We are doing a dormer conversion on our chalet bunglow front and back(It already has small dormers at front and back . We have planning permission for the front and have architects drawings for this part. We are doing the rear conversion under permitted development and at present only have sketches. I was wondering whether I should get a structural engineer now involved for drawings or whether a builder would have access to one he could work with. I am not exactly sure what happens next. Any advice would be appreciated.
Steve