Permitted development is the best way to maximizing your potential space as planning permission will usually mean some constraints on the size of your conversion.

The following states the conditions for permitted development:

  • The house is a single family dwelling and not a flat or maisonette
  • The proposed extension or dormer window should not be raised above the highest part of the roof
  • Dormers can be built on the rear and hipped side when the slope of any part of the roof, do not face a highway. A ‘hip to gable’ is also permitted in the same circumstances.
  • The proposed loft conversion exceeds 40 cubic meters in the case of a terraced house or 50 cubic meters in any other case. (This is volume added externally with dormers etc.)
  • The property is not within a heritage or conservation area.



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