Underfloor heating costs vary a lot depending on whether you install a wet system or an electric one, whether the job is in a new build or a retrofit, and whether you are heating one bathroom or the whole house. The headline numbers most UK homeowners see online are not wrong, but they often leave out the expensive part: floor preparation, insulation upgrades, screed work and the practical realities of retrofit.
As a realistic guide, a wet underfloor heating system in the UK often comes in at around £40 to £75 per m² installed for a straightforward project. Electric underfloor heating is usually cheaper to fit at around £30 to £50 per m². However, if you are retrofitting into an existing home, total project costs can easily rise by 20% to 50% once floor lifting, levelling, thresholds and reinstatement are included.
The right choice depends less on the cheapest installed price and more on how you plan to use it. For a single en-suite or bathroom, electric mats are often the simplest answer. For a whole-house project, especially if you are also considering a heat pump, wet UFH is usually the better long-term system.
How much does underfloor heating cost?
Installed costs depend on floor area, floor construction, controls, insulation levels and whether the system is being built into a new slab or squeezed into an existing house. For a straightforward wet UFH installation, a reasonable UK budget range is £40 to £75 per m². That usually covers pipework, manifold, controls and installation, but may not include all floor finishes or major joinery and decoration reinstatement.
Electric UFH, often supplied as mats or loose cable, typically costs £30 to £50 per m² installed. In small rooms, the total project cost can look very attractive because there is no manifold, no plumbing distribution and less system design involved. That is why it is so common in kitchens, bathrooms and occasional-use spaces.
Retrofit changes the maths. If installers need to remove existing floors, use low-profile overlay boards, trim doors, alter skirtings or resolve floor height transitions between rooms, you should expect the total cost to rise by roughly 20% to 50%. Homes with poor subfloor insulation can also need extra remedial work before UFH performs properly.
As rough examples, 50m² of wet UFH in a new extension might cost around £2,000 to £3,750 before final floor coverings. The same area in a retrofit could move toward £2,400 to £5,600+ depending on access and floor build-up. A 6m² electric bathroom floor might cost only a few hundred pounds in heating materials, but the final fitted cost still depends on tiling, insulation boards and electrical sign-off.
Wet vs electric UFH
The wet-versus-electric decision is really a trade-off between upfront simplicity and long-term running cost. Wet systems cost more to install but are far cheaper to run across larger areas. Electric systems are easy to add in single rooms but expensive if used as the main heating for a whole house.
| System type | Installed cost | Running cost | Best for | Works with heat pump? |
|---|---|---|---|---|
| Wet UFH | £40-75/m² typical | Low to moderate | Whole floors, extensions, whole-house heating | Yes - ideal |
| Electric UFH | £30-50/m² typical | High | Bathrooms, small kitchens, occasional-use rooms | No - separate electric system |
If you are planning a full heating upgrade, it usually makes sense to judge systems over 10 to 20 years, not just by installation cost. That longer view is where wet UFH often starts to win.
Running costs compared
Running cost is where the gap becomes much clearer. Wet underfloor heating works at relatively low water temperatures, often around 35 to 45°C. That is much lower than many radiator systems and is exactly why it works so well with heat pumps. Lower flow temperatures usually mean better seasonal efficiency and less electricity used for the same comfort level.
Electric underfloor heating has no such efficiency multiplier. It converts electricity directly into heat, so 1kWh of electricity gives roughly 1kWh of heat. Using Ofgem's 1 January to 31 March 2026 benchmark electricity rate of 27.03p/kWh, an electric floor used as regular space heating can become expensive quickly. By contrast, a well-designed heat pump feeding wet UFH may deliver two-and-a-half to four units of heat from each unit of electricity over the heating season.
That does not make electric UFH a bad product. It simply means it is best used where comfort, convenience and limited floor area matter more than absolute efficiency, such as a tiled bathroom that needs a warm floor for short periods. For large open-plan living spaces or whole-house use, wet UFH is normally the economical option.
New build vs retrofit
Underfloor heating is easiest and cheapest in a new build or major extension because the floor is being constructed anyway. Pipe centres, insulation, screed depth and finished floor heights can all be planned in from the start. That is why developers and self-builders often choose wet UFH for ground floors.
In retrofit projects, the key question is floor build-up. Standard screeded systems need depth, and not every home can spare it. Low-profile retrofit boards reduce height but raise material costs. Existing doors, kitchen plinths, stairs and thresholds may all need adjustment. Suspended timber floors can work, but the installation detail is different and subfloor insulation becomes critical.
In other words, retrofit is not impossible, but it needs proper surveying. The wrong time to discover the floor is too high is after the manifold has been ordered.
UFH with heat pumps
If you are considering a heat pump, underfloor heating is one of the strongest combinations available. Heat pumps perform best at lower flow temperatures, and UFH is designed to spread gentle heat over a large surface area rather than blasting small hot emitters. That means the system can often keep rooms comfortable with far lower water temperatures than radiators need.
The practical effect is better heat pump efficiency, steadier comfort and lower running costs. Radiators can still work well with heat pumps if they are correctly sized, but underfloor heating is usually the cleaner fit. In many projects, that makes UFH more than just a comfort upgrade; it becomes part of the efficiency strategy.
Room-by-room or whole house?
A lot of UK homeowners do not need underfloor heating everywhere. A common approach is electric UFH in one or two bathrooms, where the goal is warm tiles and occasional comfort rather than full-time heating economy. That approach keeps installation simple and avoids major disruption.
For larger refurbishments, extensions or complete heating-system changes, whole-house wet UFH usually makes more sense. It suits open-plan layouts, pairs well with zoning controls and is especially attractive where a heat pump is planned. Trying to heat an entire house with electric mats is usually a false economy because the energy bills can outweigh the lower upfront cost.
What to expect during installation
Installation timelines depend on the system type. Electric systems can often be laid quite quickly, but they still need the floor base prepared properly, suitable insulation beneath where required, and final connection by a qualified electrician. Wet systems involve more coordination: pipe loops, manifold position, controls, pressure testing and often screeding.
If a screeded wet system is being installed, one of the biggest programme issues is drying time. Depending on screed type and thickness, you may be looking at around 4 to 6 weeks before full floor finishes or commissioning schedules can proceed safely. That needs planning into the wider renovation timeline.
Manifold location matters too. It should be accessible, sensibly central to the served zones and not simply hidden in the most awkward cupboard available. Controls are another frequent decision point. Good zoning can improve comfort and efficiency, but overcomplicated controls can cause confusion. Most homeowners want room-by-room control where it genuinely adds value, not a maze of apps and thermostats.
Frequently asked questions
How much does underfloor heating cost in the UK?
As a practical guide, installed wet underfloor heating often lands around £40 to £75 per square metre in straightforward projects, while electric underfloor heating is commonly around £30 to £50 per square metre. Retrofit work can push costs 20% to 50% higher because floors may need lifting, levelling or insulating.
Is wet or electric underfloor heating cheaper to run?
Wet underfloor heating is usually much cheaper to run, especially when connected to an efficient boiler or, better still, a heat pump. Electric underfloor heating has lower upfront cost in small rooms but uses grid electricity directly, so whole-house running costs are normally much higher.
Does underfloor heating work well with a heat pump?
Yes. Underfloor heating is one of the best emitters for a heat pump because it can deliver comfortable heat at lower flow temperatures, often around 35 to 45°C, which helps seasonal efficiency.
Is underfloor heating worth it in a retrofit?
It can be, but the floor build-up and disruption need checking carefully. In retrofits, low-profile systems, insulation depth, door thresholds and floor finishes can all affect cost and practicality. It is usually worth planning as part of a wider renovation rather than a last-minute add-on.
Related tools
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