Best to ask your local planning authority. No-one here can give you a proper answer. Why do you come here? It's the LPA who are in charge. Is it your proposal, or is it your neighbour's? Has it yet been built, or is it just proposed? Is it on a Listed Building? Too many unknown factors, which the LPA would know all about, but no-one here has a clue.
Probably. Permitted developments only apply if the window will not protrude more than 15cm above the roof’s plane. Best ask the local council to be sure.