Underfloor Heating Cost: UK Installation & Running Costs

Installation costs: electric vs wet UFH

Electric underfloor heating

Material costs:

• Heating mat (150W/m²): £40–75 per m²
• Loose-wire system: £30–60 per m²
• Insulation board: £8–15 per m²
• Thermostat: £80–250
• Self-levelling compound (if needed): £6–12 per m²

Labour: £30–50 per m² for electrician to install and certify.

Total per m² installed: £75–120

A 5m² bathroom costs £375–600. A 10m² kitchen costs £750–1,200.

Wet (water-based) underfloor heating

Material costs:

• PE-X pipe (16mm): £8–15 per m² of floor
• Insulation boards: £12–20 per m²
• Manifold (controls zones): £200–500
• Pump and mixing valve: £300–800
• Screed or dry board system: £15–35 per m²
• Thermostats (per zone): £80–200 each

Labour: £40–70 per m² (plumber + screed layer or carpenter for dry system).

Total per m² installed: £80–150 plus £800–1,500 fixed costs

A 40m² ground floor (kitchen/dining/lounge open-plan) costs £4,000–7,500. The fixed costs (manifold, pump) make wet UFH uneconomical for single small rooms.

Running costs: electric vs wet UFH

Running cost depends on:

• Energy source (electricity, gas, or heat pump)
• Room size and insulation
• Floor covering (tile conducts heat better than carpet)
• Usage pattern (continuous vs zone heating)

Electric UFH running cost

UK average electricity: 28p per kWh (2026).

Electric UFH draws 150W per m². A 10m² bathroom draws 1.5kW.

Cost per hour: 1.5kW × £0.28 = £0.42

Thermostat cycles on/off, so actual runtime is ~50% of programmed time. If you run the bathroom heating 3 hours per day:

• Runtime per day: 1.5 hours (50% duty cycle)
• Cost per day: £0.63
• Annual cost: £230

A 40m² kitchen/diner running 8 hours daily costs £840–1,250 per year on electric.

Wet UFH running cost (gas boiler)

UK average gas: 7p per kWh (2026).

Gas boiler efficiency: 90% (condensing boiler).

Effective cost: 7p ÷ 0.9 = 7.8p per kWh of heat delivered.

Same 10m² bathroom:

• Heat demand: 1.5kW
• Cost per hour: 1.5kW × £0.078 = £0.12
• Annual cost (3 hours daily, 50% duty cycle): £66

A 40m² kitchen/diner costs £220–330 per year on gas-fired wet UFH.

Wet UFH running cost (heat pump)

Heat pump COP (coefficient of performance): 3.5 (typical for UFH-compatible systems).

For every 1kWh of electricity used, heat pump delivers 3.5kWh of heat.

Effective cost: 28p ÷ 3.5 = 8p per kWh of heat delivered.

Same 10m² bathroom:

• Cost per hour: 1.5kW × £0.08 = £0.12
• Annual cost: £66

40m² kitchen/diner: £220–330 per year (similar to gas, but no carbon emissions).

Electric UFH wins on installation cost for single rooms, but loses long-term on running costs. Over 15 years, wet UFH saves £1,350–2,850 in energy costs for that bathroom.

Whole-house underfloor heating cost

For new builds or major renovations covering 80–120m²:

Wet UFH system (gas or heat pump):

• Pipework + screed: £80–120 per m²
• Manifold + pump + controls: £1,200–2,000
• Total for 100m²: £9,200–14,000

Annual running cost (gas): £550–850. Annual running cost (heat pump): £550–850.

Electric UFH is not recommended for whole-house heating. Installation cost would be £7,500–12,000 (cheaper than wet), but annual running cost would be £2,200–3,500 (4× higher than gas/heat pump).

Retrofit costs (adding UFH to existing house)

Retrofitting wet UFH is expensive because you need to lift floors or raise floor height.

Options:

1. Screed over existing floor

Raise floor level by 50–80mm. Lay insulation, pipes, then screed. Causes door clearance issues. Costs £120–180 per m² including raising door frames and skirting.

2. Low-profile dry system

Grooved boards (18mm height) clip over existing floor, pipes slot into grooves. No screed needed. Raises floor by only 18–25mm. Costs £140–220 per m².

3. Between joists (suspended timber floors)

Lift floorboards, fit insulation and pipes between joists, replace boards. No floor height increase. Messy and disruptive. Costs £100–160 per m² plus board replacement.

Electric UFH retrofits easily: no floor lift needed if you're already replacing floor finish (tile bathroom, new kitchen floor). Costs £75–120 per m².

Cost by room type UK

Typical costs for common installations:

• Bathroom (5m²): Electric £375–600, Wet £1,600–2,800
• Kitchen (12m²): Electric £900–1,440, Wet £2,200–3,800
• Conservatory (15m²): Electric £1,125–1,800, Wet £2,600–4,200
• Open-plan living (40m²): Electric £3,000–4,800, Wet £4,400–7,500
• Whole ground floor (80m²): Electric £6,000–9,600, Wet £7,600–13,500

Hidden costs to budget for

Installation quotes often exclude:

• Subfloor prep: Levelling compound, DPM, insulation (£15–30 per m²)
• Floor finish: Tile, laminate or engineered wood on top of UFH (£20–80 per m²)
• Electrical work: New circuit for electric UFH or pump (£150–400)
• Building Control fees: Part P notification for electric UFH (£150–300 if DIY)
• Door trimming: If floor height increases (£50–80 per door)

Running cost reduction tips

To minimize running costs:

• Use programmable thermostats (heat only when needed, saves 15–25%)
• Zone the system (don't heat bedrooms during day, saves 20–30%)
• Insulate well under the UFH (6–10mm XPS foam minimum)
• Use lower flow temperatures (35–45°C wet UFH is more efficient than 55°C)
• Choose tile over carpet (better heat transfer = lower running time)
• Pair wet UFH with heat pump for lowest carbon + cost

Payback period: electric vs wet UFH

Example: 10m² bathroom, 3 hours daily use.

Electric UFH:

• Install: £900
• Annual running cost: £230

Wet UFH:

• Install: £2,200
• Annual running cost: £66
• Savings vs electric: £164 per year

Payback: (£2,200 - £900) ÷ £164 = 7.9 years.

After 8 years, wet UFH becomes cheaper. If you're staying in the house 10+ years, wet UFH pays for itself. If you're moving within 5 years, electric UFH is cheaper overall.