Two regimes
England and Wales are close, but not the same.
Wales built its own regime rather than adopting the English one. If you work across the border, the differences are the part that catches people out.
| England | Wales | Why it matters | |
|---|---|---|---|
| Higher-risk definition | At least two residential units | A single residential unit is enough | Buildings that fall outside the English definition are caught in Wales. |
| Approvals | Building Safety Regulator | Local authority building control | Different route, different relationships, different timelines. |
| Works to existing buildings | Independent sections possible | No independent sections | One qualifying part can pull the whole building into scope. |
| In force since | October 2023 | 1 July 2026 | Welsh projects are at the beginning of the curve. |
How TBM handles it
Every rule in the platform carries a jurisdiction and a citation. Every building carries the regime that applies to it. Nothing is assessed against the wrong set of rules because a default was assumed.
Where a rule has not been confirmed against a published source, the platform says so rather than filling the gap with something plausible.
This page is a summary written to be useful, not a statement of law. Check anything that matters with a competent person before relying on it.