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.
Choosing a bathroom suite
A close-coupled toilet is the standard, affordable choice. A wall-hung toilet looks sleeker and is easier to clean around but needs a concealed cistern built into the wall, adding cost and reducing space behind the wall for other services. Similar trade-offs apply to countertop vs inset basins.
Planning an en-suite bathroom
Adding an en-suite usually means extending plumbing and sometimes electrical circuits into a new area, and ventilation (an extractor fan, by regulation) becomes more important in a smaller enclosed space. Worth planning the layout around existing pipe runs where possible to control cost.
Mirrors and lighting for a functional bathroom
A backlit or demister mirror avoids the fogging that makes a plain mirror less useful straight after a shower. Positioning main lighting to avoid casting shadows across the mirror (for shaving, makeup) is a small detail worth discussing with your fitter rather than leaving to a single central ceiling light.
Why waterproofing (tanking) matters
Tanking is a waterproof membrane applied behind tiles, particularly around showers and baths, to stop water getting into the wall or floor structure below. Skipping this step is a common cause of hidden damp and rot that only becomes visible years later — worth confirming it's included, not assumed, in a refit quote.
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.
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.
How long does a bathroom refit take?
A fixture swap (like-for-like toilet or basin) is usually a day or two. A full bathroom refit including tiling and waterproofing commonly takes 1-2 weeks, and it's often the only bathroom in the property out of use for that period — worth planning around if you only have one.