What affects the cost
Cost depends on whether pipework and electrics need moving (not just swapping fixtures in place), the tiling area, fixture quality, and whether structural changes are needed (like removing a bath for a walk-in shower). Moving a toilet's position, in particular, is one of the more expensive changes because of the soil pipe work involved.
Three steps to hiring the right bathroom fitter
First, ask to see photos of similar completed jobs, ideally local ones. Second, clarify exactly who does the electrical and plumbing work — the fitter directly, or a subcontracted registered tradesperson. Third, get a written quote that separates labour, fixtures and tiling.
Bathroom lighting and IP ratings
Lighting near water (over a shower, close to a bath) needs to meet a minimum IP (ingress protection) rating for that specific zone — not every light fitting is suitable everywhere in a bathroom. This is part of what a registered electrician checks as part of the notifiable electrical work.
KBSA and TrustMark, what they actually mean
The KBSA (Kitchen Bathroom Bedroom Specialists Association) is the main UK trade body for the sector, though membership is limited to a few hundred companies nationally, so it's not something every bathroom fitter will have. TrustMark is a broader government-endorsed scheme covering many trades — worth asking which, if either, your fitter holds, rather than assuming either is universal.
What a good bathroom quote should include
A proper quote should specify the suite brand/model (not just "a toilet, a basin"), whether tiling and waterproofing are included, whether electrical and plumbing work is covered directly or subcontracted, and what happens if hidden pipework issues are found once the old suite is removed.
Common bathroom fitting jobs
Bathroom fitters handle everything from a single fixture swap to a full refit: removing and replacing suites, tiling, waterproofing (tanking) around showers, and coordinating the plumbing and electrical work a refit needs. Many fitters manage the whole job themselves and bring in a plumber or electrician for specific parts.
How bathroom fitting quotes work
Describe the current bathroom's layout and what you want changed — an initial estimate can follow, but a firm price usually needs an in-person visit, since existing pipework position and floor/wall condition significantly affect scope once work starts.
Planning bathroom storage during a refit
Built-in storage (vanity units, recessed cabinets) is far easier to plan during a full refit than to retrofit afterwards, since it often needs coordinating with tiling and plumbing runs. Worth deciding on storage needs before the layout is finalised, not after tiling is complete.