Underfloor Heating Cost Guide
Underfloor Heating Cost Guide
Contents:
- Key takeaways
- How much does underfloor heating cost to install
- What is cheaper to run: electric or water underfloor heating?
- Underfloor heating cost examples
- How to estimate underfloor heating costs
- Factors that affect underfloor heating costs
- How to reduce underfloor heating costs
- Summary and next steps
- FAQs
Underfloor heating is a highly efficient and premium alternative to traditional radiators and can elevate the feel of any room.
The upfront costs of underfloor heating will vary depending on the nature of the job, such as whether it’s a new build project or being added as a retrofit, and any savings as a result of higher energy efficiency will depend on insulation choices and system types.
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Key takeaways
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Electric Systems (Dry) – These offer lower upfront installation costs but can incur higher ongoing costs due to the price of electricity. They are ideal for single-room retrofits but are not recommended for rooms full of fixed units and heavy static appliances.
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Water Systems (Wet) – These are best suited for whole-house systems, as, despite higher upfront costs, they are considerably cheaper long-term as they are highly energy efficient.
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Insulation – High-quality thermal insulation beneath heating elements is essential to significantly reduce heat-up times.
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Running Costs – Modern smart thermostats and proper setups mean running costs are closely tied to regional energy caps.
How much does underfloor heating cost to install?
Underfloor heating’s cost is dependent on which kind of system you go for.
Wet underfloor heating uses warm water to generate heat, whereas dry underfloor heating is powered by electric cables or heating mats. Dry systems are typically cheaper as they take less time and effort to install, while wet underfloor heating systems take far longer to install due to the increased difficulty of the job.
Whether the underfloor heating installation is part of a new build or retrofit can also affect the costs, as laying an underfloor heating system from scratch costs less than doing so after first having to lift the old flooring out.
To get a clearer picture of what installing underfloor heating costs, here is a handy guide:
|
Cost Category |
Dry System |
Wet System |
|
Supply Rate (per m²) |
£50 – £75 |
£70 – £140 |
|
Total Supply (60 m²) |
£3,000 – £4,500 |
£4,200 – £8,400 |
|
Labour Cost |
£500 – £1,000 |
£1,500 – £3,500 |
|
Installation Time |
1 – 2 days |
3 – 7 days |
|
Retrofit Cost (per m²) |
Extra £10-20 |
Extra £20-30 |
|
Total |
£3,500 – £5,500 |
£5,700 – £11,900 |
Hidden costs of underfloor heating installation
In addition to the costs per m2 there are other hidden costs of underfloor heating you should take into account before making a decision:
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Structural adjustments — water-based systems and the necessary self-levelling compound used to encase elements add 15–50mm+ to floor height. Budget for a carpenter to trim doors, alter skirting boards, and adjust stairs to match the new level.
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Insulation sub-layers — never lay heating elements directly onto bare concrete. You must fit specialised thermal boarding first, or you'll lose heat downward into the ground and pay for it dearly on every energy bill.
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Electric running costs — electric heating mats are cheap to install but expensive to run. Electricity costs more per kWh than gas. Don't use them as a primary heat source in large rooms.
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Furniture and rugs — thick rugs and flat-bottomed furniture block heat, waste energy, and can warp wood floors or crack tiles. Specify low-resistance rugs and furniture with legs.
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Specialist maintenance — water systems rely on pumps, motorised valves, and a manifold. Sludge builds up in narrow pipes over time. Budget for a chemical flush by a heating engineer every few years.
What is cheaper to run: electric or water underfloor heating?
Though wet or water underfloor heating costs more upfront than electric underfloor heating, costs over time look very different.
Wet underfloor heating costs more upfront than the electric option. However, because of the fuel sources used, the ongoing operational costs of these two underfloor heating systems over time differ greatly.
Where electric systems may seem cheaper due to their lower installation cost, based on current energy prices, it is water systems that are significantly cheaper to run over time. The price of electricity often fluctuates, too, and can mean the larger investment that comes with wet underfloor heating systems is worthwhile in the long run.
Electric underfloor heating running costs
Dry or electric underfloor heating systems work by drawing power directly from the mains electricity grid. The electrical current flows throughout the flooring and is converted into heat by the resistance in the wires. This heat then travels upwards to leave the floor warm underfoot.
In the UK, the current average rate for electricity is 26.11p per kWh. This means the cost of running an electric underfloor heating system can run fairly high, especially if left on for hours, as electricity per kWh carries a higher tariff than gas or heat energy.
Water underfloor heating running costs
Water underfloor heating uses circulated warm water from a central heating source like a boiler or heat pump. The pipes carry this warm water underneath the flooring, acting almost like a giant underfloor radiator.
Wet systems optimise fuel efficiency well, as they heat large volumes of water to a consistent temperature capable of heating the entire room. This temperature, around 35–45°C, is lower than that of a traditional radiator and more efficient as a result.
Underfloor heating cost examples
The cost of underfloor heating is dependent on more than just whether the system is wet or dry, or whether the installation is a retrofit or new build. There are numerous other factors that can alter the cost of heating, such as property scale, room type, and structural age.
Costs by property type
The cost of installing underfloor heating systems can fluctuate based on a building’s structural parameters.
A modern new build, for example, will often be cheaper to install underfloor heating into, as excellent insulation values and subfloors that are designed to receive wet pipes or electric mats with little preparation keep the setup costs to a minimum, sitting around £40–60 per m².
This is not the same for older properties, as an aged semi-detached house with suspended timber floors would require extensive preparation and labour, from lifting old floorboards out to installing proper insulation supports underneath. This would push the cost considerably higher, to around £80–120 per m².
Costs by room type
When it comes to underfloor heating, different rooms will incur different costs. This isn’t only down to room size either but is also due to some rooms being full of fixed units and heavy appliances that cannot have a dry underfloor heating system laid beneath them.
This is why typical kit prices and tradesperson connection fees for a kitchen project can fall between £1,500 and £3,000, as a wet system would typically need to be used in place of a dry one as a result of the number of units and static appliances.
A bathroom, meanwhile, is often smaller and is more compatible with an electric underfloor heating system, costing between £400 and £800 on average.
How to estimate underfloor heating costs
Estimating the cost of underfloor heating can be difficult, as it depends on a whole range of factors from the system type to the room size, insulation quality, and installation complexity.
The best way to get an idea of the cost is to work out the size of the floor space where you want it installed and which system, wet or dry, you want to go with. After that, factoring in extra for insulation, screed, thermostats, and labour costs, plus even more if it is a retrofit project, will bring you to a rough estimate of the total cost.
The average cost of underfloor heating is £50 – £75 per m² for a dry system and £70 – £140 for a wet underfloor heating system.
Factors that affect underfloor heating costs
The total cost of underfloor heating varies considerably depending on the property type, installation method, and materials used. The most common factors affecting the price are:
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System Type – Wet systems cost more than dry systems due to their more extensive labour requirements and higher difficulty.
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Insulation and Heat Loss Prevention – Poor insulation will greatly affect the ongoing running costs and energy efficiency of your underfloor heating, as heat will escape, causing slower heat-up times and higher bills.
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Subfloor Preparation – The subfloor must be properly prepared for the project. This means using levelling compounds to ensure an even subfloor and proper insulation installation. The amount of screed needed to cover the pipes and maximise heat transference will also affect the overall cost.
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Property Details – The age of the property may determine how extensive labour will be to remove old flooring and install the underfloor heating, and older properties mean a retrofit project, which piles on extra costs.
Upfront costs for wet and dry systems may seem high, but proper preparation, installation, and insulation can improve energy efficiency and long-term running costs.
How to reduce underfloor heating costs
Underfloor heating can be expensive to install and to run, but there are ways to lower any upfront and ongoing costs.
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Prepare Yourself – Laying insulation boards and routing the piping or matting yourself can be a great way to save money on labour, though it will require some DIY knowledge.
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Smart Zone Programming – Splitting your home into various areas means you can heat one room at a time with individual thermostats, only heating those you’re actively using.
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Optimise Flow Temperature – This means setting the temperature of the water in your underfloor piping to the lowest temperature possible that will still warm your home. This is exclusive to wet systems.
Summary and next steps
While upfront costs can be substantial, underfloor heating of any kind, wet or dry, can offer long-term comfort and energy efficiency. Its compatibility with modern energy can reduce ongoing costs and make it a worthwhile investment.
If you’re interested, browse our underfloor heating guide here.