Updated 25 September 2026
Oil boiler replacement cost UK 2026
The going rate for oil boiler replacement in 2026 is £2,200–£5,500 (total, ex VAT). Below: a calculator, what the job involves, materials at three price levels, and the prep that changes the price.
Market band£2,200–£5,500
Worked example, 1 boiler£4,526
Time on site1 days
Oil boiler replacement calculator
Price a real job freeUses your rates, your speed and your receipts.
Market band source: MyJobQuote.
What the job involves
| Stage | Task | Typical time |
|---|---|---|
| out | Drain down and remove old boiler | 2 h |
| in | Fit oil boiler, flue and oil line | 8 h |
| in | Chemical cleanse, filter, inhibitor, commission | 2 h |
Materials at three price levels
| Material | Budget | Trade choice | Premium |
|---|---|---|---|
| Oil condensing boiler each | £2,000 Internal oil combi or system — Like-for-like | £2,600 Branded oil boiler — Proven, parts available | £3,300 External weatherproof oil boiler — Frees space inside |
| Magnetic filter and cleanser each | £90 Basic magnetic filter — Catches sludge | £130 Branded filter and cleanser — Protects the heat exchanger | £180 Dual-action filter — Best protection |
| Heating controls each | £40 Wired programmable stat — Meets Part L controls | £80 Wireless programmable stat — Place it anywhere | £180 Smart thermostat — App control |
| Valves, pipe, fittings and condensate allowance | £50 Standard fittings — Connects up | £80 Fittings plus frost-protected condensate — No frozen condensate | £120 Full copper tails and lagging — Tidy, efficient |
| Oil line, filter and fire valve set | £90 Filter and fire valve — Required safety kit | £150 Plus de-aerator — Cleaner fuel supply | £220 Plus tank gauge — Know when to order |
Trade prices ex VAT, estimates checked 2026-09-25. Log your receipts in Grafto and your own prices replace these.
What changes the price
- Controls? keep existing · new programmable stat · smart controls
Prep to look for
| Condition | Check | Effect |
|---|---|---|
| Sludge in the system | black water from a bleed valve, radiators cold at the bottom | Power flush the system |
| Boiler age from badge | data badge or model label on the boiler | Check the boiler age on the badge: over 12–15 years, replace rather than repair |
| Possible asbestos lagging | old grey or white pipe lagging | Possible asbestos lagging: stop and test before disturbing |
Questions
How much does oil boiler replacement cost in the UK in 2026?
The researched market band is £2,200–£5,500 (total, ex VAT), from MyJobQuote. A worked example of 1 boiler comes to about £3,506–£5,798 across budget, trade and premium materials.
How long does oil boiler replacement take?
The worked example of 1 boiler takes about 1 working days.
What changes the price of oil boiler replacement?
Mainly size and access, plus any prep found on site: sludge in the system, boiler age from badge, possible asbestos lagging.