By Boiler Quotes Editorial Team · Updated 20 July 2026
What Does a New Boiler Cost?
Most UK homeowners pay somewhere between £1,800 and £3,500 for a new boiler supplied and fitted. That is a wide range because the phrase "new boiler" covers everything from a straightforward like-for-like swap that takes a single day to a full system conversion that reworks the pipework in three or four rooms.
The quote you receive is really two numbers added together: the price of the boiler itself, and the labour and materials needed to fit it in your home. Understanding both halves is the fastest way to tell a fair quote from an expensive one.
| Job type | Typical fitted cost | What it involves |
|---|---|---|
| Like-for-like combi swap | £1,800 - £2,600 | Same boiler type in the same position, existing pipework reused. |
| Boiler swap with relocation | £2,400 - £3,400 | New position, so new gas, water and flue runs. |
| Conventional to combi conversion | £2,800 - £4,000 | Cylinder and tanks removed, system redesigned and rebalanced. |
| Back boiler removal and replacement | £3,000 - £4,500 | Fireplace work, flue changes and a full system upgrade. |
These are guide ranges for a typical UK home. Larger properties, awkward access and high-end appliances all push the figure up, which is exactly why comparing several quotes for the same job is worth the ten minutes it takes.
The Boiler Itself: What You Pay for the Appliance
The appliance is usually the smaller half of the bill. Gas combi boilers from mainstream manufacturers generally cost £600 to £1,500, with premium models running to £2,000 or more.
- Budget range (£600 - £900): reliable, efficient boilers with shorter warranties, typically two to five years.
- Mid range (£900 - £1,400): the sweet spot for most homes, with better hot water performance and warranties around seven to ten years.
- Premium range (£1,400+): quieter operation, stainless steel heat exchangers, smart controls included and the longest warranties available.
Paying more for the appliance is not automatically the right call, but it often buys a longer warranty, and a twelve year warranty on a boiler you plan to keep for fifteen years is worth real money.
Installation: What You Pay for the Work
Labour and materials usually account for £500 to £1,500 of the total. A straightforward swap is often a one day job for a single engineer. A conversion can take two or three days and involves lifting floors, removing a cylinder and making good afterwards.
A properly specified quote should include the parts that protect your new boiler and your warranty:
- System flush: a chemical or power flush to clear sludge and debris from existing radiators and pipework.
- Magnetic filter: catches circulating debris, and is a warranty condition for several manufacturers.
- Flue and any extension kits needed to reach an external wall safely.
- Controls: a room thermostat and timer, or a smart control, as required by the regulations.
- Removal and disposal of the old boiler, cylinder and tanks.
- Making good: plasterwork, boxing in and tidying pipe runs.
What Drives the Price Up or Down
Two homes on the same street can receive quotes hundreds of pounds apart. These are the factors that usually explain the gap.
- Changing the boiler type: moving from a regular boiler to a combi means removing the cylinder and tanks and reworking the system, which adds a day or more of labour.
- Moving the boiler: a new position needs new gas, water, condensate and flue runs. This is one of the biggest single cost drivers.
- Boiler size: a 24kW combi costs less than a 35kW model, though fitting a boiler that is too small to satisfy your hot water demand is a false economy.
- Condition of the existing system: old steel radiators, sludge and undersized pipework may need attention before a new boiler will run efficiently.
- Where you live: labour rates in London and the South East sit noticeably above the rest of the UK.
- Time of year: demand spikes when the weather turns, so quotes obtained in late autumn are rarely the keenest of the year.
Are There Extra Costs to Watch For?
Most disputes about boiler quotes come down to what was assumed rather than what was written. Before you accept a price, check whether it includes a power flush, a filter, the controls, scaffolding if the flue is high up, any asbestos checks in older properties, and making good. Ask whether the figure quoted includes VAT, and confirm the warranty length in writing along with anything you must do to keep it valid.
It is also worth asking who registers the installation. Your installer should notify Building Control and issue a Building Regulations compliance certificate, along with the manufacturer's warranty registration. Those documents matter when you come to sell the house.
Is a New Boiler Worth the Money?
If your current boiler is more than twelve to fifteen years old, it is likely running at between 60 and 80 percent efficiency, which means a meaningful share of the gas you buy is going up the flue. A modern condensing boiler operates at around 92 to 94 percent. On a typical annual heating bill, that difference alone can be worth a few hundred pounds a year, before you count the repairs you are no longer paying for.
The other half of the value is reliability. A boiler that fails in January is not just an expense, it is a cold house and an emergency call-out at emergency prices. Replacing on your own timetable, with several quotes in hand, is almost always cheaper than replacing in a hurry.
Ready to find out what a new boiler will cost for your home? Compare free, no-obligation quotes from up to 3 Gas Safe registered installers using the form below.
