2026 Pricing Guide
Plumbing & Heating Costs UK 2026
New boilers, central heating systems and general plumbing — see real UK prices and get an instant estimate.
Plumbing and heating work ranges from a £300 repair to an £8,000 full central heating system. In 2026, a new combi boiler fitted costs £2,000–£3,500, while a complete central heating system with boiler, radiators and controls costs £4,500–£8,000. Always use a Gas Safe registered engineer for any gas work, and factor in the boiler brand, property size and whether existing pipework can be reused.
Plumbing & Heating Prices
How Much Does Each Plumbing & Heating Option Cost?
Prices below are indicative 2026 UK market rates and include labour and materials. Use our calculator for a personalised estimate.
New Combi Boiler (fitted)
£2,000 – £3,500
Supply and fit a mid-range combi (Worcester Bosch, Vaillant). Includes flush and commissioning.
Boiler + Radiator Upgrade
£3,500 – £5,500
New combi plus 6–10 radiators replaced, TRVs and system flush.
Full Central Heating System
£4,500 – £8,000
New boiler, all radiators, pipework, controls and smart thermostat. Best for full refurbs.
System / Regular Boiler
£2,300 – £4,200
For homes with a cylinder and hot water tank. Costs slightly more than combi.
Power Flush
£350 – £600
Cleans sludge from existing system. Recommended when fitting a new boiler to old radiators.
General Plumbing (repairs)
£300 – £1,500
Leak repairs, tap/sink replacement, toilet fixes, small pipework alterations.
* All prices are estimates. A site survey is required for an accurate quote. Use our calculator for a personalised estimate.
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The Plumbing & Heating Process Step by Step
Survey & Quote
Gas Safe engineer assesses your home, hot water demand and existing system, recommends a boiler and provides a fixed quote.
Choose Boiler & Controls
Select brand, model, warranty length, smart thermostat and any new radiators.
Installation Day
Drain system, remove old boiler, fit new boiler and flue, connect pipework, install controls. Power flush if needed.
Commission & Register
Fire up boiler, balance radiators, check pressure and emissions. Engineer registers the install with the manufacturer to activate warranty.
Handover & Certificates
You receive the Gas Safe certificate, warranty documents and a demo of the controls.
Common Mistakes
4 Mistakes to Avoid
Using an Unregistered Engineer
Any gas work must be done by a Gas Safe registered engineer. Ask to see their ID card. Unregistered work is illegal, invalidates warranties and is dangerous.
Oversizing the Boiler
A bigger boiler isn't better. An oversized combi short-cycles, wastes gas and wears out faster. Size it to your radiators and hot water demand, not headroom.
Skipping the Power Flush
Fitting a new boiler to a dirty system clogs the heat exchanger within months and voids the warranty. Always flush if the system is old.
Ignoring Smart Controls
A smart thermostat (Nest, Hive, Tado) saves 10–15% on heating bills and lets you zone your system. Add it for £150–£300 — it pays back within 2–3 years.
FAQs
Plumbing & Heating Cost FAQs
How much does a new boiler cost in the UK in 2026?
A new combi boiler fitted costs £2,000–£3,500 in 2026. A system or regular boiler costs £2,300–£4,200. Adding a full set of new radiators brings the total to £3,500–£5,500. A complete central heating system costs £4,500–£8,000.
How long does a boiler installation take?
A like-for-like combi swap takes 1 day. Converting from a system/regular boiler to a combi (removing tanks, repositioning pipework) takes 2–3 days. A full central heating system with all new radiators takes 3–5 days.
Which boiler brand is most reliable?
Worcester Bosch, Vaillant and Viessmann consistently top reliability surveys. Ideal and Baxi are good mid-range options. Always choose a brand with a 7–10 year warranty and use a Gas Safe registered installer.
Do I need a power flush with a new boiler?
If your existing radiators are old or the system water is dirty, a power flush (£350–£600) protects the new boiler's heat exchanger and validates the warranty. Many installers include it; some charge extra.
How much do new radiators cost?
A single radiator supplied and fitted costs £200–£450 depending on size and style. Designer or column radiators cost more. Replacing 8 radiators costs £1,600–£3,600 fitted including TRVs.
Is a combi boiler better than a system boiler?
Combi boilers are ideal for 1–2 bathroom homes — they heat hot water on demand with no tank, saving space. System boilers suit larger homes with 2+ bathrooms that need simultaneous hot water. A heating engineer can advise based on your hot water demand.
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