Single storey extensions must not extend beyond the rear wall of your house by more than 4 metres, and cannot exceed 4 metres in height.
ni chaiff adeiladau allan ymestyn y tu hwnt i ochr y tŷ pe bai’r datblygiad yn agosach i’r briffordd na’r tŷ presennol, neu dylai fod o leiaf 5 metr o’r briffordd – pa un bynnag sydd agosaf