Underfloor Heating Electrical Cost: UK Price Guide 2026

Heating Element Costs (Trade Prices)

• Standard heating mat (150W/m²) — £30 to £45 per square metre trade. Pre-spaced cable on fibreglass mesh for quick installation in regularly shaped rooms. Available in standard sizes from 1 m² to 20 m². The most common choice for bathrooms, en-suites, and kitchens.
• High-output heating mat (200W/m²) — £40 to £55 per square metre trade. Higher wattage for rooms with greater heat loss, such as conservatories, ground-floor extensions over uninsulated concrete, and rooms with large glazed areas.
• Loose heating cable — £25 to £40 per square metre trade (cable only, plus £10 to £15 for fixing strips). More versatile for irregular room shapes and varying heat density. Requires more installation time but offers greater flexibility.
• Ultra-thin foil mat — £40 to £60 per square metre trade. Only 1.8mm thick, designed for installation under laminate and engineered wood without raising the floor level. Lower output (typically 140W/m²) but minimal floor build-up.

Thermostat Options

• Basic manual thermostat — £50 to £80. Simple dial or digital thermostat with floor sensor. Maintains a set temperature but no scheduling capability. Suitable for rooms used at irregular times.
• Programmable thermostat — £80 to £150. 7-day programming with multiple time/temperature zones per day. Floor and air temperature sensors. The standard choice for most installations — set the heating to come on before the room is used and switch off when not needed.
• Smart WiFi thermostat — £150 to £200. App-controlled with geofencing, learning algorithms, and integration with smart home systems (Alexa, Google Home). Offers the best energy efficiency through adaptive scheduling and remote control.

• Circuit sizing — size the circuit for the total heating load. A bathroom mat (4 m² at 150W/m² = 600W, 2.6A) needs a 6A or 10A circuit. A kitchen (12 m² at 150W/m² = 1,800W, 7.8A) needs a 10A or 16A circuit. A large living room (20 m² at 200W/m² = 4,000W, 17.4A) needs a 20A circuit.
• RCD protection — under BS 7671 Regulation 411.3.3, RCD protection with a rated residual operating current not exceeding 30 mA is required. An RCBO at the consumer unit provides both overcurrent and earth leakage protection for the dedicated UFH circuit.
• Cable and containment — 2.5mm² twin and earth for circuits up to 20A (typical). The cable runs from the consumer unit to a fused connection unit or the thermostat location. Cost for cable, containment, and back box: £50 to £150 depending on distance.
• New circuit cost — £150 to £300 for the dedicated circuit including the RCBO (£35 to £55), cable, containment, and connection. If the consumer unit has no spare ways, a board upgrade may be needed — see our consumer unit replacement cost guide.

• Insulation boards — £8 to £15 per square metre. Typically 6mm to 10mm thick XPS (extruded polystyrene) or similar rigid insulation. Tile backer boards with built-in insulation serve a dual purpose and cost £10 to £20 per square metre.
• Screed vs direct-to-tile — heating mats can be installed directly in tile adhesive (direct-to-tile method) for minimal floor build-up (3 to 5mm total). Alternatively, a self-levelling compound or screed (15 to 30mm) encapsulates the heating element and provides better heat distribution and thermal mass, but raises the floor level more. Screed costs £10 to £20 per square metre.
• Total floor build-up — direct-to-tile with insulation: 10 to 15mm. With screed and insulation: 25 to 45mm. Consider the impact on door clearances, step heights, and transitions to adjacent rooms. The floor build-up is a key factor in renovation projects.

Estimated Running Costs (2026 Electricity Rates)

• Bathroom (4 m² heated area, 150W/m²) — 600W load. Cost per hour at full output: approximately £0.17. With thermostat cycling (typically 30% to 50% duty cycle once warm): £0.05 to £0.09 per hour. Monthly cost (4 hours per day): £6 to £11.
• Kitchen (10 m² heated area, 150W/m²) — 1,500W load. Cost per hour at full output: approximately £0.42. With thermostat cycling: £0.13 to £0.21 per hour. Monthly cost (6 hours per day): £24 to £38.
• Living room (18 m² heated area, 200W/m²) — 3,600W load. Cost per hour at full output: approximately £1.01. With thermostat cycling: £0.30 to £0.50 per hour. Monthly cost (8 hours per day): £72 to £120.

• Bathroom (4 m² heated area) — £500 to £900 total. Heating mat: £120 to £180. Insulation: £35 to £60. Thermostat: £80 to £150. Dedicated circuit: £150 to £250. Labour: £150 to £300.
• Kitchen (10 m² heated area) — £1,100 to £1,800 total. Heating mat: £300 to £450. Insulation: £80 to £150. Thermostat: £80 to £150. Dedicated circuit: £150 to £300. Labour: £250 to £400. Self-levelling compound (optional): £100 to £200.
• Living room (18 m² heated area) — £1,800 to £3,000 total. Heating element (cable or mat): £540 to £1,080. Insulation: £145 to £270. Thermostat: £100 to £200. Dedicated circuit: £200 to £300. Labour: £350 to £500. Self-levelling compound: £180 to £360.
• Conservatory or extension (15 m² heated area) — £1,500 to £2,500 total. High-output mat (200W/m²): £600 to £825. Insulation: £120 to £225. Thermostat: £100 to £200. Dedicated circuit: £200 to £300. Labour: £300 to £450.