Choose the job and a size, and the calculator below gives a typical UK range. It covers all six boiler jobs on this site: installation, replacement, combi installation, repairs, servicing and relocation.
The sizes mean three things. Small is a simple job, a minor fix or a standard service. Typical is a standard swap, a mid-size repair or a move to another room. Large is a whole-system install, a conversion or a major repair.
The figures come from typical UK ranges. Radiator count, flue route, access and the boiler you choose can all move a price outside them, so use the result to sense-check quotes, not replace them.
Want to see what sits behind a range? Read the full guides for gas boiler installation, a new boiler and combi installation. When you're ready, you can request up to four free quotes from Gas Safe registered engineers near you.
Frequently asked questions
How accurate is the boiler cost calculator?
It shows typical UK ranges, so it's a sensible starting point. A written quote after a survey is the only figure that counts.
Does the calculator include VAT?
Treat the ranges as a guide. Ask each engineer to state whether their quote includes VAT, labour, materials and any exclusions.
Why is the range for installation so wide?
Radiator count, gas pipe length, flue route and whether a cylinder is involved all change the work, so the same service can vary a lot between houses.
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