Before 1 April 2023, use the Find a Business Rates Valuation Service on GOV.UK to tell the VOA about changes to your property details (such as floor area sizes and parking).
Cyn 1 Ebrill 2023, defnyddiwch y Gwasanaeth Darganfod Prisiad Ardrethi Busnes ar GOV.UK i roi gwybod i'r VOA am newidiadau i fanylion eich eiddo (megis maint arwynebedd llawr a pharcio).