Fitting a new bathroom is one of the most cost-variable renovations in a UK home. A straightforward like-for-like replacement of sanitaryware in a small en-suite can be completed for under £5,000; a full wet room with underfloor heating, bespoke joinery, and natural stone in a large family bathroom can exceed £35,000. Understanding what drives cost — and what you are actually paying for — makes it much easier to set a realistic budget and identify where to spend and where to save.
The headline ranges: a basic new bathroom costs £4,500–8,000; mid-range £8,000–15,000; high-end £15,000–35,000+. These are supply-and-fit totals for a typical 4–6m² bathroom, excluding VAT.
What Drives Bathroom Cost
The single biggest cost driver is whether the plumbing needs to move. Replacing sanitaryware in the same positions is a straightforward plumbing exercise; relocating the bath to the opposite wall, moving the soil stack, or adding a shower where there was none requires significantly more pipework, structural consideration, and potentially Building Regs involvement.
Specification — the quality of tiles, sanitaryware, and fixtures — is the second major driver. Budget tiles at £20–40/m² versus natural stone at £100–200/m² represent a cost difference of £500–2,500 on a typical bathroom just in materials, before accounting for the additional installation time stone requires.
Access and condition are often underestimated. Old bathrooms frequently reveal hidden problems once stripped: rotted joists beneath the bath, inadequate waterproofing behind old tiles, failed plumbing connections. A contingency of 10–15% on top of the quoted price is sensible.
Cost Breakdown by Element
| Element | Basic range | Mid-range | High-end |
|---|---|---|---|
| Strip-out and disposal | £300–500 | £400–700 | £500–800 |
| Plumbing (supply and waste, like-for-like) | £800–1,200 | £1,200–2,000 | £1,800–2,500 |
| Plumbing (significant relocation / new circuits) | £1,500–3,000 | £2,500–4,500 | £4,000–8,000 |
| Electrics (Part P: lighting, extractor, towel rail) | £400–600 | £600–800 | £800–1,200 |
| Tiling (walls + floor, typical 10m²) | £800–1,400 | £1,200–2,500 | £2,000–5,000 |
| Tiles (materials, 10m²) | £200–400 | £400–1,200 | £1,200–3,000 |
| Bath (supply) | £200–500 | £500–1,200 | £1,200–4,000 |
| Bath installation | £150–250 | £200–350 | £250–500 |
| Shower enclosure and tray (supply) | £250–600 | £600–1,500 | £1,500–5,000 |
| Shower installation | £150–300 | £250–400 | £350–700 |
| WC pan and cistern (supply) | £100–250 | £250–700 | £700–2,000 |
| Basin and vanity unit (supply) | £150–400 | £400–1,000 | £1,000–4,000 |
| Heated towel rail (supply + fit) | £150–350 | £300–600 | £500–1,200 |
| Flooring (if not tiled — LVT or similar) | £200–400 | £400–800 | £800–2,500 |
| Plasterboard and waterproofing | £200–400 | £300–600 | £500–1,000 |
| Builder / project management | £300–600 | £500–1,000 | £1,000–3,000 |
Worked Example: 5m² Mid-Range Bathroom (2026)
A typical mid-range full refurbishment of a 5m² family bathroom in a three-bedroom semi-detached, replacing all sanitaryware in approximately the same positions, with ceramic wall tiles and luxury vinyl flooring.
| Item | Estimated cost |
|---|---|
| Strip-out and skip/disposal | £550 |
| Plumber (3 days @ £300/day) | £900 |
| Plumbing materials (pipe, waste, valves) | £350 |
| Electrician (1.5 days @ £320/day) | £480 |
| Electrical materials (fan, lighting, wiring) | £200 |
| Waterproofing and plasterboard | £450 |
| Tiler (4 days @ £260/day) | £1,040 |
| Wall tiles (8m² @ £45/m²) | £360 |
| Floor tiles (5m² @ £55/m²) | £275 |
| Tile adhesive, grout, edge trims | £180 |
| Bath (freestanding-style acrylic) | £650 |
| Shower enclosure and tray | £850 |
| WC with concealed cistern | £500 |
| Basin and vanity unit (600mm) | £550 |
| Heated towel rail (supply + fit) | £380 |
| Mirrors, accessories | £200 |
| Builder (1 day, coordination and making good) | £280 |
| Contingency (10%) | £820 |
| Total (ex-VAT) | £8,815 |
| VAT at 20% | £1,763 |
| Total (inc-VAT) | £10,578 |
This is a realistic all-in figure for a competent mid-range bathroom in London and the South East. Costs are 10–20% lower in most other UK regions.
Trade Day Rates in 2026
Day rates vary by region (London and South East are highest), experience, and whether the tradesperson is self-employed or from a firm with overhead.
| Trade | Typical day rate (UK, 2026) | London / South East |
|---|---|---|
| Plumber | £250–350/day | £320–420/day |
| Tiler | £200–300/day | £260–370/day |
| Electrician | £250–380/day | £300–430/day |
| Labourer / general builder | £150–220/day | £190–270/day |
Day rate work suits experienced tradespeople you have vetted and trust; fixed-price quotes give more certainty for larger projects but may build in a contingency premium. Always obtain three quotes for a bathroom project and ask for itemised breakdowns — this makes comparison meaningful and negotiation honest.
Wet Room vs Shower Tray
A wet room (fully tanked floor-level shower area, no tray or enclosure) costs more than a standard shower enclosure and tray. Proper tanking — applying a liquid waterproof membrane to all walls and the floor before tiling — adds £400–900 to the tiling cost and requires a minimum drying time between coats. The floor must also slope to the drain at a minimum 1:80 fall, which typically requires a screeded former or a dedicated wet room tray under the tile finish.
A shower tray installation is faster, cheaper, and more forgiving of minor waterproofing lapses, but limits the size and shape of the shower. A 900×900mm tray and enclosure can be installed in half a day by an experienced plumber; a wet room of the same floor area takes a tiler two to three days of tanking and tiling.
Building Regulations Requirements
Part P (Electrical safety) applies to all electrical work in a bathroom. Any new circuit, new consumer unit connection, or significant alteration to existing bathroom wiring must be carried out by a Part P registered electrician (NICEIC, NAPIT, or similar scheme member) who will self-certify their own work, or by an unregistered electrician whose work must be inspected and certified by Building Control.
Part G (Sanitation, hot water safety, water efficiency) requires a thermostatic mixing valve (TMV) on baths in dwellings where children under five or vulnerable adults are present — the valve limits hot water supply to the bath to a maximum of 48°C. New WCs must use a maximum 6-litre flush (dual-flush cisterns meeting WaterLabel standards are standard). Taps and showers must meet minimum flow rate requirements under the Water Regulations.
Part F (Ventilation) requires a minimum 15 litres per second extract rate for a bathroom with a bath or shower. A window alone does not satisfy this; a mechanical extract fan is required. Fans must be capable of operating via an overrun timer (typically 15 minutes after the light is switched off) to fully clear moisture.
VAT
Standard-rate 20% VAT applies to most bathroom fitting and supply work. A reduced rate of 5% VAT applies to some energy-saving materials — specifically qualifying insulation, draught-proofing materials, and renewable heat products — installed in eligible dwellings, but this does not reduce the rate on sanitaryware, tiling, or general plumbing. Some specialist bathroom companies offer supply-only pricing (zero-rated for certain residential supplies); confirm the VAT treatment with your contractor in writing before signing a contract.
What Pushes Cost Up
Moving the soil stack — the large 110mm soil pipe that carries waste from the WC — is among the most expensive single plumbing alterations in a bathroom project, adding £1,500–4,000 or more depending on its route through the building and whether it exits through an external wall or through the roof.
Structural changes — cutting a new opening for a skylight or window, removing a non-structural partition to enlarge the room — add both labour cost and Building Regs implications.
Underfloor heating (UFH) under tiles adds £50–100/m² for electric mat systems and requires the tiler to integrate the mat into the tile adhesive bed. Wet UFH systems in a bathroom refurbishment are less common due to the complexity of connecting to the heating circuit.
Premium tiles slow the tiler down significantly. Large-format tiles (600×1,200mm or above), natural stone, and intricate mosaic work can reduce output to 2–3m² per day, doubling tiling costs compared with standard 30×60cm ceramic.
Bespoke fitted furniture — full-height vanity units, drawer towers, and mirror cabinets from a bespoke joiner — adds £2,000–8,000 over standard freestanding or semi-fitted furniture.
