Planning Permission

However, planning permission is approved for a lot of dormer conversion on the initial application. Recently, the more relaxed permitted development rights enacted since 2015 have allowed families to have up to 75% more extension space without full planning permission, allowing twice the usual space allowed for single-storey rear extensions. Now, the easiest and the most likely to be accepted without planning permission are the roof lights that follow the pitch line of the roof. So the fact that you don't need planning permission does not mean that you do not have to adhere to the relevant building regulations, which are different to planning.