Mae’r Bil hefyd yn cynnig y dylid cynnal adolygiad ffiniau llawn ar ôl etholiad Senedd 2026. Daw hyn i rym o etholiad Senedd 2030 ymlaen, a bydd adolygiadau’n cael eu cynnal bob wyth mlynedd. Bydd Comisiwn Ffiniau a Democratiaeth Leol Cymru yn cael ei addasu a’i ailenwi yn Gomisiwn Democratiaeth a Ffiniau Cymru gyda’r swyddogaethau angenrheidiol i adolygu ffiniau etholaethau’r Senedd.
The Bill also proposes a full boundary review should take place after the 2026 Senedd election. This will take effect at the 2030 Senedd election, with reviews every eight years. The Local Democracy and Boundary Commission for Wales will be repurposed and renamed – to be known as the Democracy and Boundary Commission Cymru with the functions necessary to undertake reviews of Senedd constituency boundaries.