Bathroom Regulations & Practicalities
Bathrooms sit at the junction of water, electricity and other people's flats — so more regulation applies than most people expect. These answers cover what is actually required, what is merely recommended, and the paperwork a buyer's solicitor will one day ask to see.
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.
Read the full answerDo I need planning permission for a bathroom?
Almost never. Planning permission governs a building's external appearance and use, not its internal rooms — a bathroom renovation, a new en-suite, even moving a bathroom entirely needs no planning application in an ordinary house. The exceptions: listed buildings, and flats whose lease requires the freeholder's consent.
Read the full answerDo bathroom electrics need to be certified?
Yes — bathrooms are 'special locations' under the wiring regulations, and most electrical work in them is notifiable under Part P. The room is divided into zones dictating what can be installed where, and the work must end in a certificate. Uncertified bathroom electrics are the classic house-sale snag.
Read the full answerDoes a bathroom need an extractor fan?
New or renovated bathrooms need extraction to Building Regulations Part F — 15 litres per second intermittent, ducted to outside air. An openable window alone satisfies the letter for some existing rooms, but in practice every south London bathroom we refit gets a proper ducted fan: it is the single biggest mould preventer there is.
Read the full answerCan a bathroom have no window?
Yes — entirely legal and extremely common in London flats and new en-suites. Building regulations require ventilation, not daylight: a windowless bathroom needs mechanical extraction (15 l/s, ducted outside), and good ones add design compensations — layered lighting, large mirrors, and light finishes.
Read the full answerCan you move a soil pipe?
Yes, but it is the most consequential move in bathroom design: soil pipes need 110mm bore, continuous fall, and a route to the stack — so every metre moved costs real money and headroom. Moving a WC a short distance along the same wall is routine; crossing the room, or the house, is a project decision.
Read the full answerDo I need freeholder consent for a bathroom in a flat?
Usually, yes — most leases require a licence to alter for works touching services, waterproofing or floor build-up, which a bathroom renovation nearly always does. It is a contract question, not a council one, and starting without consent risks having to undo finished work. We produce the licence pack as part of the job.
Read the full answerWhat is a Disabled Facilities Grant?
A means-tested council grant of up to £30,000 in England for home adaptations a disabled person needs — level-access showers are the most common award. Applications go through your borough, usually after an occupational therapist assessment; children's applications are not means-tested. Start early: the process takes months.
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