Free Boiler Installation Cost Calculator
Estimate the installed cost of a new boiler in the UK by boiler type, with power flush, smart controls, relocation and region factored in.
A realistic UK boiler installation cost estimate covering the boiler, labour and parts. Choose the boiler type (a like-for-like combi swap, a system or regular boiler, or a conversion to a combi), add the common extras like a power flush or moving the boiler, and set your region to see a low-to-high price range built from current UK cost-guide figures.
Results
Fill in the details and select Calculate to see your figures.
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Get a free demoHow to use the Boiler Installation Cost Calculator
- 1Pick the boiler job: a like-for-like combi swap is cheapest; a conversion to a combi costs more because of the extra pipework and removing the old cylinder.
- 2Toggle on the extras you need: smart controls, a power flush to clean the system, or moving the boiler to a new spot.
- 3Set your region: no published UK boiler cost guide states a regional multiplier, but labour rates run higher in London and the South East, so this calculator applies a working +25% adjustment there.
- 4Read the from / typical / up-to range. Use it to sense-check quotes; always get two or three fixed quotes from Gas Safe registered installers before committing.
How to work it out yourself
There's no formula for a boiler install; it's the boiler unit plus labour plus parts, with a few big swing factors. Start from the type's typical band and add the extras.
- Combi like-for-like swap: roughly £1,800-£4,000 installed.
- Add a power flush (£600) and smart controls (£250): £2,650-£4,850.
- In London/SE (×1.25): about £3,300-£6,100.
- The boiler unit itself is usually 40-60% of the bill; labour is £750-£1,250 for a straightforward swap.
These bands are Tradehand's own working estimate, built around Heatable's median £2,300 for a like-for-like combi swap (updated 20 July 2026) and Boiler Guide's £1,600-£5,500 installed range for system/conventional boilers (updated 23 May 2025). Not a quote; the exact figure depends on the boiler make/model, your system's condition, and access. Always get fixed quotes from Gas Safe registered installers.
Typical UK benchmarks
| Combi like-for-like swap | Median £2,300 from 2,000 UK quotes Jan-Jun 2026, most straightforward swaps £1,800-£3,500 (Heatable, New Boiler Costs Explained, updated 20 July 2026) |
| System boiler | £1,600-£5,000 installed, average £3,300 (Boiler Guide, Cost of a New Boiler, updated 23 May 2025) |
| Conventional / regular boiler | £1,600-£5,500 installed, average £3,550 (Boiler Guide, Cost of a New Boiler, updated 23 May 2025) |
| Power flush | £350-£800 (Checkatrade, Power Flush Cost guide, updated June 2026) |
| London / SE premium | No published UK boiler cost guide states a regional multiplier; the +25% this calculator applies is Tradehand's own working adjustment for higher South East labour rates, not a cited statistic |
Disclaimer
This tool gives an estimate for general guidance only, based on typical UK figures and the details you enter. It is not a formal quote, survey, or professional advice. Always confirm with a qualified tradesperson before relying on any figure, as regional prices, site conditions, and current standards vary.
You do the job, Tradehand handles everything around it.
Tradehand sends the quotes, chases the invoices, books the work and keeps your customers updated, for no monthly fee and 5% of an invoice only once the customer has paid. One office hire costs about £25,000 a year, whether the invoices land or not.
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Get a free demoFrequently asked questions
How much does it cost to install a new boiler in the UK?
Heatable's analysis of 2,000 UK quotes (Jan-Jun 2026) puts the median like-for-like combi swap at £2,300, with most straightforward swaps £1,800-£3,500. Boiler Guide (updated 23 May 2025) prices system boilers at £1,600-£5,000 installed (average £3,300) and conventional boilers at £1,600-£5,500 (average £3,550). Converting to a combi from a conventional system costs more, often £3,000-£5,700 in Tradehand's estimate, because of the extra pipework and removing the old cylinder and tanks.
Why is converting to a combi more expensive than a swap?
A like-for-like swap reuses the existing pipework and location. A conversion means removing the hot water cylinder and cold tanks, re-routing pipework, and often adding a new condensate and flue run, typically £500-£1,500 more than a straight swap, plus 1-2 extra days of labour.
What extras add the most to the price?
Moving the boiler to a new location (£500-£1,000 in Tradehand's estimate), a power flush to clean a sludgy system (£350-£800, Checkatrade Power Flush Cost guide, updated June 2026), and upgrading controls to a smart thermostat (£150-£300). A magnetic filter, new flue, or a new cylinder can each add a few hundred pounds too.
How much of the cost is labour?
There's no single published UK split of unit versus labour cost for a boiler install; as a working estimate the boiler unit itself is usually 40-60% of the total, with labour making up most of the rest. Labour for a standard swap is typically £750-£1,250 over one day; conversions and relocations take 1.5-2.5 days, so labour is higher.
Does location affect the price?
No published UK boiler cost guide states a regional multiplier, but tradespeople's day rates run higher in London and the South East than in the Midlands, North and rural areas, so this calculator applies a working +25% adjustment there. The boiler unit costs the same everywhere, so the regional difference shows up mainly in the fitting charge.
How can I quote boiler jobs faster and win more of them?
Speed and clarity win boiler work; the first fixed, professional quote usually gets the job. Tradehand gives you an office team that captures the enquiry, gets your quote out same-day, and chases the customer for a decision, so fewer leads go cold. Get a free demo to see it on your own jobs.
