Bydd y penderfyniad i restru’r adeilad yn dod i rym yn syth. Yn sgil hynny, bydd angen caniatâd adeilad rhestredig i ddymchwel neu newid yr adeilad, neu i’w estyn mewn modd a allai effeithio ar ei gymeriad fel adeilad o ddiddordeb pensaerniol neu hanesyddol.
The decision to list the building has immediate effect and introduces a requirement for listed building consent to demolish the building or alter, or extend it in a way which affects it character as one of special architectural or historic interest.