For this project, the client wanted to convert the loft, but there had already been a number of extensions. The Permitted Development allowance for roof conversions on semi-detached houses is 50m3. The hip-to-gable conversion and rear dormer volumes, along with the roof volume of the new side extension had to be added to the existing roof space to ensure these didn’t exceed 50m3. This needed to be accurately modelled and then proved to the planning authority.
Separate applications were then required for the loft extension and side extensions as the loft was permitted development and the extension needed planning permission.
c.£115,000 + vat
PPA Architecture Ltd
Structural Engineers: THB Consulting Engineers