Loft Conversion

We are going to design a loft conversion soon. We are feeling existing and getting inspired :)

Note from a Planning Portal:

Planning permission is not normally required. However, permission is required where you extend or alter the roof space and it exceeds specified limits and conditions. A loft conversion for your house is considered to be permitted development, not requiring an application for planning permission, subject to the following limits and conditions:


  • A volume allowance of 40 cubic metres additional roof space for terraced houses*
  • A volume allowance of 50 cubic metres additional roof space for detached and semi-detached houses*
  • No extension beyond the plane of the existing roof slope of the principal elevation that 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**
  • Roof extensions, apart from hip to gable ones, to be set back, as far as practicable, at least 20cm from the original eaves