Boiler Replacement Cost
What a boiler replacement actually costs, what makes the price move, and why a survey beats a phone estimate every time.
New boilers from £1,650 + VAT
- Gas Safe registered
- 12-month workmanship guarantee
- Clear written quotations
Boiler replacement starts from £1,650 + VAT. That is a genuine starting price for a straightforward like-for-like replacement, not a headline figure that evaporates on contact with your house.
What follows is an honest explanation of what sits behind that number and what pushes it up, because “contact us for a price” is not useful when you are trying to budget.
What’s included
- Written itemised quotation before any work
- Boiler supply and installation
- Old appliance removal and disposal
- System cleanse and magnetic filter
- Commissioning, certification and handover
- 12-month workmanship guarantee
Why boiler replacement prices vary
Two houses on the same street can receive quotations hundreds of pounds apart, for entirely legitimate reasons. These are the factors that move the price:
- Boiler type. Combi, system and regular boilers differ in price and in the work required to fit them.
- Boiler output. Higher kilowatt outputs for larger properties cost more.
- Installation complexity. A tight airing cupboard takes longer than an accessible utility room wall.
- Position. Keeping the boiler where it is costs less than moving it.
- Pipework. Old, undersized or badly routed pipework may need upgrading.
- Flue requirements. Flue length, routing and terminal position all affect the work involved.
- System changes. Converting between boiler types means removing cylinders or tanks and altering pipework.
- Controls. Programmers, thermostats and TRVs, if being upgraded.
- Filters and cleaning. A magnetic filter is standard; a power flush is priced when needed.
- Additional heating work. Radiator changes or additions carried out at the same time.
The three common scenarios
Like-for-like replacement. Same boiler type in the same position, with existing pipework and flue route suitable. This is the lowest-cost scenario and typically a one-day job, starting from £1,650 + VAT.
Changing boiler type. Most often regular to combi. The cylinder and any loft tanks come out, pipework is altered, and controls change. More labour, more materials, and usually two days or more. Note that making good plaster, tiling and decoration is not included unless specifically quoted.
Relocation. Moving the boiler to a different wall or room means new gas, water and condensate runs plus a new flue route. This is the most variable of the three and depends almost entirely on the building.
What we will not do
We do not quote a firm price down the phone. Anyone who does is either padding the figure to protect themselves or will revise it upward once they arrive.
We also do not add charges mid-job for work we should have spotted at survey. Where genuinely concealed problems come to light, such as hidden corrosion, non-compliant previous work, contaminated system water, we stop, explain what we have found and agree the additional work with you before continuing.
Typical costs
| Type of work | Guide price | Notes |
|---|---|---|
| Like-for-like combi swap | From £1,650 + VAT | Same position, suitable existing pipework and flue |
| System or regular boiler replacement | From £1,650 + VAT | Cylinder retained, same position |
| Regular to combi conversion | Quoted after survey | Cylinder and tank removal, pipework alterations |
| Boiler relocation | Quoted after survey | New services and flue route |
| Power flush | Quoted after survey | Where system water is contaminated |
| Heating controls upgrade | Quoted after survey | Programmer, thermostat, TRVs |
Guide prices only. Every installation is assessed individually and a clear written quotation is provided before any work begins.
Frequently asked questions
How much does it cost to replace a boiler?
From £1,650 + VAT for a straightforward like-for-like replacement. Conversions, relocations and system upgrade work are quoted individually after a survey.
Why can't you give me a price over the phone?
Because the price depends on things we cannot see down a phone line: pipework condition, flue routing, mains pressure and system contamination. A survey takes a short time and produces a price you can rely on.
Is VAT included in the £1,650?
No. The figure is £1,650 plus VAT. Your written quotation will show the VAT separately.
Will the price change once work starts?
Only if genuinely unforeseen problems are uncovered, such as concealed corrosion or non-compliant previous workmanship. We discuss any additional work with you before proceeding.