Quick Answer
Underfloor heating costs £50–£150/m² for electric systems and £100–£200/m² for wet (water) systems in 2026. A typical 15m² room costs £750–£2,250 (electric) or £1,500–£3,000 (wet) fully installed.
Underfloor heating (UFH) has moved from a luxury reserved for high-end new builds to an increasingly common upgrade in UK homes — particularly during bathroom renovations, kitchen extensions, and ground floor refurbishments. In 2026, falling electric mat prices and wider awareness of wet system benefits have made UFH a realistic option for many homeowners. The key decision is which type to install, as the costs, installation complexity, and running costs differ significantly.
This guide covers both main UFH systems — electric heating mats and wet hydronic systems — with 2026 prices, running cost comparisons, and practical advice on when each is the better choice. All prices include supply and installation unless otherwise noted.
In this guide
Electric vs Wet Underfloor Heating: Which Is Better?
The choice between electric and wet UFH comes down to the size of the area being heated, how you're heating the rest of your home, and whether you're doing a renovation or a new build. Here is a head-to-head comparison:
| Factor | Electric (Mat/Cable) | Wet (Hydronic) |
|---|---|---|
| Installation cost (per m²) | £50 – £150/m² | £100 – £200/m² |
| Installation disruption | Low — thin mat under tiles | High — screed floor or deep renovation |
| Best for | Bathrooms, small kitchens, single rooms | Whole-house, extensions, new builds |
| Running cost (per m², per hour) | ~£0.04–£0.08 at 2026 rates | ~£0.01–£0.03 (connected to boiler) |
| Heating up time | Fast (15–30 mins) | Slow (30–90 mins) |
| Floor depth added | 3–5mm | 80–150mm (screeded systems) |
| Suitable with heat pump? | Yes (ground source or air source) | Yes — ideal pairing |
| Maintenance | None once installed | Occasional pressure checks; flushing |
| Lifespan | 20–30 years | 25–40 years |
Electric underfloor heating is the most practical choice for single-room retrofits — particularly bathrooms and kitchens. The heating mat sits directly beneath tiles in a thin layer of adhesive or self-levelling compound, adding only 3–5mm of floor height. Installation typically takes one day and requires an electrician to connect the thermostat and wire the system under Part P of the Building Regulations.
Wet underfloor heating (also called hydronic UFH) circulates warm water through pipes laid within the floor structure, connected to your boiler or heat pump. It is more expensive to install but considerably cheaper to run, making it the right choice for large areas or where the system will be used for many hours per day. It pairs particularly well with heat pumps, which operate at lower flow temperatures that UFH handles efficiently. For more on heat pumps as a heating option, see our guide on heat pump vs gas boiler in the UK.
Underfloor Heating Cost by Room Size (2026)
Here are full supply-and-install cost estimates for both system types across common UK room sizes:
| Room Size | Electric System (total) | Wet System (total) |
|---|---|---|
| Bathroom (4–6m²) | £200 – £900 | £400 – £1,200 |
| Kitchen (10–12m²) | £500 – £1,800 | £1,000 – £2,400 |
| Living room (15–20m²) | £750 – £3,000 | £1,500 – £4,000 |
| Open-plan kitchen/diner (25–35m²) | £1,250 – £5,250 | £2,500 – £7,000 |
| Whole ground floor (60–80m²) | £3,000 – £12,000 | £6,000 – £16,000 |
These costs include the heating system (mat/cable or pipe), thermostat, associated controls, and installation labour. Wet systems also include connection to the boiler manifold. Note that wet systems in existing properties require significant floor preparation — either a screed pour (which adds 80–100mm of floor height) or a low-profile panel system (which adds 20–30mm).
If you're installing UFH as part of a new bathroom or kitchen renovation, the combined project guide on how much a new bathroom costs in the UK covers the full picture including tiling and sanitary ware. For the heating side, see our guide on how much a new boiler costs if you're upgrading your heat source at the same time.
Running Costs: Electric vs Wet Systems
The higher installation cost of wet systems is partially offset by lower running costs. Here is a realistic comparison based on 2026 UK energy prices:
| Scenario | Electric UFH | Wet UFH (gas boiler) |
|---|---|---|
| Bathroom (5m²), 4 hrs/day, 150 days/year | ~£80–£120/year | ~£25–£45/year |
| Living room (20m²), 6 hrs/day, 200 days/year | ~£500–£800/year | ~£120–£200/year |
| Open-plan (35m²), 8 hrs/day, 200 days/year | ~£1,000–£1,600/year | ~£200–£350/year |
For a bathroom with a small area and limited hours of use, the running cost difference between electric and wet systems is modest — often under £100 per year. At this scale, the lower installation cost of electric UFH usually makes it the better economic choice. For larger areas used many hours a day, the higher installation cost of wet UFH can be recovered through lower running costs within 5–10 years.
What Affects Underfloor Heating Installation Cost?
- System type: Wet systems cost roughly twice as much to install as electric systems per m², but are cheaper to run in larger areas.
- Floor preparation: Wet screeded systems require removing existing flooring, preparing the sub-floor, laying pipes, pouring screed, and waiting 4–6 weeks for it to cure before finishing. This adds significant time and cost.
- Low-profile options: Clip-rail or groove-plate wet systems (e.g., Polypipe Overlay or Wunda) can be installed at only 15–25mm depth — suitable for retrofit in existing homes without major structural change. These cost more per m² than screeded systems but save on disruption.
- Thermostat and controls: A basic programmable thermostat costs £30–£80; a smart WiFi thermostat (Hive, Nest, Tado) adds £80–£200 per zone. For a whole-house wet system with multiple zones, controls can add £500–£1,500 to the project cost.
- Electrical connection: Electric UFH requires a certified electrician to connect the thermostat and wire the system under Part P. This typically adds £150–£300 to the installation cost.
- Insulation below the system: Without adequate insulation beneath the heating element, heat is lost downward rather than upward. Adding insulation boards (essential on ground floors and in extensions) adds £5–£15/m² but significantly improves efficiency.
For finding a reliable plumber or heating engineer to install your underfloor heating, read our guide on how to find a reliable plumber in the UK.
Frequently Asked Questions
Is underfloor heating worth it in the UK?+
For new builds and major renovations, wet underfloor heating is generally worth the extra cost — particularly if paired with a heat pump, where the efficiency gains are significant. For single rooms (especially bathrooms), electric UFH is very often worth it for comfort alone, with running costs that are manageable for limited use areas. For retrofitting into existing homes without major renovation, the payback period is longer.
Can underfloor heating replace radiators completely?+
Yes, in well-insulated modern homes. UFH typically runs at lower flow temperatures (35–45°C for wet systems) than radiators (70–80°C), so the floor area needs to be larger relative to the heat load. In older, poorly insulated properties, UFH alone may not be sufficient as the primary heat source without significant insulation improvements first.
How long does it take to install underfloor heating?+
Electric UFH in a bathroom (4–6m²) can be installed in a single day. A wet system for an open-plan extension (30m²) typically takes 2–4 days to install, then 4–6 weeks for the screed to cure before flooring can be laid. Low-profile wet systems can be faster — typically 1–3 days for the same area.
Does underfloor heating work under all floor types?+
Electric UFH works best under ceramic tiles and stone — they conduct and retain heat well. It also works under engineered wood and luxury vinyl tile (LVT), but check the product specification as some have temperature limits. Solid wood flooring is generally not recommended due to expansion risk. Wet systems are compatible with most floor types when correctly installed.
Does installing underfloor heating require building regulations approval?+
Electric UFH installation requires notification under Part P of the Building Regulations because it involves adding a new circuit. Wet UFH installation is generally not notifiable to building control for existing properties, but always check with your local authority. For new build or extension projects, both types form part of the broader building regulations submission.
What is the best type of underfloor heating for a bathroom renovation?+
For a bathroom renovation, electric underfloor heating (a heating mat under tiles) is almost always the best choice. It is thin (3–5mm), easy to install during tiling, quick to heat up, and the running costs for a bathroom used 1–3 hours daily are very manageable. The wiring must be connected by a Part P registered electrician.
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