If the building is in a designated area, such as a conservation area, a national park, an area of outstanding natural beauty or the Broads, planning permission will be required.
Os yw’r adeilad mewn ardal ddynodedig, megis ardal gadwraeth, parc cenedlaethol, ardal o harddwch naturiol eithriadol neu’r Broads, bydd angen cael caniatâd cynllunio.