Central Heating Installation Cost Calculator

How this calculator works

This calculator works in ranges rather than single figures, because real quotes, yields and tariffs genuinely vary that much. It starts from typical UK price, output and savings ranges drawn from published 2026 industry guides and official scheme documentation, then scales them by the quantities you enter and adjusts them for each choice you make below. The result is a low-to-high band that a realistic outcome is likely to fall within, not a promise of the figure you will achieve.

A full central heating installation costs roughly to for a typical three bedroom home in 2026 when replacing an existing system, and to or more installed from scratch, with the average full job around . Labour is 40 to 50 percent of the bill, a two-person team at to a day for four days to a week, which is why quotes should state how many engineer-days are included.

Number of radiators

Radiators and their pipework are the biggest variable in a full installation: each radiator costs roughly to to buy depending on size and style, and to fitted including pipe runs. A typical three to four bedroom house needs 8 to 10 radiators, sized room by room from heat loss calculations rather than guesswork, since an undersized radiator never warms its room however hard the boiler works.

Scope of work

Replacing an existing system reuses the pipe routes and radiator positions, keeping labour to roughly a week. Installing central heating from scratch, in a home with storage heaters, open fires or nothing, means running pipe to every room, lifting floors and chasing walls, which roughly doubles the job. First-time central heating is precisely what ECO4 funding targets for qualifying households, so eligibility is worth checking before self-funding.

Boiler brand tier

Brand moves a quote by several hundred pounds either way: budget boilers do the same job with shorter warranties of around 2 to 5 years, mid-range brands balance price against 5 to 10 year cover, and the premium names, led by Worcester Bosch and Vaillant, cost 15 to 25 percent more for industry-leading reliability records and warranties up to 12 years. Over a 10 to 15 year boiler life, a long parts-and-labour warranty is worth real money, which is why premium brands hold their price.

Where you live

Heating labour is not priced uniformly across the UK, with published guides putting London and South East installation quotes roughly 15 to 25 percent above the national average. The hardware costs the same everywhere, so the difference sits in engineer day rates, access and parking.

What else affects the figures

System design earns its money invisibly: correct boiler sizing, room-by-room radiator outputs, 15 and 22 mm pipework rather than clog-prone microbore, zoning between floors, and a proper inhibitor and filter regime determine whether the system runs efficiently for fifteen years or limps expensively. Floors matter to the price, since suspended timber floors lift easily while solid concrete means surface-mounted pipe or channelling at real cost. Every gas element is legally Gas Safe work, and the whole installation is notifiable under Building Regulations, which registered installers self-certify. If the project is from scratch or a major renovation anyway, it is the perfect moment to price underfloor heating for the ground floor and a heat pump against the gas boiler, since the wet system being designed can suit either.

Certification, planning and grid connection

Every gas boiler installation, repair or removal is legally restricted to Gas Safe registered engineers, and working on gas without registration is a criminal offence, so checking the engineer’s Gas Safe ID card and registration number is the non-negotiable first step. The installation is notifiable under Building Regulations, which registered installers self-certify, and Boiler Plus rules require time and temperature controls plus an efficiency measure on new combi installations. Flue positions and condensate drainage follow set standards worth confirming in the quote, an annual service protects both safety and the manufacturer warranty, and a carbon monoxide alarm near the boiler is cheap, sensible and in rented properties legally required.