How much does central heating cost in the UK? (2026)
Verified UK central heating system costs in 2026 by property size, plus per-radiator pricing, power flush, magnetic filter, smart controls, and the scope gaps that catch homeowners out when getting a quote.
A new full central heating system in the UK in 2026 costs £3,000 for a 1-bed flat to £12,000+ for a 5-bed detached, with the typical 3-bed house landing at £4,000 to £7,000 (Checkatrade, MyJobQuote). For boiler-only replacement, see the new boiler cost guide.
Quick answer
UK central heating system cost in 2026 by property size: 1 to 2-bed flat £3,000 to £5,000, 3-bed house £4,000 to £7,000, 4-bed £5,500 to £9,000, 5-bed £7,000 to £12,000+. Per radiator installed: £250 to £700. Power flush: £400 to £700. Smart thermostat installed: £200 to £400. London and the South-East run 15 to 25% above national.
How to read this guide#
Two kinds of figures appear below:
- Headline price ranges (full system by property size, per-radiator cost, power flush, smart controls): cross-referenced against multiple UK cost-guide publishers.
- Practical guidance (what is included, the boiler-vs-system split, upgrades and extras, regional variation, red flags): drawn from standard UK heating installation practice.
Headline ranges (verified)#
Full system install by property size#
| Property | Range |
|---|---|
| 1 to 2-bed flat (4 to 6 radiators) | £3,000 – £5,000 |
| 3-bed house (7 to 10 radiators) | £4,000 – £7,000 |
| 4-bed house (10 to 13 radiators) | £5,500 – £9,000 |
| 5-bed or detached (13+ radiators) | £7,000 – £12,000+ |
These figures cover a complete system: boiler, radiators, pipework, controls, commissioning, and Gas Safe certification. The boiler itself is typically £1,500 to £2,500 of the total (see the new boiler cost guide for the per-type breakdown).
Component costs#
| Item | Range |
|---|---|
| Single radiator supplied and fitted | £250 – £700 |
| Designer or vertical radiator | £400 – £900 |
| Power flush (3-bed) | £400 – £700 |
| Magnetic system filter (MagnaClean) | £150 – £250 |
| Smart thermostat (Hive, Nest, tado) installed | £200 – £400 |
| Pump replacement | £200 – £400 |
| Expansion vessel replacement | £150 – £300 |
| Thermostatic radiator valves (TRVs), each | £40 – £80 |
| New zone valve (S-plan or Y-plan) | £100 – £250 |
Underfloor heating#
| Type | Range |
|---|---|
| Wet UFH retrofit, small room (5 to 8 m²) | £750 – £1,500 |
| Wet UFH retrofit, larger room (15 to 25 m²) | £2,000 – £4,000 |
| Electric UFH (per m²) | £50 – £80 |
Underfloor heating is more efficient at the lower flow temperatures heat pumps run at; see the heat pump cost guide for the system implications.
London and South-East uplift#
Central heating installs in London and the South-East run roughly 15 to 25% above these national figures. A £6,000 install nationally typically lands at £7,000 to £7,500 in inner London.
Practical guidance (industry standard)#
What a complete central heating quote should cover#
A typical UK central heating install quote should include:
- Survey of the property and a heat-loss calculation to size the boiler and radiators
- Boiler supply: make, model, kW output
- Radiator supply: type, size, BTU rating per room
- Pipework: copper, plastic push-fit (e.g. Hep20), or stainless steel, with the type named
- Thermostatic radiator valves on every radiator except the one in the same room as the room thermostat
- Programmer or smart thermostat
- Pump, expansion vessel, and zone valves (S-plan or Y-plan)
- Magnetic system filter to capture sludge
- System fill and chemical inhibitor
- Commissioning, balancing, and a full system test
- Gas Safe certification (CP12 if a landlord install, or the equivalent Building Regs compliance certificate)
- Removal and disposal of the old boiler and any redundant radiators
- 12-month workmanship guarantee, plus the boiler manufacturer's product warranty (typically 5 to 10 years)
It often does not cover:
- Making good plaster and flooring where pipework has been chased or floorboards lifted
- Redecoration after the install
- Power flush of the existing system if a partial upgrade rather than a full replacement is in scope
- A magnetic filter if the customer has not asked (often an upsell at install)
- A smart thermostat upgrade beyond a basic programmer
- Underfloor heating, even in a single room
- Building Control notification fees if the install triggers them
When you compare central heating quotes, the easy mistake is comparing a £6,500 quote inclusive of the magnetic filter, smart thermostat, and disposal against a £5,500 quote that excludes them. Read the inclusions list line by line.
Boiler vs system: where the lines are#
Two adjacent jobs cause confusion in quotes:
- Boiler swap: replacing only the heat source on an otherwise sound system. £2,000 to £4,500 typically. Covered in the new boiler cost guide.
- Central heating install: the whole system, including boiler, radiators, pipework, and controls. The bands above apply.
A "central heating install" quote that lands close to the boiler-swap band is probably a boiler swap with the existing radiators and pipework kept. That is fine if the existing components are sound; it is not a new system. Read the scope to know which job is being priced.
Boiler type drives a third of the cost#
The boiler is typically £1,500 to £2,500 of a full install. Type matters:
- Combi: most common in UK flats and smaller homes. Heats water on demand, no separate cylinder needed. £1,500 to £2,500 supplied.
- System: needs a hot water cylinder but no cold tank. Suited to larger homes with simultaneous hot water demand from multiple bathrooms. £1,800 to £3,000 supplied.
- Regular (conventional): needs both a hot water cylinder and a cold tank. Found in older properties. Often replaced with a combi or system during a full install if cylinder space allows.
The full new boiler guide covers brand premiums (Worcester, Vaillant, Viessmann, Ideal, Baxi) and per-type bands.
Pipework: copper, plastic, or stainless steel#
The pipework material is rarely on a quote but matters for longevity and resale:
- Copper: the traditional UK standard. Long-lived, neat soldered joints, fits any radiator. Slowest to install.
- Plastic push-fit (Hep20, Speedfit, John Guest): much faster to install, no soldering, used widely in newer installs. Long-term durability is good but joints under floors should be accessible for inspection. Some homeowners and surveyors prefer copper at the visible ends.
- Stainless steel: rare in domestic, used in commercial. Most installs do not see this.
A quote that does not name the pipework material is leaving room to substitute downwards. Ask.
Power flush vs filter#
When a new boiler is fitted to an existing system, the manufacturer warranty almost always requires either a power flush or a clean system demonstrated by a magnetic filter and chemical inhibitor:
- Power flush (£400 to £700): chemical clean of the whole system, forcing sludge out of radiators and pipework. Standard on systems more than 10 years old or showing cold spots.
- Magnetic filter (MagnaClean) (£150 to £250 supplied and fitted): catches new sludge as it forms. Required by most modern boiler warranties. A new install should always include one.
A quote for a boiler swap on an old system that includes neither is risking the manufacturer warranty.
Regional variation#
UK central heating prices vary by region, mainly on the labour side (boilers and radiators are nationally priced):
- Inner London: ~20 to 30% above national
- Outer London / M25: ~10 to 20% above
- South-East: ~5 to 15% above
- Midlands and East: close to national
- North of England, Wales: ~5 to 10% below
- Northern Ireland, rural Scotland: ~8 to 12% below
For a 3-bed install at £5,500 nationally, this means roughly £6,800 to £7,200 in inner London and £5,000 to £5,200 in the North.
Red flags in central heating quotes specifically#
Beyond standard quote red flags (covered separately), some are heating-specific:
No Gas Safe number on the quote. Illegal in the UK. The number is verifiable on the Gas Safe public register.
No heat-loss calculation referenced. Sizing the boiler to the kW rating of the old one is rule-of-thumb, not designed sizing. Most UK boilers are oversized, which short-cycles and shortens lifespan. A fair quote references the heat-loss calculation.
No magnetic filter or power flush named on a boiler going onto an existing system. Voids the manufacturer warranty.
Pipework material not named. Leaves room to substitute downwards.
No TRVs on radiators. TRVs are required on every radiator except the one in the room with the main thermostat, under Building Regs Part L.
No smart programmer or basic time clock. A new install must have a programmer or smart thermostat, also under Part L.
Boiler brand and model unnamed. "New combi boiler" with no make and model leaves room for a cheaper substitute. The quote should specify Worcester Bosch, Vaillant, Viessmann, Ideal, Baxi, or similar with a model number.
Suspiciously low quote. A full 3-bed install under £3,500 in 2026 is either skipping scope (no flush, no filter, no controls, partial radiator replacement) or being done by an unregistered engineer.
Sequence of work on a full install#
- Survey and quote. Engineer inspects the existing system, takes measurements, produces a fixed-price quote against an agreed scope.
- First fix. Floors lifted and walls chased where needed; new pipework run; old radiators removed.
- Boiler fit. Boiler positioned, gas and water connected, flue fitted.
- Second fix. New radiators hung and connected; valves fitted; thermostat and programmer wired.
- Filling and pressure test. System filled, pressurised, leaks identified and fixed.
- Power flush or filter clean. Cleaning agents circulated; filter fitted.
- Commissioning. Boiler started, system balanced, controls set, homeowner walk-through.
- Certification. Gas Safe building regs compliance certificate issued and registered.
Skipping any of stages 5, 6, or 8 is a serious shortcut. The most common version is a quote that lands at a competitive total because the install ends at stage 4.
Comparing your central heating quote#
The quote checker on this site analyses each line against current UK rates, flags missing scope (power flush, magnetic filter, TRVs, smart controls, Gas Safe certification), and runs a Companies House check on the installing company. For a £5,500 to £9,000 install, the £14 cost is small relative to the decision; the information returned is what turns "this quote looks roughly right" into "every line of this number checks out."
Got a quote you want checked?
Paste any UK contractor quote and Check the Quote compares every line item against current market rates, flags missing scope, and runs a Companies House check on the contractor. Free on your first project.
Frequently asked questions
- How much does a new central heating system cost in the UK in 2026?
- A new full system in a 3-bed house is £4,000 to £7,000 in 2026 (Checkatrade, MyJobQuote). Smaller 1 to 2-bed flats run £3,000 to £5,000. 4-bed houses run £5,500 to £9,000. 5-bed and larger detached homes run £7,000 to £12,000+. The figure includes the boiler, radiators, pipework, controls, and commissioning. London and the South-East run 15 to 25% above national.
- How much does a single new radiator cost installed?
- A standard new radiator costs £250 to £700 supplied and fitted, depending on size, style, and whether new pipework is needed. The radiator itself is £100 to £400; labour is £150 to £300 per radiator. Designer or vertical radiators run higher (£400 to £900 supplied). Adding a radiator to a circuit that does not currently reach it adds pipework labour (£200 to £600).
- What is a power flush and do I need one?
- A power flush is a chemical clean of an existing central heating system to remove sludge and limescale from radiators and pipework. It costs £400 to £700 for a typical 3-bed house in 2026. Most boiler manufacturers require a power flush (or equivalent system clean) as a condition of warranty when fitting a new boiler to an old system. A fair quote either includes it or names a magnetic system filter (MagnaClean) as an alternative for systems that are not heavily sludged.
- How long does a full central heating install take?
- A new system in a 3-bed house takes 5 to 7 days on site. A 1 or 2-bed flat is 3 to 5 days. A 4 or 5-bed detached is 7 to 10 days. The time scales with the number of radiators (each adds half a day for fitting and balancing), the pipework run (going through ceilings adds time), and whether walls or floors need lifting. A boiler-only swap is 1 to 2 days.
- What is normally left out of a central heating quote?
- Common gaps: making good plaster and flooring after pipework runs, redecoration after the install, removal and disposal of the old boiler and radiators (sometimes included, sometimes not), a magnetic system filter (worth £150 to £250 but often left for an upsell), a smart thermostat (£200 to £400), and Building Control or Gas Safe notification fees. The boiler service contract or 12-month workmanship guarantee should be named on the quote.
- Do I need Gas Safe registration on the quote?
- Yes. Any work on gas appliances must be carried out by a Gas Safe registered engineer in the UK. The registration number should be on the quote and verifiable on the Gas Safe public register. Non-Gas Safe work is illegal, voids your buildings insurance, and is dangerous. A quote without a Gas Safe number is incomplete.