Asiantaeth y Swyddfa Brisio sy’n cynnal y broses ailbrisio. Mae’n ailasesu pob gwerth ardrethol yng Nghymru a Lloegr ar sail y rhent a fyddai’n cael ei godi amdanynt ar y farchnad agored ar ddyddiad penodol. Dyma’r ailbrisiad cyntaf o’i fath yng Nghymru ers 2010.
Revaluation is carried out by the Valuation Office Agency (VOA) and reassesses all rateable values in Wales and England based on their open market rental value on a fixed date. This is the first such revaluation in Wales since 2010.