Calculate your new boiler cost
New boiler cost in London
Common boiler extras
What can change a real London quote?
- Combi, system, conventional or alternative boiler type
- Like-for-like replacement versus system conversion
- Boiler output and brand
- Moving the boiler or changing the flue route
- Controls, filter and system cleaning
- Pipework, cylinder or radiator alterations
- Region and installation complexity
Local planning considerations
Dense access, parking, deliveries and contractor overheads can widen the spread between quotations, so use the figures as an early budget rather than a quote.
- Allow separately for parking, loading, permits or restricted delivery windows where a property has difficult street access.
- Flats and managed buildings can add landlord, freeholder or building-management requirements that are outside a basic works estimate.
- Party-wall, structural and access costs should be checked independently on extensions, lofts and major internal alterations.
How the regional model works
The 1.28× factor is applied to installed boiler work. Supply-only appliance prices and small equipment extras remain national benchmarks so the page does not imply every component varies with local labour conditions.
Sources
New Boiler Costs in 2026: Prices & Installation
Published / checked: March 2026
Used for: Combi, system and conventional boiler supply-and-install benchmarks
Moving a Boiler: Cost Breakdown 2026
Published / checked: June 2026
Used for: Boiler relocation, controls, filters and pipework allowances
Frequently asked questions
How much does a new boiler cost in London in 2026?
A like-for-like combi replacement is currently £2,500–£4,000 nationally including supply and installation. The modelled London range is about £3,200–£5,100.
What is the broader installed boiler range in London?
Current UK guidance puts broader installed projects around £3,000–£15,000. The model gives about £3,850–£19,200.
Does the London model change the boiler appliance price?
The local model is most useful for the installed project total. Supply-only appliance prices are shown separately and are not treated as a city-specific market average.
Why can boiler quotes differ so much?
Boiler type, output, system conversion, relocation, flue route, controls, filters, cylinder work, pipework and radiator changes can materially change the total.