Replacing back boiler

I am buying a house with a back boiler and I would like to know the cost of replacing it with a combi boiler please in the west yorkshire area.

Asked by Julie on 16th Feb 2026
Expert Trade Answers
"To convert a back boiler to a combination boiler varies on a lot of different aspects of. Boiler location, boiler manufacturer etc.
But a rough guide would be between £3000-£5000
Hope that helps"
Answered on 23rd Feb 2026 - Member since Feb 2026 - report
"Because the pipework will have to be changed and the boiler will have to be put preferably to an outside wall to allow for a shorter flue, also the radiator circuit will have to be thoroughly cleaned of any debris to make sure that everything is running efficiently, therefore the cost will be in excess of £5,000."
Answered on 16th Feb 2026 - Member since Aug 2023 - report
"Good morning it all depends on the work needed where the new boiler can go etc I would suggest a engineer look at it. But roughly 3k."
Answered on 16th Feb 2026 - Member since Dec 2025 - report
"I’m not from that area however depending on what needs doing, boiler you chose anything from £3500 to £4500"
Answered on 16th Feb 2026 - Member since Feb 2023 - report
"Hi, your probably looking at around £3000
With a mid range 30kw combi boiler."
Answered on 16th Feb 2026 - Member since Jan 2024 - report
"I'm sorry but we dont operate in West Yorkshire. You would be well advised to arrange for an engineer to inspect before quoting"
Answered on 16th Feb 2026 - Member since Apr 2023 - report
"You would probably be looking around 3.5k-4k. Depending on where the new boiler is sited"
Answered on 16th Feb 2026 - Member since Feb 2026 - report
"Hi.
Not from the area, but depending on the extent of work required you will be looking between £4500-5500 for a full system replacement including a flush"
Answered on 17th Feb 2026 - Member since Mar 2024 - report
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