Underfloor Heating Installation: Cost & Options (2026 UK)
Underfloor heating (UFH) delivers gentle, even warmth and frees up wall space, which is why it is now standard in most extensions and new builds. The big decision is between a wet (water) system and an electric system, and whether you are fitting it in a new build/extension or retrofitting into an existing floor. Each combination has a very different cost and disruption level. This guide compares them clearly, sets out realistic 2026 costs per m², and helps you match the right system to each room.
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How much does underfloor heating cost in 2026?
Typical 2026 UK underfloor heating costs, supplied & fitted:
- Electric UFH (per m², single room) — £75–£120
- Wet UFH in a new build/extension (per m²) — £100–£160
- Wet UFH retrofit (per m², low-profile) — £140–£200
- Typical wet UFH whole ground floor — £5,000–£9,000+
Electric systems are cheapest to install and ideal for single rooms like bathrooms; wet systems cost more up front but are much cheaper to run over a whole floor, especially paired with a modern boiler or heat pump. Retrofitting into an existing floor costs more than fitting during a build because of the floor build-up work involved.
Compare the Two System Types
The right system depends on the size of the area, the floor build-up you can accommodate, and whether running cost or install cost matters more.
Wet (water) underfloor heating
Warm water flows through pipes in the floor, fed by your boiler or heat pump via a manifold. Higher install cost, but low running cost and the best choice for whole floors and open-plan spaces. It runs at a low flow temperature, which makes it an ideal match for a heat pump. Adds height to the floor, so it is easiest in a new build or extension.
Electric underfloor heating
Thin heating mats or cables under the floor finish, wired to a thermostat. Cheapest and least disruptive to install, with a very low floor build-up, making it perfect for a single bathroom, kitchen or en-suite. Running costs are higher per unit of heat, so it is best for smaller areas or as a comfort boost rather than primary heating for a whole house.
What Changes the Price
New build vs retrofit
Fitting during a build or extension is far cheaper than retrofitting, which may need floor levels raised, doors trimmed or a low-profile system.
Area & layout
Larger, simpler areas cost less per m²; lots of small rooms and complex pipe runs add labour and manifold zones.
Floor finish & insulation
Insulation under the system is essential for efficiency, and tile or stone finishes conduct heat better than thick carpet.
Controls & heat source
Smart zoned controls add cost but improve comfort and efficiency, and pairing wet UFH with a heat pump maximises the running-cost savings.
Common Questions
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