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Do I Need Planning Permission?

(N.B Different planning authorities may differ in their interpretation of Planning Laws and this advice cannot be considered binding.)

Loft Extensions
The proposed extension or dormer window should not be raised above the highest part of the roof.

  • The slope of any part of the roof which faces a highway must not be extended.
  • The proposed extension must not be more than 40 cubic metres in volume if it is a terraced house, or more than 50 cubic metres for other houses. These measurements are included in the total amount of volume allowed for all extensions. They are not additions.
  • A loft extension must have sufficient condensation control systems put into place to prevent mould growth on walls and furnishings within the property.