needing planning permission.

If you are unsure if your loft conversion project will require a planning permission, please get in touch with us and we will be able to help you with free advice and online quotation.

Case studies & design examples

Browse the links and images below and find inspiration and new ideas for planning your own home improvement & loft conversion project.

Loft conversion and house refurbishment
Loft conversion and complete house refurbishment in Hopefield Avenue, London
loft conversion in Battersea, London SW11
Loft conversion in Battersea, London SW11

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Reg. Office: 2nd Floor, 145-157 St. John Street, London, EC1V 4PY
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