Hi, a quick question for those in the know. I live in a 1930s semi. My neighbour (detached side) has a two story extension with a flat roof that is built up to the boundry line (it was like that when we bought our house - no problem). They have now converted the roof to a pitched roof which now protrudes (slightly) over the boundry line and slopes towards us. Would planning permission have been required for this? I have checked the planning portal and I am still not sure. It does not extend higher than the rest of the house. Cheers.

