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Boiler, radiators, pipework, controls and labour — the 2026 trade-pricing reference for UK homes.
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Below-market quotes
If a quote is significantly below all others, investigate. Often cheap parts, no power flush, no warranty paperwork.
VAT excluded
Some quotes don't include VAT. Compare like-for-like.
Power flush excluded
Required for warranty. Adding later costs more.
Filter excluded
Required by Worcester Bosch/Vaillant warranty. Adding later costs more.
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
Combi boiler replacement (like-for-like)Same location, no upgrade
£2.2k–£3.8k
System boiler replacementPlus cylinder check
£2.8k–£4.5k
Full central heating new install3-bed semi, 8–10 radiators
£3.8k–£7.5k
Boiler service (annual)Gas Safe registered
£80–£200
Boiler repair calloutDiagnostic plus parts
£80–£400
Out-of-hours emergencyEvening/weekend
£180–£400
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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UK central heating prices vary by region and contractor. This reference helps you spot fair quotes and avoid being overcharged. All prices include VAT, parts, and installation labour for 2026.
What Does the Work Involve?
This is a pricing reference — see individual guides for full process. Prices assume a Gas Safe registered engineer working at normal hours, using brand-name parts, with manufacturer-accredited install where applicable. London/SE typically 15–25% above national average.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Combi boiler replacement (like-for-like) | 2,200 | 3,800 | Same location, no upgrade |
| System boiler replacement | 2,800 | 4,500 | Plus cylinder check |
| Full central heating new install | 3,800 | 7,500 | 3-bed semi, 8–10 radiators |
| Boiler service (annual) | 80 | 200 | Gas Safe registered |
| Boiler repair callout | 80 | 400 | Diagnostic plus parts |
| Out-of-hours emergency | 180 | 400 | Evening/weekend |
| Power flush (3-bed) | 400 | 800 | Whole system |
| MagnaClean filter add | 180 | 300 | Plus filter |
| Smart thermostat (Hive, Nest, Tado) | 150 | 400 | Fitted |
| Radiator replacement (each) | 180 | 600 | Designer adds 50–200% |
| Heat pump installation (after grant) | 2,500 | 15,000 | Net after £7,500 BUS |
| Whole-house UFH new build | 5,500 | 10,000 | ~100m² |
| Hot water cylinder replace | 800 | 2,500 | Unvented |
| Hard water softener (Harvey) | 1,500 | 2,500 | Fitted |
How Long Does It Take?
See individual guides. Average UK central heating refurbishment: 4–7 days for a 3-bed semi.
DIY or Professional?
All boiler-side work is Gas Safe registered. Some radiator work is DIY-able for confident householders.
Choosing the Right Tradesperson
Gas Safe registered. Manufacturer-accredited installer for new boilers (Worcester Bosch Approved, Vaillant Advance). Get 3 quotes for like-for-like spec. Insist on written quote with brand, parts, warranty period.
UK Regulations
Gas Safety regulations. Building Regs Part L (efficiency), Part J (combustion safety), Part P (electrical). Boiler Plus efficiency upgrade mandatory.
Common Problems With Quotes
- Below-market quotes: If a quote is significantly below all others, investigate. Often cheap parts, no power flush, no warranty paperwork.
- VAT excluded: Some quotes don't include VAT. Compare like-for-like.
- Power flush excluded: Required for warranty. Adding later costs more.
- Filter excluded: Required by Worcester Bosch/Vaillant warranty. Adding later costs more.
Frequently Asked Questions
How much should a boiler replacement cost in 2026?
£2,200–£3,800 for like-for-like combi. Add £150–£500 for smart thermostat (Boiler Plus). Add £180–£300 for filter. Add £400–£800 for power flush if needed.
Why do quotes vary so much?
Boiler brand and warranty, installer accreditation, what's included (flush, filter, smart stat), warranty length, location.
What payment structure is normal?
25% deposit, balance on completion. Avoid 50%+ deposits. Some installers offer 0% finance (12–24 months).
Will my insurance pay for boiler replacement?
Building insurance: no, unless caused by insured event (e.g. storm damage to flue). Boiler cover plan: depends on policy.
Can I get a grant?
Boiler replacement: no (gas-to-gas). Heat pump: £7,500 BUS grant available. Insulation: ECO4 and GBIS for qualifying households.
How long should the warranty be?
Worcester Bosch Approved Installer: 10 years on boiler. Vaillant Advance: 7–10. Get the warranty paperwork signed and lodged with manufacturer.
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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