Bathroom Renovation Costs in London 2025: Full Breakdown

Bathroom renovation costs depend heavily on the existing condition of the bathroom, the quality of the materials chosen, and the complexity of the plumbing and electrical layout. Online calculators and showroom estimates typically cover only the supply of sanitaryware, tiles, and fittings — not the full labour, building, and services costs that make up the majority of a real project.

The main costs in a London bathroom renovation are: - Stripping out the existing bathroom and making good - Plumbing (moving or adjusting the soil pipe, basin waste, and supply connections) - Electrical work (shower circuit, extraction, lighting, heated towel rail) - Waterproofing and tanking (especially in wet rooms) - Tiling (floor and walls) - Plastering and painting - Supply and installation of sanitaryware (bath, shower, basin, WC, heated towel rail) - Any structural work (removing a wall, adjusting the door opening)

The tiles and sanitaryware that people spend most time choosing in a showroom typically account for only 25–40% of the total project cost. Labour, plumbing, and building work account for the rest.

**Standard bathroom renovation (family bathroom, no layout change, straightforward plumbing)** - Basic specification (budget sanitaryware, ceramic tiles): £6,000–£10,000 - Mid-range specification (mid-quality sanitaryware, large format tiles, walk-in shower): £10,000–£18,000 - High specification (designer sanitaryware, stone tiles, freestanding bath, bespoke glass screen): £18,000–£35,000+

**En-suite shower room (smaller, simpler plumbing)** - Basic specification: £4,500–£8,000 - Mid-range specification: £8,000–£14,000 - High specification: £14,000–£25,000+

**Wet room conversion** - Basic specification: £7,000–£12,000 - Mid-range specification: £12,000–£20,000 - High specification: £20,000–£40,000+

**Cloakroom (WC and basin only)** - Basic: £3,000–£5,000 - Mid-range: £5,000–£9,000 - High specification: £9,000–£18,000

These ranges reflect London contractor rates in 2025 and include supply of sanitaryware, tiles, and all associated labour, plumbing, and electrical work.

Breaking the cost down by trade element for a typical mid-range standard bathroom renovation (10–12m2, no layout change) in London:

- **Strip-out and disposal**: £500–£1,200 - **First-fix plumbing (adjustments, new connections, soil pipe if moved)**: £800–£2,500 - **First-fix electrical (shower circuit, underfloor heating, extraction, lighting)**: £600–£1,500 - **Waterproofing/tanking (wet areas)**: £400–£900 - **Plastering and preparation**: £500–£1,200 - **Tiling (floor and walls, per m2)**: £50–£120/m2 labour, plus tile cost (£20–£200/m2 supply) - **Sanitaryware supply**: £1,000–£8,000 (wide range depending on brand and specification) - **Sanitaryware installation**: £600–£1,500 - **Heated towel rail supply and installation**: £200–£800 - **Shower enclosure/glass screen**: £300–£2,500 supply; £200–£600 installation - **Extraction fan and MVHR connections**: £150–£400 - **Decoration**: £300–£700 - **Project management and contractor margin**: 15–25% of subcontract trades

For a mid-range bathroom with a double shower enclosure, freestanding bath, wall-hung basin, and large-format floor and wall tiles: total installed cost in London is typically £13,000–£18,000.

**Layout change**: Moving the soil stack, the bath, or the shower to a new position means new drainage pipework — often through floor joists or into the wall chase. A bathroom where everything stays in the same position costs significantly less than one where the client wants to completely rearrange the space.

**Wet room**: A walk-in wet room requires proper linear drainage, a tanked (waterproofed) floor and walls to height, a very carefully laid floor with adequate fall to the drain, and often underfloor heating to improve comfort and drying. Wet rooms are more expensive than standard shower enclosures per m2.

**Large format tiles**: Large format tiles (600x600mm and larger, or long-format 300x1200mm) require a better substrate (flatter floor/wall), more careful laying to avoid lippage, and greater skill from the tiler. Labour cost for large format tiles is typically 20–40% higher than for standard 300x300mm or 600x300mm tiles.

**High ceilings and intricate layouts**: Victorian bathrooms with higher ceilings, cornices, or complex wall layouts require more tiling labour.

**Underfloor heating**: Electric underfloor heating mats (£150–£350 material, £200–£500 installation) are commonly added to bathroom renovations. Water-fed UFH under tiles is less common in bathroom-only renovations due to pipework complexity.

**Freestanding bath**: A freestanding bath requires supply pipes to run to the bath position (often from the floor, which means more plumbing), a flexible shower hand-set, and careful attention to the surround floor area. Labour cost premium: £300–£600 over a standard panel bath.

Steps to build a realistic bathroom renovation budget:

1. **Decide your specification tier first**: Basic (function-led, quality fittings, practical tiles), mid-range (quality brands, some design intent), or high specification (designer brands, bespoke features, premium tiles). Your budget tier should be decided before selecting individual products.

2. **Get a detailed contractor quote — not just a showroom estimate**: A showroom estimate covers products only. Ask a reputable contractor for a full labour-and-materials quote before committing.

3. **Allow for contingency**: Old London bathrooms frequently reveal hidden problems on strip-out: rotten timbers, missing waterproofing under old tiles, leaking pipes, crumbling plaster, outdated wiring. Allow 10–15% contingency.

4. **Do not split the project between a bathroom designer and a separate contractor**: Miscommunication between design intent and contractor delivery is the most common source of bathroom renovation problems. Use a single design-and-build partner for accountability.

5. **Check what is included**: Ensure quotes include tiles, sanitaryware supply, all electrical work, Building Regulations notification (Part P electrical certification), and all waste disposal. Quotes that exclude any of these will cost more than they appear.