500 square metres in respect of development within a conservation area, national Park, areas of outstanding natural beauty or within a World Heritage Site, or 1,000 square metres in any other case.
500 metr sgwâr yn achos datblygiad mewn ardal gadwraeth, parc cenedlaethol, ardaloedd o harddwch naturiol eithriadol neu ar Safle Treftadaeth y Byd, neu 1,000 metr sgwâr mewn unrhyw achos arall.