Bathroom renovation is consistently one of the top two projects UK homeowners undertake — and one where costs are routinely underestimated. A new suite looks straightforward until you lift the floor and find a corroded waste pipe, or discover the tiles conceal a damp problem that needs treating before tiling can begin. This guide gives you accurate 2026 cost ranges by bathroom size and specification, breaks down what drives the price and lists the extras most likely to catch you out.
Cost by Size and Specification
The most useful way to frame bathroom renovation costs is by the combination of room size and specification level.
| Room Size | Basic Spec | Mid-Range Spec | Premium/Luxury Spec |
|---|---|---|---|
| Small (under 4 m²) | £3,000–£5,500 | £6,000–£9,000 | £10,000–£16,000 |
| Standard (4–6 m²) | £4,000–£7,000 | £7,500–£12,000 | £13,000–£20,000 |
| Large / en-suite conversion (6–10 m²) | £6,000–£10,000 | £11,000–£18,000 | £18,000–£30,000 |
| Wet room (any size) | Add £2,000–£4,000 to above tiers | — | — |
Basic spec covers: close-coupled WC, bath with mixer tap, pedestal basin, electric shower over bath, ceramic floor and wall tiles (standard 300 × 300 mm or 250 × 400 mm), vinyl or tile floor.
Mid-range spec covers: back-to-wall or wall-hung WC with concealed cistern, freestanding or P-shaped bath with freestanding or wall-mounted tap, semi-recessed basin with vanity unit, thermostatic shower valve, large-format porcelain tiles (600 × 300 mm or 600 × 600 mm), heated towel rail, recessed LED lighting.
Premium/luxury spec covers: wall-hung sanitaryware, bespoke vanity joinery, stone or large-format stone-effect tiles (600 × 1200 mm or larger), walk-in shower enclosure with fixed head and body jets, freestanding bath, underfloor heating, feature lighting.
What Drives the Cost
Labour Is the Largest Line Item
For most bathroom renovations, labour — plumber, tiler, electrician, plasterer, sometimes a carpenter — accounts for 50–60% of the total bill. Day rates in 2026:
- Plumber: £280–£450/day (London and South East); £200–£320 elsewhere
- Tiler: £200–£350/day
- Electrician: £280–£420/day
- General labourer/first fixer: £180–£280/day
A standard 5 m² bathroom renovation takes roughly 5–8 days of plumbing, 3–4 days of tiling, 1–2 days of electrics. Many bathroom specialists combine the plumbing and labour into a single bathroom-fit day rate: £350–£500/day for a skilled bathroom fitter who brings a mate.
Sanitaryware: Suite Cost Ranges
| Item | Budget | Mid-Range | Premium |
|---|---|---|---|
| Close-coupled WC | £80–£200 | £250–£500 | £600–£1,500 |
| Wall-hung WC + frame | £350–£600 | £700–£1,200 | £1,500–£3,500 |
| Standard bath (1,700 × 700 mm) | £150–£350 | £400–£800 | £900–£3,000 |
| Freestanding bath | £500–£900 | £1,000–£2,500 | £3,000–£8,000 |
| Pedestal basin | £60–£150 | £180–£350 | £400–£900 |
| Vanity unit + basin | £200–£450 | £500–£1,000 | £1,200–£4,000 |
| Thermostatic shower valve | £180–£350 | £400–£700 | £800–£2,500 |
| Fixed shower head (200 mm) | £80–£150 | £200–£400 | £500–£1,500 |
A basic three-piece suite (WC + bath + basin) can be bought for £350–£800. A full mid-range package with shower, vanity and heated towel rail typically costs £2,500–£5,000 in materials.
Tiling
Tiling is where specification escalates most rapidly. Tile prices (supply only) per m²:
| Tile Type | Supply Cost (per m²) |
|---|---|
| Standard ceramic (300 × 300 mm) | £15–£35 |
| Large-format porcelain (600 × 300 mm) | £35–£80 |
| Large-format porcelain (600 × 600 mm+) | £50–£150 |
| Natural stone (limestone, marble) | £60–£200 |
| Handmade / metro brick | £30–£90 |
| Mosaic / feature tile | £80–£300 |
Tiling labour runs £35–£60/m² for standard tiles; large-format and stone tiles cost £55–£90/m² to lay (more cuts, more waste, heavier handling). A standard 5 m² bathroom has approximately 18–22 m² of wall and floor tile surface.
Waterproofing and Tanking
Any shower area, and any wall where tiles are applied over plasterboard, must be waterproofed. In a wet room or walk-in shower, the entire floor must be tanked (waterproofed membrane applied to the substrate before tiling). Tanking adds £300–£700 to a standard shower enclosure; wet room tanking for a full floor costs £600–£1,500 depending on area and the system used.
BS 5385 (wall and floor tiling) and the requirements of tile adhesive manufacturers specify the substrate preparation and waterproofing standards. Many insurance claims for bathroom water damage are declined because tanking was absent or incorrectly applied — this is a step to supervise carefully.
Common Extras That Inflate Budgets
Subfloor and Structure
Lifting old floor tiles frequently reveals:
- Rotten floorboards where a slow shower leak has gone undetected: replacement at £60–£150/m².
- Corroded or leaking waste pipes requiring replacement: £300–£900 depending on access.
- Floor levelling: older properties often have uneven timber floors that need a self-levelling compound before tiling — £150–£350 for a 5 m² room.
Electrical Work
Part P of the Building Regulations specifies that any new electrical work in a bathroom (Zones 0, 1, 2 as defined in BS 7671) must be designed and installed by a competent person and either self-certified by a registered electrician or inspected by Building Control. In practice this means:
- Installing a new shaver socket or recessed ceiling light: £180–£350 if your electrician is NICEIC/NAPIT registered and can self-certify.
- Underfloor heating (electric mat): £600–£1,400 supply and fit for a 5 m² floor.
- Extractor fan upgrade or new installation: £180–£350. Building Regulations Part F requires mechanical extract ventilation at minimum 15 l/s in bathrooms — an extract fan must be provided if there is no openable window.
Heating
Most bathrooms require a heated towel rail or radiator — standard electric or plumbed rails run £150–£500 for supply; plumbed connections add £200–£400.
Underfloor heating adds considerable comfort to a tiled bathroom floor. Electric mat systems (the most common for bathroom retrofits) cost £35–£70/m² for the mat and thermostat plus installation.
Wet Rooms
A wet room (no shower tray or enclosure — the entire floor slopes to a drain) costs more than a standard shower enclosure due to the additional tanking, linear drain, and screeded floor required. Key differences:
- Floor must be screeded with a 1:60 minimum fall to the drain — screeding adds £40–£80/m².
- Linear drain or centre drain to BS EN 1253 — supply cost £200–£600.
- Full floor and wall tanking — add £800–£1,800.
- Glass partition (fixed glass screen rather than full enclosure): £600–£1,800 supply and fit.
Total additional cost over a standard shower installation: £2,000–£4,500. A wet room in a 4 m² bathroom at mid-range specification typically costs £10,000–£15,000 all-in.
How Long Does a Bathroom Renovation Take?
Most bathroom renovations are completed in 1–2 weeks of on-site work:
| Stage | Duration |
|---|---|
| Strip-out | 0.5–1 day |
| First-fix plumbing and electrics | 1–2 days |
| Plasterboard, waterproofing | 1–2 days |
| Tiling (walls and floor) | 3–5 days |
| Second-fix plumbing (fit suite) | 1–2 days |
| Second-fix electrics | 0.5–1 day |
| Grouting, sealant, snag | 0.5–1 day |
| Total | 7–14 working days |
The bathroom is typically unusable for the entire period. If you have only one bathroom in the house, this is a serious practical constraint — worth discussing with your contractor whether phasing the work (maintaining a functioning WC for as long as possible) is feasible.
Getting Quotes
Request itemised quotes that separate labour and materials; this lets you buy your own sanitaryware (often cheaper than contractor supply) and gives you a clear labour-only figure to compare. Most reputable bathroom contractors offer a 1–3 year labour guarantee and can advise on manufacturer warranties for the suite.
For any bathroom renovation involving electrics or structural changes, confirm that Building Regulations compliance is included in the scope — certificates that are missing at the time of sale can delay a house transaction significantly.
