Underfloor Heating Cost UK 2026: Wet vs Electric by Room + Whole House
UK underfloor heating in 2026 costs £50-90/m² for electric (best for single rooms) and £80-150/m² for wet (water) systems (best whole-house). A typical bathroom electric system is £500-1,200; a whole-house wet system in a new build is £5,000-12,000. This guide uses verified Q2 2026 pricing from heating specialists across 519 UK towns — by system type, room, retrofit vs new-build + heat source.
UK Underfloor Heating Cost 2026: 30-Second Answer
UK underfloor heating (UFH) splits into two systems. Electric UFH (£50-90/m²) uses heating mats or loose wire under the floor finish — cheap to install, ideal for single rooms (bathroom, kitchen, conservatory) + retrofits, but more expensive to run. Wet (water) UFH (£80-150/m²) circulates warm water through pipes in the floor — more expensive to install but far cheaper to run, ideal for whole-house + new builds.
Typical costs: a bathroom electric system £500-1,200, a kitchen-diner electric £900-2,200, a whole-house wet system £5,000-12,000 in a new build (£8,000-18,000 retrofit with floor build-up). Wet UFH pairs perfectly with a heat pump (low flow temperature) — making it the standard for low-carbon new homes.
Bottom line: electric UFH for single-room retrofits + comfort heating; wet UFH for whole-house, new builds + heat-pump homes. Wet UFH costs more upfront but its low running cost + heat-pump compatibility win over the long term.
UK Underfloor Heating: Wet vs Electric Cost 2026
| System | Install Cost /m² | Running Cost | Best For |
|---|---|---|---|
| Electric — Heating Mat | £50-80/m² | Higher (electricity 27p/kWh) | Bathroom, kitchen, single-room retrofit |
| Electric — Loose Wire | £60-90/m² | Higher | Irregular-shaped rooms, awkward layouts |
| Wet — New Build Screed | £80-120/m² | Lower (esp. with heat pump) | Whole-house, new builds, extensions |
| Wet — Retrofit (low-profile) | £100-150/m² | Lower | Retrofit over existing floor, renovations |
Includes system + install + thermostat/controls. Wet systems also need a manifold (£300-600) + connection to boiler/heat pump. Electric needs a dedicated circuit (electrician). New floor finish (tile, engineered wood) is extra. London + South-East +15-25%.
UK Underfloor Heating Cost by Room 2026
| Project | System | Typical Cost 2026 |
|---|---|---|
| Bathroom (5-8 m²) | Electric mat | £500-1,200 |
| Kitchen-diner (15-25 m²) | Electric or wet | £900-3,000 |
| Extension (20-30 m²) | Wet (new screed) | £1,800-4,000 |
| Whole house (new build, 100 m²) | Wet screed | £5,000-12,000 |
| Whole house (retrofit, 100 m²) | Wet low-profile | £8,000-18,000 |
Wet UFH is the natural partner for an air-source heat pump — it runs efficiently at the low flow temperatures (35-45°C) heat pumps produce, unlike radiators which need higher temperatures. This is why most new-build + low-carbon homes use wet UFH throughout.
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UK Underfloor Heating Cost FAQ · 2026
UK underfloor heating Q2 2026: electric £50-90/m², wet (water) £80-150/m². By project: bathroom electric £500-1,200, kitchen-diner £900-3,000, extension wet £1,800-4,000, whole-house new-build wet £5,000-12,000, whole-house retrofit £8,000-18,000. Wet systems need a manifold (£300-600). London/SE +15-25%.
Electric (£50-90/m²) is cheaper to install + ideal for single-room retrofits (bathroom, kitchen) but more expensive to run on electricity. Wet/water (£80-150/m²) costs more to install but is far cheaper to run + ideal for whole-house + new builds. The rule: electric for one or two rooms + comfort heating; wet for whole-house heating + new builds. Wet also pairs perfectly with a heat pump, making it the standard for low-carbon homes.
Wet UFH connected to a heat pump is the cheapest to run — the heat pump delivers 3-4kW of heat per 1kW of electricity at the low flow temperatures UFH uses. Wet UFH on a gas boiler is comparable to radiators but more even. Electric UFH is the most expensive to run (direct electricity at 27p/kWh) so it's best used for occasional/comfort heating in single rooms rather than primary whole-house heating. A bathroom electric mat used briefly each day costs pennies; running electric UFH as a whole-house primary heat source is uneconomic.
Yes. Electric UFH is easy to retrofit — the thin mats/wire add only 3-5mm to the floor height under the finish. Wet UFH retrofit uses low-profile systems (15-25mm build-up) that fit over an existing floor without major excavation, costing £100-150/m² (vs £80-120/m² for new-build screed). Retrofit is most cost-effective when done alongside a floor replacement or renovation. The main constraint is floor height — every system raises the floor level, which affects doors + thresholds.
Yes — wet underfloor heating is the ideal partner for an air-source or ground-source heat pump. UFH operates at low flow temperatures (35-45°C) which is exactly where heat pumps are most efficient (delivering a high COP). Radiators need higher temperatures (50-65°C) where heat pumps work harder + less efficiently. This is why almost all new-build + retrofit heat-pump homes use wet UFH throughout — the combination delivers the lowest running cost + carbon of any UK heating system in 2026.
Where Our 2026 Underfloor Heating Data Comes From
- UFH Association Q2 2026 installer pricing
- CIPHE heating standards
- Building Regs Part L — heat emitter efficiency
- 519-town heating specialist quote dataset Q2 2026
- Wet vs electric + retrofit cost modelling
- Q2 2026 energy cap running-cost basis
All cost ranges reflect quotes from heating specialists in Q2 2026 across 519 UK towns. Editorial standards: /editorial-standards.