Downstairs Toilet Installation Cost UK 2026

Installing a new downstairs WC (cloakroom toilet) in 2026 costs £1,500–£4,000 — the most expensive toilet job because of plumbing, electrics, ventilation and partitioning.

Quick answer

Typical UK price range: £1,500–£4,500. Typical time: 5–10 days.

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Toilet calculator

Adjust the inputs to get an instant 2026 UK price estimate.

Toilet type Like-for-like replacement Wall-hung w/ concealed cistern Macerator (Saniflo) New downstairs WC

Region London South East South West Midlands North of England Scotland Wales Northern Ireland

Specification level Basic / standard Mid-range Premium / high-end

Extras

Premium pan + soft-close seat £150–£500 Splashback / tiling £200–£800 New cloakroom basin £200–£800 Extractor fan £150–£400

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Estimate only. Prices reflect 2026 UK market data — get quotes from local tradespeople for accurate pricing.

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Budget Under £5,000 £5,000 – £15,000 £15,000 – £30,000 £30,000 – £60,000 £60,000+ Not sure

Timeline As soon as possible 1 – 3 months 3 – 6 months 6+ months Just researching

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Key points

• £1,500–£4,000 typical
• Often built under stairs
• Plumbing + electrics + extractor required
• Adds 2–4 % to property value

Cost breakdown

Item	Low	High
Toilet + basin	£300	£900
Plumbing (incl. soil)	£600	£1,500
Electrics + extractor	£300	£700
Stud wall + tiling	£300	£900

Cost by UK region

Region	Typical cost
London	£4,050
South East	£3,750
South West	£3,300
Midlands	£3,000
North England	£2,700
Scotland	£2,850
Wales	£2,700

How to save money

• Locate near existing soil stack to avoid macerator
• Always specify a quiet extractor fan
• Wall-hung pan + basin saves visual space under stairs

How to find a trusted tradesperson

Get at least 3 quotes from vetted UK trade networks:

• Checkatrade
• MyBuilder
• Bark

FAQs

Do I need planning permission for a downstairs toilet?

No — interior remodelling is permitted development. Building regs sign-off needed for the plumbing/electrics.

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Disclaimer: Prices are guide ranges based on 2026 UK market data. Get quotes from local tradespeople for accurate pricing.