Do I need building regulations approval for a new bathroom?
A like-for-like refit needs no approval. But new drainage connections (Part H), ventilation changes (Part F), structural work and most bathroom electrics (Part P) are all controlled — so a renovation that moves the WC, adds an en-suite or rewires the room does engage building regulations, usually via installer self-certification.
The clean way to think about it: swapping objects is free of regulation; changing systems is not. New suite in the old positions — no approval needed. Move the soil connection, form a new bathroom where there was none, alter structure for a wetroom floor, or add circuits, and the relevant Parts apply: H for drainage, F for ventilation, P for electrics, A where structure is touched.
In practice, approval rarely means a council application. Competent-person schemes let registered installers self-certify: our electrical work is notified under Part P and generates a certificate automatically. A wholly new bathroom in a previously dry room (a new en-suite, say) is the case most likely to warrant a building-control application proper — and when it does, we make it.
Why it matters beyond legality: the certificates are what conveyancing solicitors request when you sell. Missing electrical certification for an obviously renovated bathroom triggers indemnity policies, retentions or price chips — all more expensive than doing the paperwork at the time. Every job we complete hands over its certificates as part of the finish, not as an optional extra.
More in regulations & practicalities, or browse all 38 questions on the FAQ index.
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