UK 2026 · Supplied & Fitted Prices
Boiler Installation Cost UK Guide
Compare parts and labour for combi, system and conventional boiler replacements, then adjust the estimate for your home.
Heating System (Boiler, Radiators & Repair) Cost Calculator
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Estimated cost in Manchester/Liverpool
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per job · Manchester/Liverpool
Guide price based on 2026 UK market data, updated October 2026. Confirm the final cost with written quotes.
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The short answer
In 2026, a new combi boiler in the UK costs £1,900–£3,200 supplied and fitted, and a system boiler £2,300–£3,800. London and the South East run 10–15% higher (roughly £2,200–£3,700 for a combi), while the North East, Scotland and Northern Ireland run 10–18% lower. Around half the bill is the boiler and parts, and half is the Gas Safe engineer's labour. Prices climb when the boiler moves position, when a conventional system is converted to a combi, or when the gas supply pipe needs upgrading.
Boiler installation cost by job type
Typical UK 2026 prices including VAT, Gas Safe certification and Building Regulations notification.
| Job type | Boiler & parts | Labour | Total fitted | Time on site |
|---|---|---|---|---|
| Combi boiler — like-for-like swap | £900–£1,500 | £450–£800 | £1,900–£3,200 | 4–8 hours |
| System boiler install | £1,100–£1,800 | £600–£1,100 | £2,300–£3,800 | 1–2 days |
| Conventional (regular) boiler | £1,000–£1,700 | £700–£1,200 | £2,400–£4,000 | 1–2 days |
| System → combi conversion | £1,000–£1,600 | £1,000–£1,700 | £2,900–£4,600 | 2–3 days |
| Boiler relocation (new room) | £950–£1,600 | £900–£1,500 | £2,600–£4,200 | 2 days |
| Back boiler removal + combi | £950–£1,600 | £1,100–£1,900 | £3,000–£4,800 | 2–3 days |
Boiler unit price by brand
| Brand tier | Unit price (24–30 kW combi) | Typical warranty |
|---|---|---|
| Ideal / Baxi (budget) | £750–£1,150 | 7–10 years |
| Vaillant (mid-range) | £950–£1,450 | 10 years |
| Worcester Bosch (premium) | £1,100–£1,700 | 10–12 years |
| Viessmann (premium) | £1,050–£1,650 | 10 years |
What drives the price up or down
- Position change — moving the boiler adds £600–£1,200 in pipework, flue and making-good work.
- System type — removing a cylinder and loft tanks for a combi conversion adds a day of labour plus waste removal.
- Gas supply — older homes on 15 mm gas pipe often need a 22 mm upgrade (£150–£350).
- System condition — a sludged system needs a power flush (£350–£650) before the warranty is valid.
- Region — London and the South East run 10–15% above the UK average; the North East, Scotland and Northern Ireland run 10–18% below.
- Controls — a smart thermostat, TRVs and weather compensation add £200–£500 but cut running costs.