However, if the building is listed or is in a conservation area (or other designated area) you should consult with your local planning authority.
Fodd bynnag, os yw’r adeilad wedi’i restru neu os yw mewn ardal gadwraeth (neu ardal ddynodedig arall), dylech ymgynghori â’ch Awdurdod Cynllunio Lleol.