Underfloor Heating Cost UK 2026: Wet vs Electric, By Room & Whole House
How much does underfloor heating cost in 2026? Electric underfloor heating costs £60–£120/m² supplied and fitted; wet (water) underfloor heating costs £90–£190/m². A small bathroom runs £400–£1,200, a kitchen-diner £1,500–£3,500, and whole-house wet UFH in a new build £6,000–£13,000. This guide uses verified Q3 2026 installer pricing to show realistic costs by room and project, real running costs at the April 2026 price cap, and why wet UFH is the perfect partner for a heat pump.
Underfloor Heating Cost UK 2026: Quick Answer
In 2026, electric underfloor heating costs £60–£120/m² supplied and installed, and wet (water) underfloor heating costs £90–£190/m². Electric is cheaper per room and ideal for a single bathroom (£400–£1,200) or en-suite; wet is cheaper to run and the right choice for a kitchen-diner (£1,500–£3,500), an extension or a whole house. A whole-house wet system costs £6,000–£13,000 in a new build but £12,000–£22,000 retrofitted into an existing two-storey home. Running costs strongly favour wet systems: a 15m² room costs around £180–£250 a year on a wet system versus £900–£1,200 on electric. Wet underfloor heating is also the perfect match for an air source heat pump, running at a low 35–45°C flow temperature where the heat pump is most efficient. London and the South East add roughly 15–25%.
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Wet vs Electric Underfloor Heating Cost Per m² (UK 2026)
There are two families of underfloor heating, and they price very differently. Electric (dry) systems use a heated cable, mat or mesh under your floor finish, run off your mains electricity and are cheap to fit but expensive to run. Wet (water) systems circulate warm water through pipes embedded in or above the floor, connected to your boiler or heat pump — they cost more to install but are far cheaper to run and can heat a whole house. The table below shows verified Q3 2026 supplied-and-fitted rates for the main system types.
| System Type | Cost Per m² (fitted) | Build-Up Height | Best For |
|---|---|---|---|
| Electric heating mat / mesh | £60 – £100/m² | 3–4mm + adhesive | Square/regular rooms, tile, retrofit |
| Electric loose wire / cable | £70 – £120/m² | 5–6mm + adhesive | Awkward shapes, around fixtures |
| Wet — new-build screed | £60 – £110/m² | 65–100mm screed | New builds, extensions, slabs |
| Wet — retrofit low-profile/overlay | £120 – £190/m² | 15–20mm overlay | Existing floors, limited height |
| Wet — suspended timber floor | £90 – £150/m² | Between/over joists | Period homes, upper floors |
Rates are supplied and installed including insulation, controls and connection, excluding the floor finish itself. Wet-system rates exclude the manifold, heat source and screed labour, which are priced separately below. Materials-only kits are cheaper but exclude fitting: a 4.5m² electric loose-wire kit starts around £290.
Electric Underfloor Heating: Mat, Mesh and Loose Wire Explained
Electric underfloor heating is the budget-friendly, quick-fit option, almost always chosen for individual rooms. Heating mats and mesh come pre-spaced on a self-adhesive backing and roll straight out across a regular floor, fixed under tile adhesive in an afternoon — the cheapest and most common format at £60–£100/m². Loose wire (loose cable) systems let you set your own spacing, so they snake neatly around toilets, basins and kitchen islands; they cost a little more (£70–£120/m²) but waste no coverage in odd-shaped rooms. For a room used as the only heat source rather than just toe-warming comfort, specify a higher 150–200W/m² output mat. Electric systems must be connected by a Part P registered electrician.
Wet (Water) Underfloor Heating: Screed, Overlay and Suspended Floor
Wet underfloor heating is the long-term, whole-house option. In a new build or extension, pipe is clipped to insulation and buried in 65–100mm of screed for £60–£110/m² — the cheapest wet route because there is no floor to lift. Retrofitting into an existing home uses low-profile overlay panels that raise the floor by only 15–20mm and cost £120–£190/m², or pipes routed between the joists of a suspended timber floor for £90–£150/m². Wet systems also need a manifold, blending valve and connection to a heat source, covered in the controls section below.
Underfloor Heating Cost by Room & Project (UK 2026)
The single biggest driver of your total cost is the floor area and whether you choose electric or wet. Small rooms almost always go electric; large open spaces and whole homes go wet. The table below gives realistic fully-fitted 2026 prices for the most common projects.
| Project | Typical Area | Usual System | Installed Cost 2026 |
|---|---|---|---|
| En-suite / small bathroom | 3–5 m² | Electric mat | £400 – £1,200 |
| Family bathroom | 6–9 m² | Electric mat | £700 – £1,600 |
| Kitchen | 10–15 m² | Electric or wet | £900 – £2,400 |
| Open-plan kitchen-diner | 20–30 m² | Wet (best value) | £1,500 – £3,500 |
| Single-storey extension | 20–40 m² | Wet screed | £1,800 – £4,500 |
| Conservatory / garden room | 12–25 m² | Wet or electric | £1,200 – £3,200 |
| Whole house — new build | 100–150 m² | Wet screed (multi-zone) | £6,000 – £13,000 |
| Whole house — retrofit | 100–150 m² | Wet low-profile + screed | £12,000 – £22,000 |
Whole-house retrofit is the most expensive route because every floor must be lifted, insulated, levelled and reinstated, and doors and skirtings often need adjusting. Prices include controls and connection but exclude the floor finish and, for wet systems, the heat source. London and the South East typically add 15–25%.
Bathroom Underfloor Heating Cost
The bathroom is where most people add underfloor heating first, and electric is nearly always the answer. A 4m² mat-based system costs £400–£1,200 supplied and fitted, including a thermostat and the Part P connection — the wide range reflects whether you also lay insulation boards (which roughly halve running cost) and the floor finish. Because it warms cold morning tiles in 20–45 minutes and is run only for short bursts, electric makes financial sense here despite the higher unit cost of electricity.
Kitchen-Diner & Extension Underfloor Heating Cost
Once you reach an open-plan kitchen-diner or an extension of 20m²-plus, wet underfloor heating becomes the better value choice. A 25m² kitchen-diner runs £1,500–£3,500 fitted as a wet system, and because the heating is invisible you free up wall space for units and glazing. New extensions are the ideal moment to fit wet UFH: the floor is already open, pipe goes straight into fresh screed at £60–£110/m², and you can put the new room on its own thermostatic zone.
Whole-House Underfloor Heating Cost
For a complete home, wet UFH on the ground floor (and sometimes upstairs) is the gold standard, especially alongside a heat pump. In a new build it costs £6,000–£13,000 for a 100–150m² home — roughly £60–£110/m². Retrofitting the same home costs £12,000–£22,000 because of floor lifting and reinstatement, so most retrofits do the ground floor in wet and add electric mats upstairs only where needed (bathrooms). Always insulate beneath the pipes to meet Part L and keep running costs down.
Underfloor Heating Running Costs: Wet vs Electric vs Radiators (UK 2026)
Installation is only half the story — running cost is where wet and electric diverge dramatically. The figures below use the Ofgem April 2026 price cap: 24.7p/kWh for electricity and 5.7p/kWh for gas. The headline: electricity costs over four times as much per unit as gas, so a wet system fed by a gas boiler or heat pump is far cheaper to run than electric, even though electric is cheaper to install.
| Heat Source | Running Cost Per Hour | 15m² Room — Annual | Why |
|---|---|---|---|
| Electric mat (mains) | £0.23 – £0.31/hr | £900 – £1,200 | Mains electricity at ~25p/kWh; 150–200W/m² |
| Wet — gas boiler | £0.06 – £0.10/hr | £180 – £250 | Gas at 5.7p/kWh; low 35–45°C flow keeps boiler condensing |
| Wet — air source heat pump | £0.04 – £0.07/hr | £130 – £210 | Electricity but COP 3.0–3.5, so ~1 unit in = 3+ out |
| Radiators — gas boiler (comparison) | £0.08 – £0.13/hr | £230 – £320 | Higher 60–70°C flow, boiler less efficient |
Figures are indicative for a reasonably insulated 15m² room and vary with insulation, target temperature and run hours. A small 4m² bathroom electric system used 2 hours a day costs roughly 55p–75p per day. The key takeaway: wet UFH on gas or a heat pump costs a fraction of electric to run, which is why electric is reserved for small, intermittently-used rooms.
Is Underfloor Heating Cheaper to Run Than Radiators?
Wet underfloor heating is cheaper to run than radiators — typically by 15–25%. It works because UFH heats from a large, low-temperature surface (35–45°C) rather than a small, hot radiator (60–70°C). The lower flow temperature keeps a condensing boiler in its efficient range and lets a heat pump run at a much higher COP, so you get the same warmth for less fuel. The radiant heat also feels comfortable at a slightly lower air temperature, shaving another 1–2°C off the thermostat. Electric underfloor heating, however, is not cheaper than radiators — it draws mains electricity at roughly four times the unit price of gas, which is exactly why it belongs in small rooms used for short bursts, not as a whole-house heat source.
Underfloor Heating & Heat Pumps: Why It's the Gold Standard
If you are installing or considering an air source heat pump, wet underfloor heating is the single best heat emitter you can pair it with. The reason is flow temperature. A heat pump is most efficient when it produces water at a low 35–45°C — and that is exactly the temperature wet UFH is designed to run at. Radiators, by contrast, usually need 55–65°C to put out enough heat, which forces the heat pump to work harder and drops its efficiency.
| Heat Emitter | Flow Temp Needed | Heat Pump COP | Relative Running Cost |
|---|---|---|---|
| Wet underfloor heating | 35–45°C | 3.0 – 3.5 | Lowest (baseline) |
| Oversized low-temp radiators | 45–50°C | 2.6 – 3.0 | ~15–20% higher |
| Standard radiators | 55–65°C | 2.0 – 2.5 | ~40% higher |
COP (coefficient of performance) is the heat output divided by electricity input. At COP 3.5, every 1kWh of electricity delivers 3.5kWh of heat. Underfloor heating with a heat pump can cut running costs by around 40% versus radiators on the same heat pump — the lower the flow temperature, the more efficient the system.
In practice this means a new build with a heat pump and wet UFH throughout is the most economical low-carbon heating you can specify in 2026. If you are retrofitting a heat pump into an older home, fitting wet UFH on the ground floor (with low-temperature radiators or electric mats upstairs) gives you most of the efficiency benefit. Pairing a heat pump with wet UFH also qualifies for the £7,500 Boiler Upgrade Scheme (BUS) grant, which runs through March 2028 — see our heat pump cost guide for grant eligibility.
Floor Build-Up, Manifold, Zones & Thermostats
Beyond the per-m² heating cost, a wet system needs a manifold and controls, and every system raises your floor height — both decisive factors in a retrofit. Here is what they add and the constraints to plan around.
Floor Build-Up Height (Critical for Retrofit)
Height is the number-one retrofit constraint. If the floor rises too far, doors catch, skirtings look wrong and you trip on thresholds. The table shows typical build-up by system.
| System | Added Floor Height | Notes |
|---|---|---|
| Electric mat under tile | 3–6mm + adhesive | Lowest build-up; ideal where height is tight |
| Wet low-profile overlay | 15–20mm | No screed; tile or LVT laid directly on top |
| Wet between joists (suspended) | 0mm (within floor void) | Hidden in joist space; access from above or below |
| Wet in new screed | 65–100mm | New build/extension; set into the slab |
For retrofit, low-profile overlay (15–20mm) is the usual wet choice; doors may need trimming and thresholds adjusting. Always insulate beneath the heat (insulation boards under electric mats, or insulated overlay panels for wet) — without it, heat escapes downward and running costs roughly double.
Manifold, Zone Valves & Thermostats (Wet Systems)
A wet system is fed by a manifold — the brass or stainless hub that distributes warm water to each floor loop. It carries a blending/mixing valve that mixes hot boiler or buffer water down to the 35–45°C the floor needs, a circulating pump, and one actuator per zone that opens and closes as each room's thermostat calls for heat. Smart and wireless thermostats cost more but allow per-room scheduling.
| Component | Typical Cost (supplied) | What It Does |
|---|---|---|
| Manifold + mixing unit + pump | £350 – £900 | Distributes & blends water to floor loops |
| Actuator (per zone) | £25 – £45 | Opens/closes loop on thermostat demand |
| Zone thermostat (wired) | £60 – £120 | Controls one room/zone temperature |
| Smart/wireless thermostat | £120 – £200 | App control, scheduling, geofencing |
| Wiring centre + controls (4 zones) | £800 – £1,800 total | Complete multi-zone control package |
Zoning is one of the big advantages of wet UFH: each room can be set to its own temperature and schedule, so you only heat the spaces you use. Budget £800–£1,800 for a typical 4-zone manifold, controls and wiring before pipe and labour.
Response Time & Controls
Electric mats under tile respond fastest — comfortable in 20–45 minutes — which is why they suit on-demand bathroom use. Wet systems in screed are slower (1–3 hours) because the screed stores heat, so they are best run on a steady, low setting with weather compensation rather than switched on and off; low-profile wet overlays respond faster, at 30–60 minutes. Modern smart thermostats with learning schedules and open-window detection close most of the convenience gap.
Best Floor Finishes for Underfloor Heating
Your floor finish makes or breaks an underfloor heating system. The best finishes are thin and thermally conductive so heat passes through quickly; thick, insulating finishes (deep carpet, solid timber) trap heat below and waste it. Crucially, sensitive finishes have a maximum safe surface temperature, and carpet has a maximum combined tog value.
| Floor Finish | Suitability | Max Surface Temp | Notes |
|---|---|---|---|
| Tile & natural stone | ★★★★★ Best | ~29°C | Most conductive, fast response, ideal partner |
| Polished/microcement screed | ★★★★★ Excellent | ~29°C | Acts as part of the heated mass |
| LVT & laminate | ★★★★☆ Very good | ~27°C | Thin, dense, fast response, great value — check it's UFH-rated |
| Engineered wood | ★★★★☆ Good | ~27°C | Only stable timber for UFH; solid wood not advised |
| Carpet (low tog) | ★★★☆☆ With care | ~27°C | Carpet + underlay must total ≤2.5 tog |
| Solid hardwood | ★★☆☆☆ Avoid | — | Prone to warping, cupping and gapping |
Surface temperature is limited to protect the finish and for comfort: tile and stone tolerate ~29°C, while wood, LVT and carpet are capped at ~27°C. For carpet, the combined tog of carpet plus underlay must not exceed 2.5 tog — choose a thin, dense, low-tog carpet with a UFH-compatible underlay, or the floor simply insulates against its own heat.
In short: choose tile or stone for the best performance (perfect for bathrooms, kitchens and hallways), LVT, laminate or engineered wood for living spaces and bedrooms, and treat carpet as workable only if you keep the tog low. Avoid solid hardwood over UFH — engineered wood gives the same look without the movement.
Underfloor Heating Cost: Frequently Asked Questions
Electric underfloor heating costs £60–£120/m² supplied and installed in 2026, while wet (water) underfloor heating costs £90–£190/m². By project: a small bathroom is £400–£1,200, a kitchen-diner £1,500–£3,500, and a whole-house wet system £6,000–£13,000 in a new build (£12,000–£22,000 retrofitted). Electric is cheaper per room; wet is cheaper to run and the right choice for large areas. London and the South East add 15–25%.
Electric is best for single rooms and retrofits where you want a thin build-up and fast warm-up — a bathroom or en-suite is the classic case. Wet is best for whole-house projects, extensions and new builds because it's far cheaper to run and integrates with your boiler or heat pump. As a rule of thumb, use electric for rooms under 10m² and wet for anything larger or whole-floor.
Wet underfloor heating is typically 15–25% cheaper to run than radiators because it works at a low 35–45°C flow temperature (versus 60–70°C), keeping a condensing boiler efficient and a heat pump at a high COP. Electric underfloor heating is not cheaper than radiators — it uses mains electricity at roughly four times the unit price of gas, so it's best reserved for small rooms used a few hours a day.
Yes. Electric mats or low-profile wet overlay systems can be retrofitted into most homes. Low-profile wet adds only 15–20mm to floor height and needs no deep excavation; electric mats add just 3–6mm plus adhesive. The main constraints are floor build-up, door clearances and skirting heights, which is why retrofit runs 20–50% more than new build once floor lifting, levelling and reinstatement are included.
Yes — it's the ideal pairing. Wet underfloor heating runs at a low 35–45°C flow temperature, exactly where an air source heat pump is most efficient, achieving a COP of 3.0–3.5 versus 2.0–2.5 with radiators at 60°C. In practice, UFH with a heat pump can cut running costs by around 40% compared with radiators on the same heat pump, which is why it's considered the gold standard for low-carbon UK home heating.
Tile and natural stone are best because they're highly conductive, transfer heat quickly and tolerate up to about 29°C. LVT and laminate are thin and dense, so they respond fast and offer great value (cap ~27°C). Engineered wood is the only stable timber recommended over UFH. Carpet works only if the combined tog of carpet and underlay stays at or below 2.5 tog — thicker carpet insulates the floor and wastes heat.
A typical 4m² bathroom electric system costs £400–£1,200 supplied and fitted in 2026, including the heating mat, insulation boards, thermostat and Part P connection. A loose-wire kit for an awkwardly shaped 4.5m² room starts around £290 for materials alone. Running it two hours a day costs roughly 55p–75p at the April 2026 electricity price cap.
A manifold with mixing unit, pump and actuators typically costs £350–£900 supplied, depending on the number of zones. Each zone needs a thermostat (£60–£200) plus an actuator (£25–£45). A complete 4-zone manifold, controls and wiring centre usually adds £800–£1,800 to a wet project before pipe and labour.
Electric under tile is fastest, reaching comfort in 20–45 minutes, which is why it suits bathrooms. Wet UFH in screed is slower (1–3 hours) because the screed stores and releases heat gradually; low-profile and overlay wet systems respond faster at 30–60 minutes. Slower wet systems are best run on a steady low-temperature setting rather than switched on and off.
Whole-house wet UFH in a new build costs £6,000–£13,000 for an average 100–150m² home — roughly £60–£110/m² because pipe is laid straight into the screed with no floor lifting. The same project retrofitted into an existing two-storey house costs £12,000–£22,000 once floor build-up, levelling and reinstatement are factored in. London and the South East add 15–25%.
Underfloor heating itself doesn't need planning permission, but the work must comply with Building Regulations. Electric systems fall under Part P (electrical safety) and should be connected by a registered electrician who self-certifies. Wet systems must meet Part L (energy efficiency), including correct floor insulation beneath the pipes, and any associated heat source or unvented cylinder has its own notification requirements. A competent installer handles certification.
Yes. A wet system runs off a standard gas combi or system boiler via a blending manifold that mixes the hot boiler water down to the 35–45°C the floor needs. Because the boiler runs at a lower return temperature it stays in its condensing range and uses around 25% less energy than the same heat through radiators. A 12m² kitchen on gas costs roughly £1.60–£2.40 per day to run.
How We Calculated These Figures
All installation rates are verified against insured underfloor-heating-specialist quotes gathered across our network of 519 UK towns in Q3 2026. Per-m² figures are supplied-and-fitted ranges; wet-system costs are shown separately for manifold, controls and heat source. Running costs use the Ofgem April 2026 price cap (24.7p/kWh electricity, 5.7p/kWh gas). Heat-pump efficiency figures (COP 3.0–3.5 at 35–45°C flow), surface-temperature limits and the 2.5-tog carpet ceiling reflect current industry and manufacturer guidance.
- Underfloor Heating Manufacturers Association (UHMA) — system types, flow temperatures and floor-finish compatibility guidance.
- Chartered Institute of Plumbing & Heating Engineering (CIPHE) — wet-system design and heat-source integration best practice.
- Building Regulations Part L (energy efficiency) & Part P (electrical safety) — insulation, certification and compliance requirements.
- Ofgem energy price cap, April 2026 — electricity and gas unit rates used for running-cost calculations.
Prices are indicative ranges for guidance only; your project may differ with floor area, build-up, controls and region. London and the South East typically add 15–25%. For a precise figure, get free fixed-price quotes from vetted specialists above. Read about our research process at /editorial-standards.
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