How Much Does Underfloor Heating Cost in 2026? (UK)
Wet (water) underfloor heating in 2026 UK costs £45–£75/m² as a retrofit and £30–£55/m² in new build. Electric UFH (best for bathrooms and small rooms) runs £25–£45/m². A whole-house wet system in a typical 3-bed (90 m²) totals £4,500–£9,000 fitted. Pair it with a heat pump and UFH runs 25–40% cheaper than radiators on the same floor area.
2026 UFH cost breakdown by system type
Two systems dominate the UK market in 2026:
- Wet (water) UFH — pipework loops in screed or low-profile boards, fed by a manifold from a boiler or (ideally) a heat pump. Lowest running cost; best for whole-house and large open-plan areas.
- Electric UFH — thin heating mat or loose wire under tile/stone. Cheap to install, expensive to run continuously. Best for bathrooms, en-suites and small kitchens.
Wet UFH cost per m² (2026)
- New build / first-floor screed: £30–£55/m² supply & fit (including manifold share)
- Retrofit on existing concrete (overlay boards): £55–£75/m²
- Retrofit between joists (suspended floor): £45–£65/m²
- Manifold + controls (1-off): £600–£1,200
- Heat pump compatibility extra (low-profile/wider pipe centres): +£5–£10/m²
Electric UFH cost per m² (2026)
- Heating mat (under tile, even rectangle): £25–£35/m² supply & fit
- Loose wire (awkward shapes, around WC/basin): £35–£45/m²
- Thermostat (smart, Wi-Fi): £120–£220 per zone
- Typical small bathroom (4 m²): £250–£450 fitted (excluding tiling)
What a whole-house wet UFH install really costs in 2026
For a typical 3-bed semi (90 m² heated floor) the realistic 2026 budget is:
- Pipework + screed/overlay: £3,500–£6,500
- Manifold + actuators + zone valves: £900–£1,500
- Smart room thermostats (5 zones): £500–£900
- Heat pump tie-in (if installing with ASHP): £400–£800 extra plumbing
- Total fitted: £4,500–£9,000 (excludes the heat pump or boiler itself)
Running cost: UFH vs radiators in 2026
UFH runs at a lower flow temperature (35–45°C) than radiators (60–70°C), which makes it the natural partner for an air source heat pump. On a 2026 typical gas tariff (~7p/kWh) UFH saves about 8–15% vs radiators. On a heat pump it saves 25–40% because the COP rises sharply at lower flow temperatures.
When UFH is worth it
- You’re fitting a heat pump — UFH is the highest-COP emitter you can pair with one
- You’re building, extending or doing a full floor-up renovation
- You want open-plan kitchen-diner or living space with no radiators on the walls
- You have hard floors (tile, stone, engineered wood) which transmit UFH heat well
When UFH is NOT worth it
- You’re only replacing a boiler and keeping the existing radiator circuit — the install disruption isn’t worth the marginal saving
- You have thick carpet with deep underlay — insulates the heat away from the room
- You’re refurbishing one bedroom only — electric UFH might fit; wet retrofit usually won’t pay back
How to get a fair UFH quote in 2026
1. Specify wet or electric upfront
Quotes for the two systems aren’t comparable. Decide first.
2. Insist on a heat-loss calculation
A proper installer does a room-by-room heat-loss before quoting pipe centres and flow temperatures — especially for heat pump installs.
3. Confirm flooring compatibility
Engineered wood: TOG < 1.0. Carpet + underlay: combined TOG < 1.5. Get this in writing.
4. Compare three local installers
Use BestBuilders to match with three Gas Safe / MCS-certified UFH installers near you.
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