What affects the cost of a bathroom renovation

We do not quote a bathroom renovation without seeing the room, because the same size bathroom can be two very different jobs depending on what is actually involved — and the price range you see quoted generally elsewhere reflects that spread rather than any one fixed figure. What follows are the actual factors that move the number, in the order they tend to matter.

Whether the layout is changing

Swapping a toilet, basin and bath for the same items in the same positions is the cheapest version of a bathroom job, because none of the pipework beneath the floor needs to move. The moment a toilet moves to a different wall, or a bath is swapped for a shower on a different side of the room, waste pipes need a fall recalculated and re-routed — the single biggest jump in cost on most renovations, and it has nothing to do with the fittings chosen.

Whether it is becoming a wet room or level-access shower

A full wet room needs the floor built up to a fall and properly tanked, which is a different scope of work to tiling over an existing floor — see wet rooms and walk-in showers for what that actually involves and why the waterproofing, not the shower itself, is what decides most of the cost here.

What is found once the old bathroom comes out

Old lead pipework, a rotten floor joist under a leaking shower tray that has been quietly leaking for years, or a concealed cistern with a seized valve behind the wall — none of this is visible before the strip-out, and any of it can add real cost once uncovered. We would rather flag this as a possibility up front than pretend every quote is final before the walls are open.

The fittings themselves

This is the part people expect to matter most, and it does move the number, but usually by less than the three factors above. A concealed cistern versus a close-coupled one, a walk-in shower versus a bath, or a heated towel rail versus a standard radiator all have a real cost difference, but it is a smaller lever than whether the pipework is moving at all.

Getting an accurate number

The only way to get a genuinely accurate figure is a look at the actual room and what is being changed — see bathroom installation for what we cover, and we will always agree the price before work starts rather than after.