The VOA is responsible for the valuation and listing of hereditaments for NDR, including the consideration of proposals from ratepayers who believe their valuation should be changed.
Mae Asiantaeth y Swyddfa Brisio yn gyfrifol am brisio a rhestru hereditamentau ar gyfer ardrethi annomestig, gan gynnwys ystyried cynigion gan drethdalwyr sy'n credu y dylai eu prisiad gael ei newid.