Heating · Updated 2026
Central heating installation cost
Typical range£300–£12,000· Average first-time central heating system (3 bed)
Full central heating system costs for 2025 — first-time and replacement. In the UK, expect to pay between £300 and £12,000, with the typical project around £4,500 (average first-time central heating system (3 bed)). Regional variation, specification tier and site access conditions all shift the final quote.
Quick answer: Central heating installation cost in the UK typically costs between £300 and £12,000 (Average first-time central heating system (3 bed)). London and the South East run 20–35% above this range; the North, Wales and most of Scotland sit 5–15% below.
Homeowners researching this typically also price up boiler replacement cost. For wider context, browse our bathroom pricing, kitchen pricing and trades day rates.
Cost table
Indicative price ranges (UK, GBP)
| Item | Typical range (GBP) |
|---|---|
First-time install (1–2 bed flat) — Combi boiler, 5–8 radiators, pipework | £3,000–£5,000 |
First-time install (3 bed house) — Combi boiler, 10–12 radiators | £4,500–£7,500 |
First-time install (4 bed house) — System boiler, cylinder, 14+ radiators | £6,000–£10,000 |
System upgrade (new boiler + rads) — Replacing boiler and all radiators | £3,500–£8,000 |
Power flush (existing system) — Cleaning existing pipework and radiators | £300–£800 |
Labour costs
Labour typically accounts for 55% of the total project cost in the UK.
Labour line items
| Item | Typical range (GBP) |
|---|---|
Gas Safe engineer | £250–£400/day |
Pipework (per metre) | £15–£30/m |
Radiator installation (each) | £0–£0 |
Boiler installation | £600–£1,200 |
Gas supply connection | £300–£900 |
Materials costs
Materials and fittings make up the remainder of the budget, with specification tier driving most of the variation.
Materials & fittings
| Item | Typical range (GBP) |
|---|---|
Combi boiler | £800–£2,000 |
Radiators (per unit) | £0–£0 |
TRVs (thermostatic valves) | £0–£0 |
Copper pipework (per m) | £5–£12/m |
Smart thermostat | £80–£250 |
Magnetic filter | £60–£120 |
Factors affecting cost in the UK
- ·Region — London and the South East run 15–30% above national averages.
- ·Specification tier — premium materials and finishes can double the base cost.
- ·Access and site conditions — flats, restricted parking and listed buildings add time.
- ·Scope changes mid-project — late design decisions are the biggest cost overrun driver.
- ·Trade availability — quotes rise 10–20% in peak spring and summer months.
Ways to reduce cost
- ·Re-use existing radiators and pipework where layout allows.
- ·Choose a system rather than a regular boiler to skip the hot water cylinder.
- ·Specify TRVs and a smart thermostat from day one to avoid retrofit costs.
- ·Phase the install during a planned floor or kitchen refit to share lift/relay labour.
- ·Get quotes from at least three Gas Safe engineers — large national brands rarely win on price.
Frequently asked questions
- How long does it take to install central heating?
- Installing central heating for the first time in a 3-bedroom house typically takes 5–8 days. Replacing an existing system (boiler + radiators) takes 3–5 days. Power flushing alone takes 1 day.
- Can I get a grant for central heating?
- Yes — the Boiler Upgrade Scheme (BUS) provides £7,500 towards a heat pump. The Great British Insulation Scheme and ECO4 scheme may fund central heating for low-income households. Check eligibility at gov.uk.
- What size boiler do I need?
- A 24–28kW combi is sufficient for most 3-bed homes. Larger homes with multiple bathrooms need 30–35kW. An oversized boiler is inefficient — always get a heat loss calculation done by a Gas Safe engineer.