This Practice Note considers the Building (Higher-Risk Buildings Procedures) (Wales) Regulations 2025, SI 2025/1321 (the Welsh Regulations). It explains what the Welsh Regulations are for, what counts as an HRB in Wales (‘adeilad risg uwch’), how the Welsh procedural regime operates in practice, and the principal obligations imposed on clients, principal designers and principal contractors. It also considers the gateway-style approval process, change control, commencement and completion requirements, transitional provisions, and the consequences of non-compliance. It provides practical guidance for construction lawyers advising on HRB work in Wales. The Welsh Regulations bring into force the detailed procedural regime governing the design, construction and completion of HRBs in Wales. They give practical effect, in the Welsh building control context, to the HRB regime created under Part 3 of BSA 2022. Although the regime is broadly aligned with the system operating in England, it is not simply a copy. In Wales, the procedural framework is integrated into the local authority building control system, and that creates practical differences: