Boiler Installation Cost Calculator
Find out what a new boiler would cost for your home, including supply, installation, and potential extras. Tell us about your property and we will give you an honest estimate straight away - no email needed.
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How this calculator works
Our boiler cost calculator uses current UK pricing data to estimate what you would pay for a new boiler, fully installed. You tell us your property type, the number of bedrooms and bathrooms, your preferred boiler type (combi, system, or heat-only), and your region. The tool then calculates a realistic price range covering the boiler unit, installation labour, and any additional work such as flue routing, pipework modifications, or system upgrades.
We factor in regional labour rate differences across England, Scotland, Wales, and Northern Ireland, as well as the complexity of your installation. A straightforward like-for-like swap costs less than changing boiler type or relocating the unit to a different part of the house. The calculator also flags whether you are likely to need extras such as a magnetic filter, a new thermostat, or chemical flush.
These estimates are intended for budgeting purposes and should give you a solid starting point before getting quotes. Actual costs will vary depending on your specific property, access, the brand of boiler you choose, and the installer you go with. We always recommend getting at least three quotes from Gas Safe registered engineers before committing.
Common questions
How much does a new boiler cost in the UK in 2026?
A new boiler costs between £1,500 and £3,500 fully installed in 2026, depending on the boiler type, property size, and location. A standard combi boiler replacement typically costs £1,500 to £2,800, while a system boiler ranges from £2,200 to £3,500.
What type of boiler do I need?
For most UK homes with one bathroom, a combi boiler is the best choice - it heats water on demand and takes up less space. If you have two or more bathrooms, a system boiler with a hot water cylinder handles simultaneous demand better. Heat-only boilers suit older properties with existing gravity-fed systems.
How long does it take to install a new boiler?
A straightforward like-for-like combi boiler swap usually takes one day. If you are changing boiler type (e.g. from a heat-only to a combi) or moving the boiler to a new location, expect two to three days. Complex system changes with extensive pipework can take up to four days.
Do I need a Gas Safe engineer to fit a boiler?
Yes, it is a legal requirement. All gas boiler work in the UK must be carried out by a Gas Safe registered engineer. They will self-certify the work under the Competent Persons Scheme and notify your local Building Control. Always check your installer's Gas Safe ID at gassaferegister.co.uk before they start work.