Boiler replacement prices at a glance
Typical UK prices including labour, as a guide only. Costs vary by area, access, materials and the condition of the property, so always get a written quote.
What affects the cost?
- Boiler make, output (kW) and warranty length
- Whether the boiler moves or the flue needs re-routing
- Gas pipe upgrades to meet current regs
- Condensate routing and filter/controls
- Powerflush and radiator condition
- Your region: London and the South East cost more
Example itemised quote
This is what a professional boiler replacement quote looks like when it's broken down line by line, so you can compare like for like.
Instant-Estimate for heating engineers →EXAMPLE QUOTE
Combi boiler replacement & relocation
"Swap the old Baxi for a 30kW combi, new flue and magnetic filter, powerflush the system, move the boiler into the airing cupboard."
30kW combi boiler with 10-year warranty
1 item × £1,350.00
£1,350.00
Flue kit, magnetic filter & controls
1 set × £320.00
£320.00
Powerflush (8 radiators)
1 item × £380.00
£380.00
Relocate pipework to airing cupboard
1 lot × £450.00
£450.00
Labour: install, commission & register
2 day × £350.00
£700.00
Illustrative prices. Instant-Estimate uses your own labour rate and price library, and quotes work with or without VAT.
Common questions
How long does a boiler replacement take?
A straight combi swap usually takes one to two days. Conversions and relocations take two to four days.
Do I need a Gas Safe engineer?
Yes. In the UK all gas boiler work must be done by a Gas Safe registered engineer, who will register the new boiler with Building Control.
For contractors
Quote jobs like this in 2 minutes
Snap a few photos, describe the boiler replacement out loud, and Instant-Estimate builds the itemised quote for you, priced with your own rates.
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