Like-for-Like Combi Boiler Replacement London
If your combi boiler is on its way out and you just want a new one fitted in exactly the same spot, this is the simplest and cheapest way to do it. From £1,050, with most jobs finished in a single day.
What "Like-for-Like" Actually Means
Like-for-like means your new combi boiler goes in the exact same spot as your old one, connects to your existing gas, water and flue pipework without any rerouting, and stays a combi rather than switching to a system boiler with a cylinder. No walls get opened up, no pipework gets extended through the house, and nothing needs relocating. It's the version of "getting a new boiler" most people actually mean when they call, and it's also the fastest and least expensive option, because the engineer isn't fighting against your house's layout — just swapping one unit for a better one in the same place.
How Much Does It Cost?
A like-for-like combi replacement in London starts from £1,050. Most other London quotes we've seen for this exact job sit anywhere between £1,800 and £3,500 — a range so wide it tells you almost nothing until someone's actually in your kitchen looking at your pipework. Our starting price reflects the simplest version of the job: same boiler type, same position, standard flue, no complications.
⚠ Why there's a £100 assessment fee, honestly explained
Even a "simple" like-for-like swap can shift in price once an engineer actually sees your boiler cupboard. Things like the exact flue type, whether your existing pipework still meets current gas regulations, corrosion on old fittings, or tight access can all change the final number. Rather than quote a price over the phone and then add extras once we arrive — something a lot of London installers do — we charge a small £100 fee for a proper in-person assessment, and give you one firm number you can actually rely on before booking anything.
Is Like-for-Like the Right Option for You?
Not every "new boiler" job qualifies as like-for-like. Here's how to tell which category your situation falls into, since it changes both the price and what's involved.
| Your Situation | What It's Called | Typical Price |
|---|---|---|
| Combi boiler → new combi, same spot | Like-for-like replacement | From £1,050 |
| Combi boiler → system boiler with cylinder | System conversion | From £3,500 |
| Old system boiler → brand new system setup | New system boiler installation | From £4,000 |
| Boiler moving to a different room | Relocation (added to like-for-like) | Confirmed at assessment |
If you're not sure which category applies to your home, send us a photo of your current boiler on WhatsApp and we'll tell you honestly — including if like-for-like isn't actually the right fit and you'd be better served by one of our other options.
What's Included in Your Like-for-Like Replacement
- ✓
Old boiler removed & disposed of
Safe isolation and removal of your existing unit, including responsible disposal.
- ✓
New boiler fitted in the same position
Connected to your existing gas, water and flue pipework, with any worn fittings replaced as needed.
- ✓
System flush & magnetic filter
Clears debris from the existing system and protects the new boiler from London's hard water, included as standard.
- ✓
Digital thermostat & controls
A modern thermostat fitted and paired, or your existing smart thermostat reconnected if you already have one.
- ✓
Gas Safe certificate, same day
Issued before the engineer leaves, along with your manufacturer warranty registration.
Why This Is the Fastest Way to Fix a Failing Boiler
No pipework rerouting
Because everything connects where it already is, there's no digging into walls or extending pipe runs — that's what keeps it fast.
Least labour-intensive job we do
Simpler jobs cost less because there's genuinely less work, not because corners are being cut on parts or safety checks.
Kitchen or cupboard stays as it is
No new holes, no relocated pipework in view — the room looks the same afterwards, just with a working boiler in it.
Heating restored same day
For anyone without hot water or heating right now, this is the quickest realistic route back to normal.
Like-for-Like Boiler Replacement — Common Questions
What does "like-for-like" boiler replacement actually mean?
Like-for-like means your new combi boiler goes in the exact same spot as your old one, connects to the existing gas, water and flue pipework without rerouting, and stays a combi rather than switching to a system boiler. No walls are opened up, no pipework is extended, and no cylinder or tank is involved. It's the simplest, fastest and cheapest type of boiler replacement.
How much does a like-for-like combi boiler replacement cost in London?
A like-for-like combi boiler replacement in London starts from £1,050, depending on the boiler model, the condition of your existing pipework and flue, and what we find during the assessment visit. There's a £100 assessment visit fee to confirm the exact price and boiler model for your home before any work is booked.
Why is there a £100 assessment fee instead of a fixed price over the phone?
Even a straightforward like-for-like swap can vary in price depending on things we can't see over the phone — the exact boiler model fitted previously, the flue type, whether the existing pipework meets current regulations, and access to the property. The £100 visit lets our engineer confirm all of this and give you one firm number, rather than a range that changes once someone actually turns up.
How long does a like-for-like boiler replacement take?
Most like-for-like combi replacements are completed in a single day, typically 4 to 6 hours, since no new pipework or flue routing is needed. You'll have heating and hot water working again the same day, with your Gas Safe certificate issued before the engineer leaves.
How do I know if my boiler qualifies for like-for-like replacement rather than a conversion?
If you currently have a combi boiler and want a new combi boiler in the same location, it almost always qualifies as like-for-like. If you're switching from a combi to a system boiler, or your current boiler is a conventional or back boiler, that's a conversion rather than a like-for-like swap, and priced differently.
Not a Straight Swap? See Our Other Options
Our Boiler Services
Get Your Assessment Booked
Send us your boiler model and postcode on WhatsApp and we'll confirm your exact like-for-like price with a £100 assessment visit.
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