Bathroom Cost Calculator

Bathroom renovation costs sit in three broad bands. A basic refit that replaces the suite, re-tiles and keeps the existing layout runs £3,000 to £6,000. A mid-range project with a new suite, a full re-tile, updated plumbing and a heated towel rail comes to £8,000 to £15,000. A luxury finish involving a freestanding bath, a walk-in shower, underfloor heating and bespoke tiling starts around £15,000 and passes £25,000.

What pushes a bathroom up a band is rarely the taps. The biggest single driver is whether the layout changes, because moving waste pipes and water supply adds heavily to the plumbing bill. Next comes the specification of sanitaryware and tiling, then any structural work such as strengthening a floor to carry a cast-iron bath. A standard refit takes 1 to 2 weeks. Enter your bathroom size, specification level and scope, and the calculator estimates the suite, tiling, plumbing, electrics covering extractor fan, heated mirror and underfloor heating, flooring and labour. Electrical work in a bathroom must comply with Building Regulations Part P and be done by a qualified electrician.

Per square metre, most bathrooms work out at £1,500 to £4,000, and the Which? survey put the average British refit in 2026 at £6,500. The money splits roughly into 25% on the suite of bath, basin, WC and taps, 20% on tiles and walls, 20% on the 3 to 5 days of plumber and tiler labour, 15% on extras such as a heated towel rail and lighting, and 20% on finishing. That split makes a quote easy to sanity-check.

Suite prices span an enormous range. A bath is £150 to £1,500, from pressed steel enamel at the bottom to freestanding cast iron at the top. A shower enclosure with tray and frameless glass costs £200 to £2,000, a doorless walk-in shower £500 to £3,000 fitted, and a fully tanked level-floor wet room adds £3,000 to £8,000 on top of everything else. Basin and vanity units are £150 to £2,000, a WC £100 to £800 with concealed cisterns at the upper end, and taps and shower fittings £100 to £1,500. Bristan, Mira and Triton sit mid-range, with Hansgrohe, Grohe and Vado above them.

Tiling is where a modest budget can be stretched. Ceramic wall tiles cost £15 to £40 per m², porcelain £25 to £70 for better durability, natural stone such as marble or slate £40 to £120, and a mosaic feature £30 to £200. Large-format porcelain of 600 by 600 and upwards gives the most expensive-looking result for the money. Grout and adhesive add £100 to £300 for a typical room. Tiling to half height and painting above saves 30 to 40% against full-height tiling, though the shower zone must be tiled in full with water-resistant adhesive and epoxy grout.

Water pressure decides what shower you can fit. Mains pressure from a combi boiler is typically 1 to 3 bar in British homes, and a power shower wants at least 2 bar, so a low-pressure property needs a pump costing £200 to £500. A thermostatic mixer at £150 to £400 is a safety item rather than a luxury, because it stops boiler temperature spikes reaching you mid-shower. A heated towel rail is £50 to £500 plus £100 to £200 for the plumber, and electric underfloor heating at £40 to £80 per m² fitted adds £400 to £800 to the total.

Some savings cost nothing in quality. Budget tiles behind the toilet, plain white sanitaryware that stays easy to match years later, and B&Q or Wickes own-brand fittings at 50 to 60% less than designer equivalents all pass unnoticed. Spend the money instead on the shower mixer and valve, which is used daily and expensive to put right when it leaks, on tanking in wet areas, and on the tiles within reach every morning. An extractor fan with a humidity sensor costs £80 to £200 and heads off mould remediation running £500 to £2,000.