How to Price a Full Bathroom Installation: Fit-Out Labour, Materials and Margin

Quick Answer: A typical UK full bathroom installation prices between £6,500 and £18,500 in 2026 for a standard 2.5 × 2.0m family bathroom — that's £4,500–£8,500 fit-only labour plus £2,000–£10,000 of materials, fittings and tiles. Strip-out, first-fix plumbing and electrics, plastering and second-fix typically take 8–14 working days for a 2-trade team. Tile selection alone can swing the materials line by £1,500–£4,500. Notifiable Part P electrical work and Part G unvented work need competent-person sign-off and add £150–£400 to the labour line each.

Summary

The headline £/m² rule of thumb that gets thrown around for bathrooms — £1,500–£3,000 per m² — is a useful sanity check but a poor pricing tool. A 5 m² bathroom doesn't price at half a 10 m² bathroom because the fittings count is the same: one bath, one basin, one WC, one shower screen, plus the same number of valves, drains, and wall-fixings. The labour days are tightly bounded by trade sequencing, not by floor area.

The right pricing model for full bathrooms is a banded labour line plus an itemised materials line. Labour is banded by complexity (direct swap, refit with layout change, or refit with structural/wall change). Materials are itemised because the homeowner wants to choose the bath, taps and tiles themselves and you cannot estimate that for them — they have a £200 to £1,200 spread on the bath alone.

The single biggest pricing trap is wall preparation. Removing old tiles often pulls plaster off the wall behind. Quoting "tile direct to existing surface" without inspecting what's behind the existing tiles is how a £6,500 quote becomes a £9,000 invoice when the homeowner gets billed for hardwall plastering they didn't know they needed. Always quote a strip-out and inspect line, then a fixed-price re-quote once the walls are seen.

Key Facts

Quick Reference Table

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Job type Bathroom size Labour days Total install (incl. materials)
Direct swap (bath, basin, WC, no layout change, retile floor only) 4–5 m² 5–7 £4,000–£6,500
Standard refit (4-wall retile, layout unchanged) 4–6 m² 8–11 £6,500–£10,500
Refit with layout change (bath swap to shower, WC re-soiled) 5–7 m² 10–14 £8,500–£14,500
High-spec refit (large-format tile, designer fittings) 5–7 m² 12–16 £12,500–£20,000
Premium fit (marble, bespoke vanity, underfloor heating) 6–9 m² 16–24 £18,000–£32,000
Wet room conversion 4–6 m² 12–18 £8,500–£18,000 — see wet room pricing
En-suite (smaller, fewer fittings) 2.5–4 m² 6–10 £5,500–£12,000 — see en-suite pricing

Detailed Guidance

Labour banding and trade sequence

The labour estimate should follow the actual trade sequence on site. A two-person team (lead plumber + tiler/multi-trade) is the most common configuration:

Day 1–2  STRIP-OUT          → bath, WC, basin, tiles, old waste
                              skip on drive (mini 4-yd or midi 8-yd)
                              ─ inspect walls, floor, soil pipe ─
Day 3–4  FIRST-FIX PLUMB    → reroute pipes, new waste runs,
                              shower valve in plasterboard box,
                              cable run for fan/shower pump
Day 4–5  FIRST-FIX ELEC     → fan circuit, lighting, shaver socket
                              all to BS 7671 zone rules
                              Part P notification raised
Day 5–6  PLASTER & DRY      → patch, hardwall, skim or board over
                              drying time 3–5 days minimum
Day 7    TANKING            → shower enclosure to floor + 1.8m up walls
Day 8–11 TILING             → walls then floor; 24-hr cure between
                              adhesive and grout
Day 12   FIT-OUT            → bath, WC, basin, taps, shower screen
Day 13   COMMISSION & SNAG  → leak-test, certificates, final clean
                              Part G3 notice if cylinder installed
                              Part P certificate to homeowner

Each delay anywhere in the chain pushes everything downstream by the same amount. Quote labour at the upper end of the band when the homeowner is choosing tiles and fittings late in the day — late material delivery is the biggest single cause of overrun.

Materials — the homeowner-driven line

Materials prices vary by 5–8× between budget and premium specification. The honest approach is to give the homeowner banded material allowances they can choose from and re-quote if they go above the allowance:

Item Budget (B&Q, Plumbworld) Mid-range (Victoria Plum, Bathstore) Premium (independent showrooms)
Bath (1700mm) £150–£300 £350–£600 £800–£2,500
Basin and pedestal £80–£200 £200–£500 £600–£1,800
WC and cistern £150–£350 £350–£700 £700–£1,800
Shower valve and head £150–£350 £350–£800 £800–£2,500
Shower enclosure 800–900mm £200–£450 £450–£900 £900–£2,500
Bath taps £60–£150 £150–£400 £400–£1,200
Floor tiles (per m²) £18–£40 £40–£80 £80–£250
Wall tiles (per m²) £15–£35 £35–£70 £70–£200
Adhesive, grout, tanking, primer £200–£350 £250–£400 £350–£550
Sundries (silicone, fixings, waste pipe, joint compound) £150–£250 £200–£300 £250–£400

A standard 2.5 × 2.0m bathroom with 4-wall tile and floor tile takes 18–22 m² of wall tile and 5 m² of floor tile.

Bathroom-zone electrical compliance

BS 7671 splits bathrooms into zones with strict IP ratings. Costing this in correctly avoids back-pedalling on the spec:

A typical bathroom needs: an extractor fan (Zone 1, IPX4), 2–3 downlights (Zone 1 if directly over shower, IPX4), a shaver socket (Outside zones), and possibly a heated towel rail with thermostat (Zone 2 fused spur). Allow £350–£600 in fittings plus £450–£800 in labour for a competent person to design and install.

Notifications and certificates

Three notification types apply:

Common cost overruns to flag in the quote

Budget allowances for these line items because they catch homeowners and installers out:

A line called "Provisional sum for hidden surveying issues — £400" sets the right expectation.

Frequently Asked Questions

How long should a full bathroom take?

Most family bathrooms are 8–14 working days for a two-trade team. Add 2–4 days for any layout change and 3–5 days mandatory plaster drying time. The homeowner should plan to be without the bathroom for 2.5–3 weeks calendar time once the strip-out starts.

Do I need to use VAT-registered tradespeople for the BUS or any grant?

Bathroom installs aren't grant-eligible in 2026. The homeowner pays VAT on labour and materials at 20% if the supplier is VAT-registered. Reduced 5% VAT applies in some narrow conditions (long-empty property, residential conversion, accessibility adaptation for a disabled occupant) — verify with HMRC VAT Notice 708.

Can I split the job and use my own tilers?

Yes, but quote the strip-out and first-fix as a fixed price and the tiling as a separate engagement. The risk transfer at the tiling stage matters: if your plasterer leaves a poor surface and the tiler bonds badly, who's liable? Make the handover formal — the tiler signs off the wall surface as fit for purpose before starting.

Why is my quote so much higher than online "bathroom pod" prices?

Bathroom pod or container quotes (typically £4,000–£6,000 supply-only) are a stripped-down kit and assume you're a self-installer or the room is already perfect. They don't include strip-out, plastering, electrical alteration, plumbing reroute, or any unexpected wall repair — which together account for £4,000–£10,000 of a real-world install.

Does an accessible/disabled bathroom adaptation cost more?

A typical level-access wet room with grab rails, raised toilet, and accessible vanity adds £2,500–£6,000 over a standard refit. If the homeowner qualifies for a Disabled Facilities Grant (means-tested, up to £30,000 in England), the local authority pays direct or via a registered installer. The grant is administered by the council and approved before work starts.

Regulations & Standards