New Boiler Cost in London (2025): What People Actually Pay
If you’re here, chances are something’s gone wrong. Maybe the boiler’s losing pressure every few days. Maybe it’s making that low banging noise you’ve been ignoring for months. Or maybe it just stopped one morning when the weather dipped and London traffic was already bad enough.
This page is the straight version of the answer: what a new boiler really costs in London in 2025, and why two “similar” homes can be £1,500 apart. No “from £999” bait, no mystery add-ons, no pretending every install takes the same amount of work.
Everything below is based on jobs we actually do — flats near Seven Sisters Road, Victorian terraces off the North Circular, tower blocks where parking alone adds an hour.
Want a fast, honest price range for your place? Call 07727 154746 and speak to someone who fits boilers for a living.
So, how much does a new boiler cost in London?
In 2025, the typical boiler replacement cost in London — boiler + correct installation — usually lands between £2,300 and £4,800.
The range isn’t random. It’s driven by the same few things every time: the boiler type, what you’re replacing, whether pipework and controls need upgrading, how awkward access is, and whether the system needs cleaning properly. If you want the “why” in plain English, read why new boiler prices vary so much.
| Boiler type | Typical total cost | Where we usually see it |
|---|---|---|
| Combi boiler | £2,300 – £3,800 | Flats & smaller houses |
| System boiler | £2,800 – £4,500 | Homes with cylinders |
| Regular boiler | £2,900 – £4,800 | Older tank-fed systems |
| Back boiler conversion | £3,200 – £5,200 | Fireplace removals |
If you’re comparing quotes and one looks suspiciously cheap, it’s usually because something important has been “left out”. That’s common in London — here’s exactly why cheap boiler installation quotes often fall apart.
And if you want to understand what should be included in a proper figure, here’s a breakdown of the costs people miss when getting a new boiler.
Supporting boiler cost guides (quick answers)
If you’re trying to make a decision quickly, these cover the exact points that usually change the final price.
- Why new boiler prices vary so much The real factors that move the price (not just the brand).
- Why cheap boiler quotes fall apart in London What gets “forgotten” until you’re already committed.
- Repair vs replace: what’s cheaper long-term? When repairing is sensible—and when it becomes a money pit.
- Labour vs boiler cost: where your money actually goes What you’re paying for on the day (and why it matters).
- Costs people miss when getting a new boiler Filters, flushing, controls, upgrades, access—what should be included.
- How property type affects boiler replacement cost Flats vs terraces vs townhouses—layout and access change everything.
- How to get an accurate boiler quote (fast) Exactly what to send so you don’t get vague “from” numbers.
- Top 10 boiler installation mistakes (and how to avoid them) The common errors that cause call-backs, failed compliance checks, and extra costs later.
Combi boiler cost in London (what most people end up choosing)
In London, combis are everywhere. We fit them in flats above shops on Leytonstone High Road, in small terraces near Stratford, and in houses where the loft tank hasn’t been touched since the 90s.
A realistic combi boiler cost usually breaks down like this:
- Boiler unit itself: usually £900 – £1,800
- Installation, controls, flushing, testing: £1,200 – £2,000
Put together, the normal cost to replace a combi boiler lands between £2,300 and £3,800. Same-position swaps sit lower. Moving it, upsizing the gas pipe, or sorting old pipework pushes it up.
If you want the deeper numbers (and what actually changes them), see our combi boiler installation prices guide.
Boiler installation cost on its own (labour, compliance, and the messy bits)
When people ask about boiler installation cost, they’re usually trying to separate labour from the boiler itself. In London, that labour figure is heavily affected by access, parking, and how much needs bringing up to standard.
For a straightforward swap, labour typically sits between £1,000 and £1,700. That includes removing the old boiler, fitting the new one, flushing, testing, registering it, and staying on site until it’s running properly.
If you want a plain breakdown of where your money actually goes, read labour vs boiler cost (where your money actually goes). And if you’re trying to avoid the classic “looks fine on paper, turns into a headache” scenario, it’s worth skimming the most common boiler installation mistakes (and how to avoid them).
Conversions, relocations, and back boiler removals take longer. There’s no shortcut around that, no matter what an advert says.
What makes your quote go up or down?
Most London quotes move for predictable reasons. Here are the big ones:
- Property type and access: flats, lofts, tight cupboards, parking restrictions. (More on how property type affects boiler replacement cost.)
- Pipework and upgrades: gas pipe sizing, old valves, tired radiators, failing controls.
- System condition: sludge, blocked heat exchangers, radiators that never heat evenly.
- Location changes: moving the boiler, rerouting flues, or correcting non-compliant setups.
If you want a quote that doesn’t change on the day, follow this quick guide to getting an accurate boiler quote.
Who’s behind this page?
This guide is written by ARA Services Ltd. We’re based in East London and spend most days moving between places like Forest Gate, Stratford, Hackney and up towards Enfield when the North Circular allows it.
Every boiler we install is fitted by a Gas Safe registered engineer. We’ve been doing this long enough to recognise the same problems repeating themselves — undersized gas pipes, sludge-filled systems, boilers shoved into cupboards with no ventilation.
This page is basically what we explain at kitchen tables while an old boiler cools down and someone asks, “So… what am I actually looking at cost-wise?”
If your boiler’s packed in and you’re near Stratford, Leyton, or anywhere off the A12, call 07727 154746. We’ll tell you honestly whether it’s a repair or replacement situation.
Questions we get asked all the time
Is it ever worth repairing instead of replacing?
Sometimes, yes. If the boiler’s under 8–10 years old and parts are still available, a repair can make sense. Once parts become scarce or faults repeat, replacement usually wins long-term. If you want to weigh it properly, read repair vs replace (what’s cheaper long-term).
Why are London prices higher than the rest of the UK?
Access, parking, congestion, older housing stock, and stricter compliance expectations. A job that takes one day elsewhere can stretch to two here — especially when fixes and upgrades are needed to meet current standards.
Do I need a survey before getting a price?
Not always. Clear photos and honest answers usually get us close. If something looks unusual, we’ll say so upfront. To avoid wasting time, follow this quick checklist for an accurate boiler quote.
What paperwork should I receive?
Gas Safe certificate, manufacturer registration, and a benchmark log. If you don’t get those, something’s wrong.
If you want a calm, straight conversation about your boiler — not a sales script — call 07727 154746 or use this contact page. We’ll tell you where you stand.