Today this is through a rolling survey programme during which 10 per cent of assets are surveyed each year to a consistent assessment methodology.
Mae arolygon o gyflwr henebion cofrestredig yn cael eu cynnal drwy raglen dreigl o arolygon lle mae 10% o'r asedau'n cael eu harolygu bob blwyddyn gan ddefnyddio methodoleg gyson.