What does wet underfloor heating cost per m² in London?
Most London installs come in at £85–£120 per square metre, fully installed. That covers design, pipework, manifold, controls, pressure testing and commissioning — not just materials.
Two identical-sized rooms can still land at opposite ends of that band. Here is what moves the price.
Key fact: Every price on this page is a typical guide range, not a fixed quote. We confirm the exact figure with a site survey and a free written quote within 24 hours.
What moves the price of underfloor heating?
1. Floor area
Bigger projects cost more in total but less per m². The manifold, controls and commissioning are fixed costs — a small bathroom carries them over a few metres, a whole house spreads them thin.
2. Retrofit vs new screed
In a new extension, pipes are clipped down and screed poured over them — the cheapest route. In an existing home we use low-profile retrofit boards over the existing floor, which cost more in materials and prep.
3. Insulation
Heat should go up into the room, not down into the ground. If your floor has little or no insulation, adding a proper layer raises the upfront cost and cuts running costs every year after.
4. Number of manifold zones
Each zone gets its own manifold circuit and thermostat, so you only heat the rooms you use. More zones mean lower bills but more valves, actuators and wiring.
5. Heat source tie-in
Connecting to an existing gas boiler is straightforward. A heat pump tie-in, or UFH running alongside radiators, needs a blending valve and proper hydraulic design.
6. Floor finish
Tile and stone conduct heat well and need nothing special. Engineered wood, vinyl and carpet work too, but tog ratings and expansion gaps affect the design.
Underfloor heating cost examples by project size
The figures below come from the £85–£120 per m² band — typical guide ranges, confirmed by free written quote. Smaller projects sit towards the top because fixed costs spread over fewer metres.
*Typical guide ranges derived from £85–£120 per m² installed — confirmed by free written quote after a site survey. Not fixed quotes.
What does underfloor heating cost to run?
Radiators need water at 60–70°C. UFH turns the whole floor into the emitter, so 35–45°C flow delivers the same comfort on less energy.
Pair it with an air source or ground source heat pump and the savings compound — heat pumps are most efficient at exactly those low temperatures. Wet UFH plus a heat pump is the cheapest heating combination to run.
On a gas boiler, low flow temperatures keep a condensing boiler in its most efficient mode, and zoning stops you heating empty rooms. Comparing with electric mats? See our wet vs electric underfloor heating guide.
What's included in a Meridian Plumbing quote?
Cheap per-m² headlines often hide exclusions. Every Meridian quote is itemised and includes:
- Full system design — heat loss calculations, pipe spacing and loop layout
- All materials — pipe, Ambiente manifold, insulation where specified, controls
- Installation by Gas Safe registered engineers, with £5M public liability insurance
- Heat source tie-in to your boiler or heat pump, with blending valve where required
- Pressure testing and commissioning, thermostats set up and demonstrated
- A clear timeline and a workmanship guarantee
Recent installations are on our work page. We cover the whole capital — see areas we cover, including Battersea, Fulham and Hampstead.
How do I get an exact price?
Three steps:
- Site survey — we measure and check your floor build-up, insulation and heat source.
- Free written quote within 24 hours — itemised, fixed in scope, with a clear timeline.
- You decide — no follow-up sales calls. If the numbers work, we book you in.
We've installed UFH across London for over 5 years, from whole-house hydronic systems to single-room retrofits in period homes — and we'll tell you straight if UFH isn't right for a space.