How much does a new boiler cost?
A new boiler's cost depends on the type, brand and how much pipework changes. Get an indicative supply-and-fit figure below, then build it into your refurbishment schedule.
What affects boiler cost
- 1Boiler type
A combi is usually cheapest to fit; a system boiler with an unvented cylinder suits homes and HMOs with high simultaneous hot-water demand.
- 2Like-for-like vs relocation
Swapping in the same spot is quickest. Moving the boiler adds flue and pipework runs.
- 3Certification
A compliant install includes a power-flush, magnetic filter, commissioning and a Gas Safe/Building Regs notification.
New heating is one of the biggest single line items in a heavy refurbishment. If you're upgrading the whole system rather than just the boiler, budget for radiators, valves and pipework too — the full-system figure above reflects that.
New boiler costs by type (indicative, incl. fit)
| Type | Typical use | Indicative cost |
|---|---|---|
| Combi boiler swap | Like-for-like replacement | £1,800 – £3,000 |
| New combi (relocation) | Moving the boiler | £2,500 – £3,800 |
| System boiler + cylinder | Multiple bathrooms / HMO | £2,800 – £4,800 |
| Full system (boiler + rads) | Whole heating system | £3,500 – £6,500 |
Indicative supply-and-fit; brand, flue and pipework alterations move the price.
Frequently asked questions
How much does it cost to replace a boiler?+
A like-for-like combi replacement typically costs £1,800–£3,000 supply-and-fit. Relocating the boiler or upgrading to a system boiler with a cylinder costs more.
Does the price include a power flush?+
A proper installation should include a system flush and a magnetic filter to protect the new boiler — confirm it's in the quote.
Related tools & guides
Want to know how these figures are calculated? See our cost methodology.
Cost figures shown are indicative estimates, not quotations. You are responsible for verifying all costs (obtain contractor quotes) and any figures submitted to a lender. ScopeWise is a documentation tool, not financial, tax, structural or planning advice. HMO compliance prompts are guidance only — confirm requirements with your local council, as standards and licensing vary by authority.