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.
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 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.
Heated towel rails, electric vs plumbed
A plumbed towel rail runs off the central heating system and only heats when the heating's on (unless dual-fuel with an electric element added). An electric-only rail can run independently year-round. Dual-fuel gives the most flexibility but costs more and needs both connections.
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.
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.
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.