20cm rule

We are getting a rear loft built and I am confused about the 20cm set back rule, in particular on how it relates to the side of the house. We have a three-bed semi. The original roof sloped in from all three sides( hipped roof I believe in the technical jargon ). The roof has been removed...

Hi I am new to the forum but I have seen many helpful comments on other threads so appreciate if someone can guide me. I had a loft conversion done with a dormer about 2 years ago. I had involved an approved inspector from "Complete Building Control" to issue final certificate. The work was...