How much does it cost to replace a boiler in Durham?
Updated October 2026 · Prices include VAT and are typical ranges, not quotes.
Short answer: a like-for-like combi boiler swap in Durham typically costs £1,800–£3,000, fitted. Changing to a different type of boiler, or moving it, usually costs £2,300–£5,700.
These are the ranges national price guides give for homes outside London and the South East, where prices run about 10–20% higher, mostly because of labour. Durham sits in that lower band, so most local quotes should land inside these ranges.
Typical boiler replacement costs
| Job | Typical cost (fitted) |
|---|---|
| Like-for-like combi swap (same place) | £1,800–£3,000 |
| New conventional (heat-only) boiler | £2,300–£4,500 |
| New system boiler | £2,500–£5,000 |
| Converting a regular or system boiler to a combi | £2,300–£5,700 |
| Back boiler to combi | £3,500–£5,000 |
Ranges from Fantastic Services (Sept 2026, rest of UK) and Heatable (Apr 2026). The price normally includes the boiler, fitting, removing the old one, basic controls and commissioning.
How long it takes
- Like-for-like swap: usually done in a day (around 4–6 hours of work).
- Changing boiler type: about 1.5–3 days, as pipework and tanks change too.
- Moving the boiler: usually 1–2 days.
Extras that can add to the bill
| Extra | Typical cost |
|---|---|
| Magnetic system filter | £100–£250 |
| Chemical system flush | £100–£150 |
| Smart thermostat or controls | £100–£300 |
| Vertical flue (out through the roof) | £300–£600 |
| Moving the boiler to a new spot | about £750 |
| Thermostatic radiator valves | £70–£140 per radiator |
| New radiator | about £200 each |
From Heatable and MyJobQuote (Oct 2026). Some installers include a filter and flush in the price, so check before comparing quotes.
What affects the price in Durham
- The type of system you have now. Older terraced homes, common across County Durham, are more likely to have a back boiler or tanks in the loft. Converting these to a combi puts you at the top of the range.
- Boiler size and brand. Bigger homes need a more powerful boiler, and premium brands with longer warranties cost more up front.
- Where it goes. Keeping the boiler in the same place, with the same flue, is the cheapest option.
- Local or national installer. Using a local engineer can save £500–£1,500 in labour compared with national companies, according to MyJobQuote.
- Time of year. Heating engineers are busiest in winter. Booking in spring or summer can be cheaper and easier.
What to ask before you book
- Are you Gas Safe registered? Anyone working on a gas boiler must be. Ask to see their ID card and check it on the Gas Safe Register.
- Can I have an itemised written quote? It should list the boiler model, labour, removal of the old boiler, and any filter, flush, controls or flue work.
- How long is the warranty, and what keeps it valid? Most need a yearly service.
- Will you register the installation with Building Control? This should be included.
- How long will I be without heating and hot water?
Common questions
Should I get a combi boiler?
A combi heats water on demand, with no tank, so it suits most homes with one bathroom. Larger homes with two or more bathrooms in use at once are often better with a system boiler and a hot water cylinder. A good engineer will advise on your home.
Will I be without heating for long?
For a like-for-like swap, you'll usually have heating and hot water back the same day. Conversions and moves can take two to three days.
When is the cheapest time to replace a boiler?
Spring and summer, when engineers are less busy. If your boiler is struggling, replacing it before winter avoids a rushed emergency job.
Sources
- Fantastic Services, boiler replacement cost guide (updated September 2026)
- Heatable, new boiler costs (updated April 2026)
- MyJobQuote, boiler installation costs (updated October 2026)