How much does a new boiler cost in the UK?
A new boiler costs £3,000 on average in the UK. Most jobs fall between £1,800 and £4,800 supplied and fitted. Type of job: Combi for combi swap £1,800 to £2,800; System £2,500 to £3,600; Convert or relocate £3,300 to £4,800. Prices reviewed June 2026.
A new boiler is priced by the type of swap and the brand. A straight combi-for-combi replacement is cheapest, and moving the boiler or changing system type costs more.
New boiler cost calculator
Use the calculator to price your new boiler in 2026. Adjust the options and area for a UK cost range. Nothing is sent anywhere.
You have seen the guide range of £1,800 to £4,800. Here is how to get a firm number without chasing three quotes.
Costwise may earn a commission if you get a quote or buy through this link, at no extra cost to you. It never changes our prices or what we suggest.
New boiler cost breakdown
Typical new boiler costs, by option:
| Type of job | Typical UK cost |
|---|---|
| Combi for combi swap | £1,800 to £2,800 |
| System / conventional swap | £2,500 to £3,600 |
| Convert or relocate | £3,300 to £4,800 |
| + Premium brand, 10 year warranty | add £400 to £900 |
What's included in the price?
Typical new boiler prices include:
- The boiler and standard flue
- Installation and commissioning
- A system flush
- Manufacturer warranty registration
What changes the price?
The things that move new boiler prices most:
Combi swap versus changing to or from a system boiler
Brand and warranty length
Whether the boiler is moved to a new location
Controls, filters and any pipework changes
How the price is built up
The bulk of the price is the boiler itself plus the engineer's time, and a straight combi swap in the same spot is the cheapest route because the existing pipework, flue and gas supply usually stay put, which is why these jobs land near the £1,800 floor. Costs build up from there as the work grows: a system or regular-to-combi conversion means removing the hot water cylinder and tanks and re-running pipework, while moving the boiler to a new wall or into the loft adds flue, pipe and sometimes scaffolding work. A longer manufacturer warranty, a magnetic filter, a chemical flush and new smart controls each add to the total and push a fuller job towards £4,500. On a typical £3,000 job the boiler and parts account for roughly £1,400 to £1,900, with the rest going on one to two days of Gas Safe labour, so the split is fairly even and tilts towards materials on premium models.
Ways to keep the cost down
- Keep the boiler in its existing location if you can, since relocation alone typically adds £400 to £1,400 in flue and pipework.
- Get three fixed quotes from local Gas Safe engineers rather than a single national chain, as supply-and-fit prices for the same boiler vary widely.
- A like-for-like combi swap is the cheapest job, so only convert from a system or regular boiler if your hot water demand genuinely needs it.
- Compare a mid-range boiler with a longer warranty against a premium model, because the cheaper unit with a 10-year guarantee is often the better value over time.
Does where you live change the cost?
In London, a new boiler typically costs around £3,900 supplied and fitted, about 30% above the UK average of £3,000. In the North, Scotland and Wales the guide figure is nearer £2,800.
| Region | From | Typical | Up to |
|---|---|---|---|
| Midlands / East (UK average) | £1,800 | £3,000 | £4,800 |
| London | £2,300 | £3,900 | £6,200 |
| South East / South West | £2,100 | £3,400 | £5,500 |
| North / Scotland / Wales | £1,700 | £2,800 | £4,400 |
Guide prices supplied and fitted, scaled with the same regional multipliers as the calculator. Not quotes.
New boiler cost in major UK cities
| City | From | Typical | Up to |
|---|---|---|---|
| Belfast | £1,500 | £2,600 | £4,100 |
| Birmingham | £1,800 | £2,900 | £4,700 |
| Bristol | £2,000 | £3,300 | £5,300 |
| Cardiff | £1,700 | £2,800 | £4,500 |
| Edinburgh | £1,800 | £2,900 | £4,700 |
| Glasgow | £1,600 | £2,700 | £4,300 |
| Leeds | £1,700 | £2,800 | £4,500 |
| Liverpool | £1,700 | £2,800 | £4,400 |
| London | £2,300 | £3,900 | £6,200 |
| Manchester | £1,700 | £2,900 | £4,600 |
| Newcastle | £1,600 | £2,700 | £4,300 |
| Sheffield | £1,700 | £2,800 | £4,400 |
City guide estimates, scaled by local labour costs. Indicative averages for new boiler, not quotes.
The gap is labour. The boiler itself costs about the same everywhere.
Common questions
How much is a new combi boiler fitted?
A straight combi replacement with a mid-range brand typically costs £1,800 to £2,800 supplied and fitted. Premium brands and longer warranties cost more.
Is it worth converting to a combi?
Converting from a system or conventional boiler to a combi removes the tanks and frees up space, but it adds £700 to £1,500 to the job because of the extra pipework and controls.
How much does it cost to replace a system boiler with a combi?
Replacing a system boiler with a combi is one of the more involved jobs because the engineer removes the hot water cylinder and any loft tanks, then re-routes pipework and may need to upgrade the gas supply. Expect around £3,000 to £4,500 supplied and fitted, towards the upper end of the typical range. The exact figure depends on how far the pipework has to run and whether you also want a magnetic filter and new controls fitted at the same time.
Does moving the boiler to a new location add much to the cost?
Relocating the boiler is one of the bigger price drivers, typically adding £400 to £1,400 on top of the boiler and basic fit. The cost reflects the new flue route, extra gas and water pipework, and making good the old position. Moving it into a loft can add more again if access is awkward and scaffolding is needed. Keeping the boiler where it already sits is the single easiest way to stay nearer the £1,800 end of the range.
What is included in a typical £3,000 boiler installation?
A typical £3,000 quote covers the new boiler, the Gas Safe engineer's labour over one to two days, removal and safe disposal of the old unit, and registration of the installation with Gas Safe and the manufacturer for the warranty. Most quotes at this level also include a magnetic system filter and a chemical flush to protect the new boiler. Smart heating controls, extensive pipework changes or relocation are usually priced on top and move the job towards £4,500.
Is it worth replacing a 15 year old boiler?
Replacing a 15-year-old boiler is usually worth it, because older units often drift towards 70 to 80 percent efficiency while a new A-rated condensing boiler must run at around 92 percent, so more of your gas turns into heat. A like-for-like replacement typically costs about £3,000 supplied and fitted. Older boilers also get harder to find parts for, and repeated repairs on an ageing unit rarely pay back against a replacement.
Can I get a new boiler for free?
Free or heavily subsidised boiler replacements are available to some low-income households through the government's ECO4 scheme, which runs until 31 December 2026. Eligibility usually depends on receiving a qualifying benefit, such as Universal Credit or Pension Credit, and living in a less efficient home, often EPC band D to G. Some councils can also refer other households through ECO4 Flex, though criteria vary. Most households do not qualify and pay privately, around £3,000 fitted.
Is replacing a boiler a big job?
A like-for-like combi or system swap is usually a one-day job, sometimes stretching into a second morning. Converting from a system to a combi, or moving the boiler to a new spot, is more disruptive: typically two to three days with new pipework, flushing and commissioning. That extra labour is why a conversion or relocation runs £3,300 to £4,800 rather than the £1,800 to £2,800 of a straight combi swap.
How much is a new boiler for a 4 bedroom house?
A four-bed home usually needs a higher-output boiler, around 30 to 35kW for a combi, or a system boiler with a cylinder if there are two or more bathrooms. Expect the upper half of the range: roughly £2,400 to £3,600 supplied and fitted for a straight swap, more if you convert to a combi or relocate the boiler. Bigger homes also tend to need more radiator balancing and pipework, which is where the extra cost sits.
Can I fit a new boiler myself?
No. It is illegal to fit or replace a gas boiler in the UK unless you are Gas Safe registered, and doing it yourself is dangerous and voids the warranty and your insurance. This is why boilers are quoted supplied and fitted, with one to two days of Gas Safe labour making up much of a £3,000 job. The only DIY part is choosing the boiler; the installation has to be done by a registered engineer.
Is it worth paying for a new boiler?
As a house-value move, no, since few buyers pay extra for a boiler they expect to work. Where it earns its keep is day to day: a reliable, efficient unit cuts breakdowns and can trim running costs, which matters most if your old one is failing. At £1,800 to £4,500 supplied and fitted, replace it because the current boiler is unreliable or dead, not to add resale value.
Check they are registered before they start
Gas work is the one job on this site you should never let an unregistered person touch. It is illegal, it cannot be signed off or insured, and the risk is carbon monoxide. Checking takes about a minute and it is free.
- Find or check a registered engineer Gas Safe Register · Anyone working on gas must be on it by law. Check the 7-digit licence number on their ID card, or text their business registration number to 85080
- How to check an engineer is Gas Safe registered HSE · The regulator's own instructions, including the free 0800 408 5500 helpline
Official guidance and sources
The rules and schemes referenced on this page come from these official UK sources. The price figures are Costwise's own; see how we price.
- Gas safety: home owners HSE · By law, anyone you pay to fit or work on a gas boiler must be on the Gas Safe Register.
These are independent guide prices based on typical UK jobs in 2026. Your actual cost depends on your property, spec, access and where you live. Always get at least three written quotes before committing.