Ym mis Mawrth 2021 gwnaed Rheoliadau a oedd yn darparu ar gyfer sefydlu pedwar Cyd-bwyllgor yng Nghymru, yn ogystal â sicrhau gofynion goruchwylio, rheoli ac ymddygiad priodol o’r dechrau ar gyfer y Cyd-bwyllgorau a’u haelodau. Cymeradwyodd y Senedd ddwy set arall o is-ddeddfwriaeth ym mis Tachwedd 2021 a mis Mawrth 2022, a oedd yn darparu ar gyfer agweddau ar y fframwaith deddfwriaethol ar gyfer y Cyd-bwyllgorau.
In March 2021 Regulations were made which provided for the establishment of four CJCs in Wales, as well ensuring that CJCs and their members were subject to appropriate oversight, management and conduct requirements from the start. Two further tranches of secondary legislation were approved by the Senedd in November 2021 and March 2022, which provided for aspects of the legislative framework for CJCs.