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.
Bathroom regulations, FAQ
Do I need building control sign-off for a bathroom refit? Usually not for a like-for-like refit, but new electrical circuits or moving significant plumbing may need it, handled via the relevant registered tradesperson. Can I do my own tiling? Yes, tiling itself isn't regulated — it's the electrics and plumbing behind it that are.
Choosing taps and shower valves
A thermostatic shower valve maintains a constant temperature even if water pressure elsewhere in the house changes (someone flushing a toilet, for example) — worth the extra cost over a manual mixer valve for most households. Tap finish (chrome, brushed nickel, matte black) is largely aesthetic but affects how easily fingerprints and limescale show.
Understanding the labour vs materials split
Tiles, the suite, and fittings are often a smaller share of the total cost than labour, particularly for a full refit involving tanking and tiling. A cheap quote is worth checking against the same fixture brands and tile spec as competing quotes, not just a lower labour rate.
Shower screens vs shower curtains
A glass shower screen looks cleaner and is easier to maintain long-term than a curtain, but costs more and needs to be fitted correctly to avoid water escaping at the edges. A curtain is the cheaper, more flexible option, particularly for an over-bath shower.
Bathroom plumbing work and WaterSafe
Moving or adding plumbing (a new shower, relocated toilet) should follow Water Fittings Regulations, the same rules a WaterSafe-registered plumber works to. If your bathroom fitter isn't a registered plumber themselves, ask who does the plumbing side and whether they're WaterSafe registered.
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.
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.