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01 · Ask
Diagnose before you call
Tell the AI what's leaking, dripping or rumbling. It tells you whether you need a plumber, a gas engineer, or a drain specialist — and how urgent it is.
Fit plumbing valves.
Isolation, TRV, drain-off or service valves — leak-tested, push-fit or soldered, by a local plumber.
✓ Updated May 2026✓ Free quotes✓ Vetted pros
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02 · Read the brief
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Gas Safe vs WaterSafe, boiler warranty conditions, unvented cylinder rules. The plumber brief covers the regs most homeowners learn the hard way.
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03 · Compare
Compare 3 plumber quotes
Up to Three local plumbers come back with itemised quotes — parts, labour and call-out fees — so you can compare like-for-like.
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Top tips
Hiring a plumber, without the regret.
Four moves that separate a smooth job from a nightmare.
Always ask for the Gas Safe ID.
If gas work is part of the job, the engineer must show their Gas Safe registration card. Verify the number at gassaferegister.co.uk before they touch anything.
Get three written quotes.
Plumbing prices vary wildly by job and area. Three quotes shows you the market — anything more than 20% out from the others is a flag.
Insist on parts receipts.
For boiler parts, valves and cylinders, ask for manufacturer receipts. Genuine parts come with warranty; refurbished kit often doesn't.
Hold final payment until tested.
Pay in stages, not upfront. Hold the last 10–20% until you've run hot taps, flushed the system and seen the certificate.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Hourly call-out rateHigher in London
£40–£90/hr
Tap or mixer replacement
£80–£250
Radiator installationInc. valves + balancing
£200–£600
New combi boiler installed
£1.8k–£4.5k
Full bathroom plumbingExcl. tiles + suite
£1.5k–£6k
Emergency leak call-outOut-of-hours
£120–£350
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
Infographic · VideoThe Plumber briefing.
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Plumber quick-view
Video guide
Plumber explained
Adding isolation valves to fixtures is one of the highest-value small plumbing jobs. They let you swap a tap, toilet or radiator without draining the whole system — and any plumber will fit them in 20–40 minutes.
Common valves and their use
- Isolation (15/22mm) — under taps, behind WCs, on cold feed to combi
- Gate valve — older systems, full-bore shutoff
- Drain-off valve — on radiator low points, for system flush
- Service valve — high-flow shutoff, often before mixer showers
- TRV (thermostatic radiator valve) — Part L compliant zone control on each radiator
Typical UK costs (2026)
| Item | Cost |
|---|---|
| Single isolation valve fit | £35–£75 |
| TRV swap (per radiator) | £55–£120 |
| Stopcock replacement | £75–£180 |
| Full set of isolation valves (8+) | £280–£550 |
Tips
Push-fit (Speedfit, JG) is faster but slightly more expensive; soldered is bombproof but only works on copper. Compression is universal and fixable, but ugly.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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