How to Price a Bath Replacement: Like-for-Like Swap, Walk-In Conversion and Tile Make-Good

Quick Answer: A like-for-like bath replacement (same position, standard 1700×700mm bath) prices £680–£1,400 in 2026 including bath, taps, basic tile make-good and 1 day's plumbing labour. A walk-in shower conversion (bath out, shower tray and screen in) prices £1,800–£3,800. The single biggest pricing trap is tile make-good — the new bath rim almost never lines up with the old tile cut, and the customer expects an invisible repair. Quote for tile work explicitly or carry the make-good cost as a hidden margin killer.

Summary

Bath replacement is the volume earner for any domestic bathroom plumber. It's a 1–2 day job, predictable scope when the existing tiling is preserved, and recurring demand as 1980s and 1990s baths reach end of life. The price per job is modest (£680–£1,400 typical) but the gross margin is healthy because labour content is dominant and material spread is wide — a £150 standard acrylic bath delivers the same finished job as a £450 designer steel-enamel bath, and the customer chooses the spec.

The market splits cleanly into three product types. Like-for-like replacement (same bath shape, same plumbing position, no tile change) at £680–£1,400 is the bread-and-butter swap, especially common in landlord properties and end-of-life replacements. Walk-in shower conversion (bath out, tray and screen in) at £1,800–£3,800 is the volume add-on, driven by the ageing population trend and typically initiated by the customer's mobility concerns. Walk-in bath / accessible bath (Premier Care, Mobility Plus, etc.) at £2,800–£8,500 is the high-margin specialist install with bespoke pricing.

The Approved Document G water efficiency requirement (140 litres/person/day calculated) means new builds must specify water-efficient sanitaryware — but for replacements in existing dwellings, the customer can choose any spec. Standard bath capacity is 180–200 litres; deep-soak baths run to 240–280 litres. The Building Regulations don't restrict bath capacity in retrofit, but water meter customers should be aware of the running cost difference.

Key Facts

• Standard bath size — 1700×700mm or 1800×800mm
• Compact bath size — 1500×700mm (small bathrooms)
• Capacity standard bath — 180–200 litres
• Capacity deep-soak — 240–280 litres
• Acrylic bath material cost — £85–£280 (£250–£450 for designer brand)
• Steel enamel bath material cost — £180–£480
• Cast iron bath (period) — £450–£1,800
• Bath taps (mixer) — £55–£280
• Bath waste and overflow — £18–£42
• Bath panel (front + end) — £40–£140
• Plumbing labour to swap bath — £180–£420 for the day
• Tile make-good (per bath edge) — £80–£280 in matching/contrasting tile
• Walk-in shower tray (1200×800) — £180–£480 (low-profile 30–40mm)
• Shower screen (sliding, 1200mm) — £180–£480
• Wet room install (full) — £2,500–£5,500 for typical small bathroom
• Walk-in bath specialist — £2,800–£8,500
• Building Regulations Part G — water efficiency for new builds and major refurbishment
• BS EN 14516:2015 — Baths for domestic purposes
• BS EN 14688:2015 — Sanitary appliances — wash basins
• WRAS approval — Water Regulations Advisory Scheme certification for fittings

Quick Reference Table

Detailed Guidance

Like-for-like bath swap — the volume product

The standard bath swap is a 1-day job for a competent plumber:

1. Isolate water and drain bath (15 min) — turn off mains, drain bath of water, drain trap
2. Disconnect taps and waste (20 min) — remove taps, lift waste, disconnect trap
3. Remove old bath (20–40 min) — unscrew or cut bath panel, lift bath out (often via end of bath, requires room manoeuvre)
4. Inspect and prep substrate (15–30 min) — check floor for rot, check for blocked stack, check for scaffolding to next-door wall
5. Position new bath, level, secure cradle (45–90 min) — wedge bath supports, level in two directions, foam-pack any gaps
6. Reconnect plumbing (60–120 min) — fit new taps with washers, fit waste, connect trap, refit bath panel, plug pipes, test for leaks
7. Tile make-good (60–180 min) — cut and refit tiles at bath rim, silicon seal, clean down

For a standard acrylic bath in good tile condition, this is 6–8 hours. Add £180–£380 plumber's labour, £85–£280 bath, £55–£280 taps, £40–£140 bath panel, £40–£100 waste/connectors, £20–£50 silicon and consumables — total £420–£1,100 cost. Sell at £680–£1,400 with healthy margin.

Tile make-good — the silent budget killer

The new bath rim almost never lines up with the old tile cut. Three scenarios:

Best case — new bath identical to old, rim height matches. 30 minutes of silicon work, no tile cutting, customer happy.

Middle case — new bath rim 5–15mm different from old. Need to cut a strip of tile to fill, silicone the joint. 1–3 hours, depends on tile availability (matching vs contrasting). £80–£180 add-on.

Worst case — new bath shape entirely different (e.g. P-shape or curved end), or rim height >20mm different. Need to strip tiles down at least one course, retile, grout and silicon. 4–8 hours, may need to procure matching or near-matching tile. £200–£480 add-on.

Always ask the customer at quote stage:

• Are the existing tiles a match the customer wants to preserve?
• Do you have any spare tiles from the original install?
• Is the new bath the same dimensions as the old?

If matching tiles aren't available, propose either a contrasting border tile (often a feature, not a defect), a paint-finish trim, or a full retile of that wall. Build the cost into the quote — don't absorb it.

Walk-in shower conversion — the upsell

The most common upgrade. Customer has a 1700×700 bath, doesn't use it for bathing, wants a walk-in shower for ease of access.

Scope:

1. Remove bath (as above)
2. Remove bath panel and waste runs
3. Modify trap and waste — most baths drain to a 40mm waste; shower trays often need an upgraded 50mm trap. Re-pipe to existing soil stack.
4. Floor prep — bath was sat on a frame, leaving a void. Fill with insulation board or screed to bring up to required level for tray.
5. Fit shower tray (typically low-profile 30–40mm rim height for ease of access)
6. Fit shower screen — sliding panel, hinged, walk-in glass or full enclosure
7. Fit shower mixer or thermostatic shower (existing mixer may be reusable; thermostatic upgrade is £180–£420 for the unit)
8. Tile make-good — bath surround tile typically extends below the new tray level. Tile around the new tray and silicon seal.

Total time: 2–3 days for a basic conversion, 3–5 days for a full retile. Total fee: £1,800–£3,800 typical.

Premium upsell options:

• Larger walk-in (1400×900 instead of 1200×800) — adds £150–£280
• Frameless shower screen — adds £180–£480 over framed
• Thermostatic shower mixer with riser kit — adds £200–£480
• Heated towel rail relocation — adds £180–£280
• Full retile of shower wall in feature tile — adds £400–£900

Wet room conversion — the high-spec product

For customers wanting a fully open-plan wet room (no tray, gradient floor, full waterproofing):

1. Floor preparation — joist strengthening if timber floor, gradient-form to drain
2. Tanking — full BS 8000-4 tanking system to the wet zone, typically 1.8m above floor and 600mm beyond shower zone
3. Drain installation — linear drain or central drain, falls 1:50 to 1:80
4. Tile — non-slip floor tile (R10 or R11 for wet zone), wall tile to ceiling height
5. Glass screen — fixed or hinged, no cubicle door
6. Mixer/thermostatic shower — wall-mounted

Scope is much greater than walk-in shower conversion. Total fee: £2,500–£5,500 for a small bathroom (under 6m²), £4,500–£8,500 for a larger bathroom.

The waterproofing is the make-or-break detail. Tanking failure leads to ceiling damage in the room below within 6–18 months. Always use a proprietary tanking system (Schluter Kerdi, Mapei Mapelastic, BAL Waterproof) with manufacturer-specified primers and reinforcement at corners. Cheap or DIY tanking is the most common failure mode in wet-room work.

Walk-in bath — the specialist product

Walk-in baths (Premier Care, Mobility Plus, Bathing Solutions) are sold direct to the consumer through specialist sales channels and installed by the manufacturer's network. Pricing is bespoke — typically £2,800–£8,500 fitted depending on bath spec (powered seat, hydrotherapy jets, etc.).

For a generalist bathroom plumber, this market is harder to enter — the customer is sold by the manufacturer's salesperson, not via search. However, some customers procure the bath separately and ask a local plumber to fit. Fitting fees range £450–£1,200 for the install only (bath supplied by customer). Be cautious — the warranty on these baths often requires manufacturer-trained installation.

Bath taps and waste — the small earners

Tap-only or waste-only swaps are common standalone jobs:

• Bath mixer tap replacement: £180–£380 fitted (includes labour, washer kit, basic mixer at £55–£140)
• Pillar taps replacement: £140–£280 fitted (pair of pillar taps £30–£80)
• Bath waste replacement (drip tap won't seal): £120–£220 (waste kit £18–£42, 1.5 hours labour)
• Overflow leak repair: £80–£140 (trap and overflow re-seat, 1 hour)

These small jobs are minimum-call-out priced. Be clear about minimum fees — a £85 minimum gets the plumber out of bed.

Building Regulations Part G — water efficiency

Approved Document G (Sanitation, Hot Water Safety and Water Efficiency) sets a 125 litres/person/day water consumption for new dwellings (110 litres optional for higher water-stressed areas). For replacements in existing dwellings, the requirement doesn't directly apply — but local water companies (Severn Trent, Thames Water, Anglian) often offer rebates or fittings for water-efficient choices.

Bath capacity and tap flow rates contribute to the calculation. For new build, the architect or M&E designer specifies which bath model meets the calculation. For replacement, the customer chooses freely.

WRAS approval and water bylaws

All fittings on the public mains supply must be WRAS-approved (Water Regulations Advisory Scheme) under the Water Supply (Water Fittings) Regulations 1999. This includes taps, valves, and any plumbing component in contact with potable water. Most major brand taps (Bristan, Mira, Grohe, Hansgrohe, Methven) are WRAS-approved as standard. Cheap eBay/Amazon imports often aren't — installing a non-WRAS fitting is technically a regulatory breach and risks insurance claim refusal in the event of a flood.

Frequently Asked Questions

How much to replace a bath in the UK 2026?

£680–£1,400 for a like-for-like bath swap (acrylic bath, standard taps, basic tile make-good) typically completed in 1 day. Steel enamel or designer baths cost more (£850–£2,800), and changing the bath shape or layout adds tile make-good cost. A walk-in shower conversion with the bath removed prices £1,800–£3,800 typically.

Should I replace my bath with a walk-in shower?

Depends on resale value vs personal use. For a property that will be sold within 5–10 years, retaining at least one bath is preferred by buyers (especially families with young children). For a property the customer plans to stay in long-term, especially if mobility is a concern, walk-in showers are an obvious upgrade. The cost is similar to a bath replacement plus tile work, so financially the choice is a wash — it's about what the customer needs.

Can I install a walk-in bath myself?

Walk-in baths from major brands (Premier Care, Mobility Plus) typically come with manufacturer-trained installation as standard, and DIY install often invalidates the warranty. The plumbing connections are similar to a standard bath, but the structural support, door seal mechanism, and electrical (if powered) require careful install. For a generalist plumber, fitting a walk-in bath supplied by the customer is feasible at £450–£1,200 install fee — but verify warranty terms first.

How long does it take to replace a bath?

A like-for-like swap is 1 day for a competent plumber (6–8 hours of work). A walk-in shower conversion is 2–3 days. A wet room install is 4–6 days. Tile make-good adds time if matching tiles aren't available — a worst-case full retile of one wall is 4–8 hours of additional work.

Do I need Building Regulations approval to replace a bath?

For a like-for-like replacement in an existing bathroom: no Building Regulations approval needed, no notice to Building Control. The work is outside the regulated scope. For a new bathroom (new room conversion), or a bathroom relocation that involves new soil pipe runs or significant electrical re-routing, Building Regulations approval is required. Always check Approved Document G if the customer is doing more than a like-for-like swap.

Regulations & Standards

• Building Regulations Approved Document G — Sanitation, hot water safety and water efficiency

• Building Regulations Approved Document P — Electrical safety in dwellings (any electric heating, fan, or shower wiring)

• The Water Supply (Water Fittings) Regulations 1999 — WRAS approval requirement

• BS 6700:2006+A1:2009 — Specification for design, installation, testing and maintenance of services supplying water for domestic use within buildings

• BS EN 14516:2015 — Baths for domestic purposes

• BS 8000-4:2020 — Workmanship on building sites: Code of practice for waterproofing

• The Construction Products Regulations 2013 — affects bath material certification

• WRAS — Water Regulations Advisory Scheme — fittings approval database

• GOV.UK — Approved Document G — water efficiency

• Bathroom Manufacturers Association — trade body resources

• The CIPHE — Chartered Institute of Plumbing and Heating Engineering — competent person scheme

• BSI — BS EN 14516 — bath manufacturing standard

• complete bathroom installation including bath replacement — for the full-refit context

• toilet replacement as the parallel sanitaryware swap — for adjacent jobs

• en-suite installation including bath or shower spec — for new bathroom add

• accessible bathroom design including walk-in baths and showers — for the mobility design picture

• technical installation of baths including support, level and tap connection — for the practical install detail