Underfloor heating has moved well beyond a luxury add-on. More UK homeowners are choosing it as a primary or supplementary heat source, particularly during renovations, extensions and new builds. Prices vary enormously depending on whether you go electric or water-based, the size of the room and who does the installation.
This guide breaks down the real 2026 costs for both system types, room by room, with honest figures for materials, labour and ongoing running costs so you can budget without surprises.
Electric underfloor heating for a single room typically costs £300 to £800 supply and installed. A wet (hydronic) system for a whole house ranges from £4,000 to £12,000 or more depending on floor area, heat source and floor build-up. Running costs for electric systems average £0.08 to £0.25 per hour per square metre; wet systems cost less to run per square metre but more to install.
Electric vs Wet Underfloor Heating: Which Costs More?
There are two fundamentally different types of underfloor heating in the UK market. Electric systems use heating cables or mats laid under the floor finish. Wet systems (also called hydronic or water-based) pump warm water through pipes embedded in the floor screed or in a low-profile overlay board.
- Electric systems: Lower upfront cost, quicker to install, ideal for single rooms or retrofits. Higher running costs per unit of heat than wet systems.
- Wet systems: Higher upfront cost, more disruptive to install, but cheaper to run long-term especially when paired with a heat pump or combi boiler. Better suited to whole-house projects or new builds.
For most homeowners retrofitting a bathroom or kitchen, electric is the practical choice. For anyone building an extension or doing a full house renovation, wet underfloor heating is worth the extra investment if you plan to stay long-term.
Electric Underfloor Heating Costs by Room Size
Electric heating mats and loose cable systems are sold per square metre. Labour costs depend on how accessible the subfloor is and whether the electrician needs to add a new circuit or fused spur.
| Room / Area | Supply and Install Cost |
|---|---|
| Small bathroom (4 to 6 sq m) | £300 to £600 |
| Medium bathroom (6 to 10 sq m) | £450 to £800 |
| Kitchen (10 to 15 sq m) | £600 to £1,100 |
| Living room (15 to 25 sq m) | £900 to £1,600 |
| Master bedroom (12 to 18 sq m) | £700 to £1,200 |
| Whole flat (50 to 70 sq m) | £3,000 to £5,500 |
Material costs for electric mats typically run from £20 to £50 per square metre. Labour for a qualified electrician adds £150 to £400 per room depending on complexity. Thermostat supply and fitting adds another £80 to £200 per zone.
Wet Underfloor Heating Costs by Property Size
Wet systems require a plumber or specialist installer and often a screed contractor. Costs increase significantly with floor area and system complexity. Prices below cover supply and full installation including manifolds, pump, pipework and screed in a standard new-build or extension scenario.
| Property Size | Estimated Total Cost |
|---|---|
| Single room extension (15 to 20 sq m) | £1,200 to £2,500 |
| Two-bedroom flat (55 to 70 sq m) | £4,000 to £7,000 |
| Three-bedroom house (85 to 110 sq m) | £6,000 to £10,000 |
| Four-bedroom house (120 to 160 sq m) | £8,500 to £14,000 |
| Large detached (180 sq m or more) | £12,000 to £20,000 |
These figures assume standard screeded floors. Retrofit overlay systems (which add less floor height) cost more per square metre in materials but can reduce labour time. Expect to add £500 to £1,500 per zone for manifold and controls when zoning a large property.
What Affects the Final Price?
Several factors push costs up or down significantly. Understanding them helps you get more accurate quotes.
- Floor type: Solid concrete subfloors are easiest for wet systems. Timber suspended floors can take pipework but need joisting or a specialist panel system, adding £10 to £25 per square metre to materials.
- Floor finish: Tile and stone conduct heat best. Engineered wood works well. Thick carpet or solid hardwood above 18mm can restrict heat transfer and may void warranties.
- Screed depth: Traditional sand and cement screed at 65mm to 75mm depth costs £25 to £45 per square metre. Fast-drying liquid anhydrite screed costs £30 to £55 per square metre but allows earlier occupation.
- Heat source: Wet UFH paired with an air source heat pump runs at lower flow temperatures (35 to 45 degrees C) which suits the system perfectly. Pairing with a standard combi boiler works but reduces efficiency gains.
- Number of zones: Each zone needs its own thermostat and manifold branch. Every additional zone adds £150 to £350 to the overall controls cost.
- Access and disruption: Retrofit projects in occupied homes cost more due to lifting existing floors, protecting other areas and phased working.
Running Costs: Electric vs Wet Systems
Running costs depend heavily on your electricity or gas tariff, floor insulation quality and how many hours a day the system operates. Figures below assume average 2026 UK electricity tariffs of around 24p per kWh and gas at around 6.5p per kWh.
- Electric mat (bathroom, 5 sq m, 150W/sq m): Approximately £0.18 per hour at full load. Running two hours a day costs around £130 per year for that room.
- Electric cable (living room, 20 sq m, 150W/sq m): Approximately £0.72 per hour at full load. With a smart thermostat and three hours daily use, expect £250 to £400 per year for that room.
- Wet system (whole house, gas boiler): Running costs vary widely but a well-insulated 100 sq m home might see £400 to £700 per year added to gas bills for the UFH contribution.
- Wet system (air source heat pump): With a COP of 3.0 to 3.5, the same house could cost £300 to £550 per year in electricity for UFH, lower than a gas boiler in running cost terms.
Insulating below the heating pipes or cables is critical. A 25mm insulation board under electric mats, or 50 to 100mm under wet pipes, can reduce heat loss to the subfloor by 30 to 50 percent. Never skip this step to save money upfront.
Thermostat and Smart Controls Costs
A basic programmable thermostat for a single electric zone costs £40 to £90 supply only. Smart thermostats with app control and scheduling cost £100 to £250 per zone. For wet systems with multiple zones, a wired multi-zone controller can add £300 to £800 for the controls package.
- Basic single-zone thermostat: £40 to £90 supply, £60 to £120 supply and fit.
- Smart Wi-Fi thermostat (single zone): £100 to £220 supply, £160 to £300 supply and fit.
- Multi-zone wet system controller (4 to 8 zones): £300 to £800 supply and fit.
- Hive, Nest or Tado compatible UFH thermostat: £150 to £280 per zone supply and fit.
Labour Rates for Underfloor Heating Installers
In 2026, electricians charge £45 to £75 per hour for electric UFH work. Plumbers and specialist UFH installers charge £50 to £85 per hour. In London and the South East, add 20 to 30 percent to all labour figures. Most single room electric installs take four to eight hours. A whole house wet system can take five to ten days for a team of two.
Grants and Incentives
Underfloor heating itself does not attract a specific government grant in 2026. However, if you are installing wet UFH as part of a heat pump installation, the Boiler Upgrade Scheme (BUS) offers £7,500 towards an air source heat pump. Since UFH works particularly well with heat pumps, the combined project often makes strong financial sense. Check the current BUS eligibility rules with an MCS-certified installer before committing.
Electric underfloor heating for a bathroom or kitchen costs £300 to £1,100 supply and installed and is the most practical retrofit choice. A wet system for a whole house runs from £4,000 to £14,000 depending on size and specification. Running costs for electric systems are higher per hour but manageable in small areas; wet systems paired with a heat pump offer the lowest long-term running costs. Always include underfloor insulation and a quality thermostat in your budget as both have a direct impact on efficiency and comfort.