How to Price a Central Heating Installation: Pipework, Rads and Labour Guide

Quick Answer: A full UK central heating installation in 2026 prices £4,500–£8,500 for a typical 2–3 bed home (boiler + 6–8 radiators + pipework + controls), £7,500–£14,000 for a 4-bed home (10–12 radiators), and £12,000–£25,000+ for larger or premium installations with zone valves, designer radiators, smart controls and complex pipework runs. Per-radiator unit cost (boiler-to-radiator pipework + radiator + valves + commissioning) is typically £450–£900 fitted depending on access. Programme is typically 5–10 working days with the property without heating for 2–4 of those days.

Summary

Central heating installation pricing is built up from the boiler (£900–£2,800 supply), the radiators (£60–£280 supply per radiator), the pipework (£8–£18 per linear metre fitted in 15 mm copper or PEX), the controls (£80–£480 depending on complexity), and the labour (£320–£480 per engineer day). For a typical 2–3 bed home installation requiring 7 radiators, 60 m of pipework, modulating thermostat and zone valves, the build-up totals £4,500–£8,500.

The single biggest cost variable is access for pipework. A property where pipework can be run in floor voids (suspended timber floors common in older UK homes) is straightforward and labour-efficient. A property with concrete ground floors and limited routing (typical 1960s+ housing) requires either floor lifting or surface-clipped pipework — both add 25–40% to labour. The first quote question after boiler choice is "where will the pipework run?".

The Boiler Plus regulations (April 2018) and TR/19 weighting toward heat pump readiness mean modern installations are designed for lower flow temperatures (40–55°C rather than 70–80°C historic). Larger radiators are needed for the same heat output. New installations with appropriate radiator sizing and load compensation achieve gas savings of 10–20% versus older systems — an honest installer should include this design step in their quote.

Key Facts

Quick Reference Table

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Installation type Radiators Total fitted (2026) Programme
1-bed flat new install 3–4 £3,200–£5,500 4–6 days
2-bed terrace replacement 5–6 £4,200–£7,200 5–7 days
3-bed semi replacement 7–8 £5,500–£9,500 6–9 days
4-bed detached 8–10 £7,500–£12,500 7–11 days
5+ bed / large home 10–14 £10,000–£18,000 10–15 days
Listed building / heritage varies +25–40% varies
Heat-pump-ready (low temp design) varies +£600–£1,500 varies
Single radiator addition 1 £450–£900 1 day
Replace 3–4 radiators only 3–4 £900–£1,800 1–2 days

Detailed Guidance

Heat Loss Calculation — The Step Most Often Skipped

A correct central heating design starts with a room-by-room heat loss calculation per BS EN 12831. Inputs:

The calculation produces a target heat output per room (in W or kW). Radiator sizing then matches output to demand at the system flow temperature. For a heat-pump-ready design (45°C flow), radiators must be 50–80% larger than 70°C-design radiators for the same heat output.

Many installers skip this step and use rule-of-thumb sizing ("Type 22, 600×1000 in main rooms"). Rule-of-thumb works adequately for traditional 70°C boilers but fails for low-temperature design — a quote without a heat loss calculation is appropriate only for like-for-like replacement, not new design.

A proper heat loss calculation takes 1–3 hours and adds £80–£200 to job cost. It pays back in correct sizing — oversized radiators waste capital cost; undersized radiators leave rooms cold.

Pipework Material Decision

Three pipework systems dominate UK domestic central heating:

Copper (BS EN 1057) — soldered, compression or push-fit jointed. Long lifespan (50+ years documented), high pressure tolerance, fire-resistant. £4.50–£10 per linear m supply. Labour-intensive (soldering, careful jointing). Most premium specifications use copper throughout.

PEX-Al-PEX (multi-layer composite) — typical brands Hep₂O, Pegler, Polypipe. Plastic-aluminium-plastic sandwich pipe with push-fit fittings. £3.50–£6 per linear m supply. Fast labour (push-fit). Good thermal stability. Most modern domestic installations use this for buried pipework.

Plastic PEX — flexible plastic pipe with push-fit or crimp fittings. £2.50–£4.50 per linear m supply. Fastest labour. Good for hidden runs through floor voids and ceilings. Some controversy over long-term oxygen permeation; better PEX brands include oxygen barrier layer.

Most UK installations use a mix:

The pipework decision is approximately 30% of total installation labour cost. PEX-Al-PEX hidden runs reduce labour by 15–25% versus all-copper installations.

Radiator Selection

Radiator types in 2026 UK market:

Type 11 (single panel, single fin) — basic single-radiator construction. Lower output for given face area; cheaper. £40–£80 supply.

Type 21 (double panel, single fin) — double-skinned with one fin row. Mid-output. £60–£120 supply.

Type 22 (double panel, double fin) — most common UK domestic radiator. £80–£160 supply. Standard for kitchen, living, dining.

Type 33 (triple panel, triple fin) — high output for limited wall area. £120–£260 supply. Used in colder rooms or limited space.

Designer / vertical / column — various aesthetic options. £180–£600+ supply.

Towel rails (chrome, anthracite) — bathroom dual-purpose. £80–£280 supply.

The output of a Type 22 600×1000 mm radiator at Δ50K (70°C system) is approximately 1,500 W. At Δ30K (45°C low-temperature system), the same radiator produces approximately 700 W — less than half.

For pricing, the radiator cost varies dramatically by type and size:

Controls — From Basic to Smart

Heating control options:

Basic on/off thermostat + 7-day programmer — £80–£140 supplied and fitted. Compliant minimum.

Modulating thermostat — communicates with boiler to adjust output. £140–£220 supplied and fitted. Better part-load efficiency.

Smart thermostat (Hive, Nest, Tado, Honeywell Evohome) — internet-connected, learning, remote control. £180–£420 supplied and fitted.

Multi-zone Evohome or similar — different zones controlled independently with TRVs. £350–£800 for full multi-zone setup.

Weather compensation — outdoor temperature sensor that varies flow temperature. £140–£280 supplied and fitted.

TRVs (thermostatic radiator valves) — Boiler Plus mandates these on all radiators except the room with the wall-thermostat. £15–£40 per radiator supplied. Smart TRVs (Tado, Drayton Wiser) £80–£180 each.

The Boiler Plus compliance minimum is one of: smart thermostat, weather compensation, load compensation, or flue gas heat recovery. Most installations choose smart thermostat.

Power Flush and System Treatment

BS 7593 requires the heating system to be flushed before installation of new components. Two flush methods:

System flush during installation — when fitting all new pipework and radiators, flushing is straightforward — fill with chemical, run for 24 hours, drain, refill with inhibitor. Cost included in installation programme.

Existing system flush during partial replacement — when retaining some existing pipework or radiators, full power flush before installation is required. £450–£850 separate.

Magnaclean filter installation — typically included on new installations. £180–£350 supplied and fitted.

Inhibitor charge — Sentinel X100 or similar, dosed to manufacturer concentration. £25–£50.

Labour Programme

Typical 7-radiator installation programme:

For larger installations, programme extends linearly. Two-engineer crews shorten programme by 30–40%.

The property is typically without heating for 3–4 of the working days. Hot water depends on system type — a combi swap loses HW for the boiler-to-pipe day; a system or heat-only swap loses HW for the cylinder-disconnection day.

Frequently Asked Questions

Why does central heating cost £6,000+ for what looks like a few radiators?

Per-radiator economics: each radiator requires 8–15 m of pipework, two valves, a flow connection, a return connection, a pressure test, a flush, commissioning. The £450–£900 per-radiator unit cost reflects boiler-to-radiator end-to-end work, not just the radiator itself. For 7 radiators that's £3,150–£6,300 in radiator-related work alone, plus £1,500–£3,000 in boiler and central distribution.

Can I do central heating on a budget?

Yes — by retaining existing pipework where sound, choosing standard Type 22 radiators (not designer), using PEX-Al-PEX rather than copper for hidden runs, and using basic programmer + thermostat (not smart). Budget installations 2026 start around £4,200 for a small 2-bed property; below £4,000 implies either substandard work or unfair labour pricing.

Does a heat pump need different pipework?

Yes — heat pump systems run at 45–55°C flow temperature (vs 70–80°C for traditional boilers), which means radiators must be 50–80% larger for the same room output. This often means upgrading radiators when transitioning from gas to heat pump. Pipework can usually be re-used. Heat pump-ready installations spec the larger radiators initially, even with a gas boiler, so future heat pump conversion is straightforward.

Why has central heating got more expensive?

UK gas boiler installations were £3,500–£5,500 in 2020. 2026 prices are 25–35% higher driven by: ErP-A boiler unit cost increase, copper pipe price increase (raw material), labour rate increase (~25% over the period), and increased compliance scope (Boiler Plus, BS 7593 flush, magnetic filter).

What's the warranty on a full installation?

Boiler manufacturer warranty (typically 7–10 years for accredited installers) covers boiler failure. Installer's workmanship warranty (typically 2–6 years) covers pipework, radiators, and labour quality. Some installers offer extended workmanship warranties via insurance-backed schemes (e.g. CIGA, GPI) for additional fee.

Regulations & Standards