Wales sets 1 July 2026 for Building Safety Act reforms

If you design, build, inspect or manage buildings in Wales, circle 1 July 2026. That is when the Welsh Government will switch on the next set of powers in the Building Safety Act 2022 for Wales. Think of a commencement regulation as the calendar date that makes parts of a law “live” for real projects and real decisions. The regulations were made on 12 December 2025 and signed by Cabinet Secretary Rebecca Evans MS.

What actually changes for you from that date? Four practical tools move from paper to practice. First, building control bodies gain express powers to issue compliance notices and stop notices. Second, the offence of breaching building regulations is strengthened, including the prospect of imprisonment in serious cases. Third, approvals that sit unused will start to lapse after three years. Fourth, if a local decision stalls on certain higher‑risk applications, the Welsh Ministers can step in and determine it, and they also have updated “default” powers if a local authority persistently under‑performs.

Let’s break down those notices. A compliance notice tells a person what must be put right and by when if work appears to breach building regulations. A stop notice can pause specified work immediately if the risk is serious or if a compliance notice has been ignored. Ignoring either notice is a criminal offence, with penalties that can include fines and, in some cases, imprisonment. These powers sit in sections 35B–35D of the Building Act 1984 as inserted by section 38 of the 2022 Act.

Breach of building regulations becomes a tougher offence. Under section 39 of the 2022 Act, the old fine‑only, summary‑only route is replaced: cases can go to the Crown Court, with maximum sentences of up to two years’ imprisonment or an unlimited fine. The daily “continuing offence” fine also remains for ongoing non‑compliance. The window for councils to require unsafe work to be altered is extended to ten years, aligning enforcement with longer project timelines.

Approvals won’t sit on the shelf. Section 36 introduces a three‑year “use it or lose it” rule: if work covered by a building control approval, initial notice or plans certificate has not started within three years, that permission lapses. On multi‑building sites, the rule can bite building‑by‑building. This keeps live permissions aligned with today’s safety standards rather than yesterday’s drawings.

If a prescribed higher‑risk application is left undecided within the required timescale, applicants will be able to ask the “appropriate national authority” to decide it. In Wales that is the Welsh Ministers. This safety valve is designed to prevent drift on complex cases where delays themselves can carry risk.

There is also a backstop for weak enforcement. Section 45 updates the default powers so that, where a local authority persistently falls short and puts people at risk, Welsh Ministers can declare the authority in default and transfer specified building control functions. This acknowledges that most work happens locally, but ultimate responsibility for public protection sits nationally.

Where does 1 July 2026 sit in Wales’s wider reform timeline? Earlier steps mattered. On 5 September 2023, Wales brought in dutyholder roles and competence requirements for industry and set up the framework for notices and enforcement. From 6 April 2024, Wales ran the transition to the new building control profession, with local authorities overseeing new higher‑risk building work and Registered Building Control Approvers taking on defined roles. The profession’s detailed rules came into force on 1 January 2025.

So, what does this mean for your classroom, office or site? For students and trainees, this is a live case study in how a law phases in: Parliament writes the powers, Wales sets the start dates, and building control uses the tools. For contractors and designers, it’s time to check your quality assurance, record‑keeping and escalation routes so you can respond quickly to any compliance or stop notice. For councils, training your teams on evidence standards for notices and on the three‑year lapse rules will make enforcement fair and consistent.

Finally, place this in the bigger Welsh programme. Ministers have been updating rules, guidance and the building control workforce while preparing a separate Building Safety (Wales) Bill to cover the occupation phase. The direction of travel is clear: stronger oversight from design through to lived‑in buildings, with clearer accountability at each step. That is the context for the 1 July 2026 switch‑on.