How much does a new boiler cost in London?
A 2026 guide to combi boiler replacement and installation costs in London.
Boiler installation in London costs more than most of the UK, reflecting higher labour rates and, in flats and older homes, trickier access. Here is what to expect in the capital in 2026.
Typical London boiler costs
| Job | Typical London cost (2026) |
|---|---|
| Combi boiler (supply + fit, like-for-like) | £2,000–£4,000 |
| Labour only (standard swap) | £600–£900 |
| System / conventional to combi conversion | £4,000–£5,000+ |
| Moving the boiler to a new location | add £400–£700+ |
| Power flush | £350–£600 |
These are typical London guide prices for 2026 and will vary by job, borough and property. Always get written quotes for your own project.
What affects the cost?
- The make, model and output of the boiler
- Whether it is a straight swap or a relocation
- ULEZ and parking for the engineer
- The age and condition of the system
- Flats and access in London blocks
- Central versus outer London borough
Boiler costs across London
Boiler installation in London costs more than most of the UK, reflecting higher labour rates and, in flats and older homes, trickier access. Any engineer working on your gas boiler must be on the Gas Safe Register.
How to get a fair price in London
Only use a Gas Safe registered engineer — ask to see the card. Get a written quote covering the boiler, labour and any extras. See our full UK new boiler cost guide for national comparison.
Frequently asked questions
How much is a new combi boiler in London?
In London, a like-for-like combi replacement typically costs £2,000–£4,000 including installation, with labour alone around £600–£900 — above the national average.
Who can install a gas boiler in London?
Only a Gas Safe registered engineer may legally work on a gas boiler. Always ask to see the Gas Safe ID card before work begins.
Can I get help with a new boiler in London?
Schemes such as the Boiler Upgrade Scheme can support energy-efficient replacements. A Gas Safe engineer can advise on eligibility.
Need a boiler engineer in London?
Compare independent London boiler engineers by service and location, and request quotes with confidence.
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