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.
Boiler Installation Cost Calculator results
Fill in the details and select Calculate to see your figures.
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Tradehand is the software your trade business runs on, with an assistant that answers every call and message, sends your quotes the same day and chases them until they land. The first £10,000 Tradehand collects for a business carries no Tradehand fee. After that, Tradehand earns 5% of collected invoice payments. No monthly fee, setup fee, card fee or contract.
Get startedHow 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 the Boiler Installation Cost Calculator works
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.
Your assistant sends the quotes, chases the invoices, books the work and keeps your customers updated. The first £10,000 Tradehand collects for a business carries no Tradehand fee. After that, Tradehand earns 5% of collected invoice payments. No monthly fee, setup fee, card fee or contract. One office hire costs about £25,000 a year, whether the invoices land or not.
Source: Office manager salary, National Careers Service
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