Underfloor Heating Cost Calculator

Installing underfloor heating can be a very worthwhile addition to your home. Whether you are investing in a new build property, building an extension, renovating your home, or just looking to upgrade one particular room, installing underfloor heating can make a huge difference to how comfortable your home feels.

The cost of underfloor heating can vary by quite a lot depending on the system you choose, the size of the area, and the condition of your existing floor. This is where an underfloor heating cost calculator comes in handy.

Our underfloor heating cost calculator can provide you with an estimated installation price based on your specific project requirements. Enter the details that most closely match your property to get an indication of what you could expect to pay for the work.

Underfloor Heating Cost Calculator

How to Use Our Underfloor Heating Cost Calculator

Our underfloor heating cost calculator is designed to give you a quick estimate of the costs based on the main factors that affect underfloor heating installation costs.

You will be asked things that may affect the overall cost, such as:

• The type of underfloor heating you want.
• The size of the area that you want to heat.
• Whether the property is a new build or an existing home.
• The condition and construction of the existing flooring.
• Your location in the UK.

Make sure to choose the options that most closely match your particular project.

The calculator will then provide an estimated installation cost.

Remember that the result is an estimate rather than a fixed quote. The final price can change once the floor, heating system, and installation requirements have been assessed.

What Type of Underfloor Heating Do You Need?

The type of system that you choose is one of the biggest factors affecting the underfloor heating installation cost. The two main options are electric and wet, or water-based, underfloor heating systems.

Electric Underfloor Heating

This type of underfloor heating system uses heating cables or mats underneath the floor. It generally has a lower upfront installation cost and can be suitable for smaller areas such as bathrooms and ensuites.

Wet Underfloor Heating

This type uses pipework connected to a boiler or heat pump to circulate heated water underneath the floor. Installation is usually more difficult and will take longer as it requires pipework and suitable heating controls. This makes the initial cost higher, particularly if you are adding this type of system to an existing property.

How Does Floor Area Affect the Cost?

The size of the flooring and the number of square metres being heated can affect the overall cost. A larger area will require more heating cable, mats, or pipework. Larger areas will also take longer to install.

Underfloor heating prices are commonly calculated as a cost per square metre. However, the cost per square metre is not necessarily the same for every project. Smaller rooms can have a higher cost per square metre because certain installation costs are spread across a smaller area.

For example, currently, electric underfloor heating costs around £40-£90 per square metre, including materials and labour. On the other hand, wet underfloor heating is typically around £100-£190 per square metre, including materials and labour.

Does the Existing Floor Affect Installation Costs?

Yes, the existing floor can make a significant difference to the cost of installing underfloor heating.

A straightforward installation may require relatively little preparation.

However, if you’re adding underfloor heating to an existing home, the work may involve:

• Removing existing flooring.
• Lifting floorboards.
• Levelling the subfloor.
• Installing insulation boards.
• Installing a screed.
• Raising the floor level.
• Replacing the final floor covering.

The more preparation that is required, the more you can expect to pay for labour and materials. The existing flooring may also need to be removed and disposed of before the heating system can be installed.

A new floor may then be required once the heating installation is complete. New flooring costs somewhere between £20 and £250 per square metre on average. However, the price can vary depending on the materials used, the size of the floor, and your area in the UK.

New Build vs Retrofitting Underfloor Heating

Whether you have underfloor heating fitted during a new build or during renovations to an existing property can have a major impact on the overall cost.

If you are installing a system during a new build, extension, or major renovation, this can be more straightforward because the floor construction can be designed around the heating system. There is less need to remove existing finishes, alter floor levels or work around an occupied room.

Retrofitting underfloor heating can involve considerably more preparation work. Your existing flooring may need to be lifted, the subfloor prepared, and you may need to add insulation before the heating system can be installed. Additional work may also be needed to ensure doors, skirting boards, and other fixtures can accommodate any change in floor height.

For this reason, the prices can vary. Electric systems in older homes tend to be around £50-£90 per square metre, compared with £40-£80 per square metre for new builds. For wet systems, the corresponding costs are around £150-£190 per square metre for older homes and around £100-£140 per square metre for new builds.

Does Floor Insulation Affect the Cost?

Insulation underneath the underfloor heating helps to reduce heat loss downwards, directing more heat towards the room above. Depending on the floor construction, you may want to choose insulation boards or another suitable insulation method.

Adding insulation will increase the initial cost of the project. However, it can help the heating system operate more effectively.

Building regulations guidance also includes some requirements relating to limiting heat loss from floors with underfloor heating. Approved Document L states that ground floor and floors in contact with the outside should be insulated to limit heat loss. Also, certain underfloor heating systems require a layer of insulation beneath the heated layer.

Additional Underfloor Heating Costs

The heating system itself may not be all you need to pay for with this type of project. Depending on your property, you may need to also budget for any of the following:

• Removing existing flooring.
• Floor preparation and levelling.
• Insulation boards.
• Screeding.
• New floor coverings.
• Thermostats and heating controls.
• Electrical work.
• Plumbing and pipework.
• Additional heating zones.
• Manifolds for wet systems.
• Boiler or heat pump alterations where required.

These additional costs will not apply to every installation. The calculator can provide an indication of the main installation cost; however, additional work should be discussed at the point when you are obtaining quotes.

How Much Does Underfloor Heating Cost?

As a general UK benchmark, you can expect to pay:

• Electric - £40-£90 per square metre (includes materials and labour)
• Wet/water - £100-£190 per square metre (includes materials and labour)

These figures are based on current 2026 pricing data.

For individual projects, you may expect to pay around £600-£900 for a 12m² kitchen electric underfloor heating installation. If you choose a wet system for the same area, this may cost more like £1200-£1500. A 20m² living room could cost around £800-£1200 for the electric underfloor heating or £1800-£2200 for a wet system.

The actual cost of your project can be higher if you need substantial floor prep work, new flooring, insulation or any heating system alterations.

How Much Does Electric Underfloor Heating Cost?

Electric underfloor heating typically costs less to install than a wet system. Heating mats are commonly used across regularly shaped areas. Alternatively, loose-wire systems can be very useful for places where the heated area has a more complicated shape.

The size of the room, amount of floor preparation, the chosen system and location can all affect the overall price. Electrical work is also required to connect the system and thermostat.

Electric floor heating is covered by Part P of the Building Regulations, so all the electrical installation work must comply with the relevant requirements.

How Much Does Wet Underfloor Heating Cost?

Wet underfloor heating generally costs more to install. This is mostly because of the pipework that is needed during the installation and the fact that it needs to be connected to your home’s heating system.

Wet underfloor heating is particularly good for larger areas, new builds and for large renovation projects where the flooring can be constructed around the system. A wet system can also work well with a heat pump because both operate effectively at lower water temperatures.

If your existing boiler cannot meet the additional heating demand, you may need to get some alterations done or even get a new boiler. A new boiler currently costs around £2400 on average for supply and installation. However, the prices can vary depending on the type and installation requirements.

How Does Location Affect Underfloor Heating Costs?

Labour rates can vary across the UK, so your location can affect the final price shown by the calculator.

Installation costs are generally higher in London and parts of the South East than in many other areas. If you are in these areas, you can expect to pay quite a bit more than those based in the North or other parts of the UK.

Access to the property, local demand, and the availability of tradespeople in your area can also influence the final price.

How Long Does Underfloor Heating Take to Install?

The installation time will depend on the size of the area, the type of system, and the amount of preparation that is required.

A straightforward electric system in a small room will likely not take too long to install. A wet system can take longer due to the pipework and all the other components that need to be fitted with it. On average, you can expect it to take around 1 – 2 days for an electric underfloor heating system installation and around 2 – 4 days for a wet system. However, individual projects can vary.

It is also important to remember that you don’t just need to factor in the installation time, as you will also need to factor in drying and curing time. If screed is used, the floor may need to remain undisturbed for considerably longer before you can install the final floor covering or commission the heating system. Make sure to always follow manufacturer guidance in terms of wait times.

What Are the Running Costs of Underfloor Heating?

Underfloor heating running costs will vary depending on the system, the size of the room, and how often it is used. As a general guide, you can expect electric underfloor heating to cost around £25-£460 per year. On the other hand, a wet system will often cost around £15-£200 per year. However, this will depend on the area that is being heated and the usage.

For example, you may expect the running cost of electric underfloor heating to be around £140-£275 for a 12 square metre kitchen and around £230-£460 for a 20 square metre living room. A wet system is estimated at around £70-£130 and £100-£200 respectively for the same sizes of rooms.

Wet systems will generally have lower running costs because they operate at lower water temperatures, whereas electric systems use electricity directly. Your actual costs will also depend on insulation, your thermostat settings, heating schedules, energy prices and the heat source used by a wet system.

Ready to Get a Quote?

Our underfloor heating cost calculator can help to give you a useful starting point based on the size, type and location of your particular project. The actual price for the job will depend on the floor construction within your property, the underfloor heating system that you choose, and any preparation or additional work that may be needed to complete the job.

Once you have an estimate, you can then use it as a guide when requesting and comparing quotes for your underfloor heating installation.