Any object or structure fixed to a listed building is also protected and this can include extensions (including modern additions), walls, porches and outbuildings.
Mae unrhyw wrthrych neu strwythur sy'n gysylltiedig ag adeilad rhestredig hefyd wedi'u gwarchod a gall hyn gynnwys estyniadau (gan gynnwys ychwanegiadau modern), waliau, portshys ac adeiladau allanol.