Underfloor Heating Cost in London: 2026 Price Guide
Updated: Aug 8
Do you need help with installation or a more precise price quote? Call us right now.
Actual photo of the completed project under floor heating :
After :
Underfloor Heating Cost in London Underfloor Heating Cost in London Underfloor Heating Cost in London
Befor :
underfloor heating installation cost underfloor heating installation cost underfloor heating installation cost underfloor heating installation cost underfloor heating installation cost underfloor heating installation cost underfloor heating installation cost underfloor heating installation cost
If you're considering underfloor heating for your London home, one of the first questions is likely to be: how much does underfloor heating cost?
The cost of underfloor heating in London depends on the type of system, the size of the area, the existing floor construction, insulation, flooring materials and the complexity of the installation.
As a general guide, water-based underfloor heating can typically cost around £40 to £80 per square metre for installation, although the final price can be higher where significant floor preparation, insulation or alterations are required.
Below, we explain typical underfloor heating installation costs in London, what affects the price, bathroom underfloor heating costs, running costs and whether the system is worth the investment.
How Much Does Underfloor Heating Cost in London?
Based on typical installation requirements and our experience with heating projects, the following figures provide a useful guide to the cost of installing underfloor heating in London.
System Type | Typical Cost per m² | Best Suited For |
Water-based (Hydronic) Underfloor Heating | £40–£80+ | Larger rooms, extensions and whole-house heating |
Electric Underfloor Heating | Varies by system and installation | Bathrooms, kitchens and smaller areas |
These prices should be treated as a guide rather than a fixed quotation. The actual underfloor heating cost per square metre will depend on the property and the work required.
Additional costs may apply for:
Removing existing flooring
Levelling or preparing the subfloor
Insulation boards
New screed
Thermostats and heating controls
Manifolds and pipework
Boiler or heat pump modifications
Electrical work
New floor finishes
For an accurate price, the property and installation requirements should be assessed individually.
Example Underfloor Heating Cost for a 20m² Room
For a 20m² room, a water-based system costing approximately £40 to £80 per square metre could result in an estimated installation cost of:
Water underfloor heating: approximately £800 to £1,600
However, this is only a basic example.
If the existing floor needs to be removed, the floor level changed, additional insulation installed or the heating system modified, the total project cost may be higher.
VAT and significant floor preparation work may also need to be added depending on the quotation.
How Expensive Is Underfloor Heating?
Underfloor heating can be more expensive to install initially than conventional radiators, particularly when retrofitting a water-based system into an existing property.
However, the cost needs to be considered alongside the long-term benefits.
Underfloor heating distributes heat across a much larger surface area than a radiator. This allows many systems to operate using lower water temperatures while still providing comfortable and even heating throughout the room.
Whether underfloor heating is expensive for your property therefore depends on:
The type of system
Size of the heated area
Whether the property is being renovated
Existing floor construction
Insulation quality
Heating source
Floor covering
Labour requirements
Installing underfloor heating during a renovation or extension is often more cost-effective because the floor is already being altered.
What Is Underfloor Heating?
Underfloor heating, sometimes searched for as under floor heating, heats a room from beneath the finished floor instead of relying primarily on wall-mounted radiators.
The system distributes heat evenly across the floor surface, helping reduce cold areas within the room.
There are two main types of underfloor heating.
Electric Underfloor Heating
Electric systems use heating cables or mats installed underneath the floor covering.
They can be particularly suitable for:
Bathrooms
Kitchens
Small rooms
Individual zones
Retrofit projects
Electric systems can often be simpler to install in smaller areas, although their running costs depend heavily on electricity prices and how frequently the system is used.
Water-Based Underfloor Heating
Water or hydronic underfloor heating uses pipes installed underneath the floor.
Warm water circulates through these pipes from a suitable heating source such as a boiler or heat pump.
Water systems are commonly chosen for:
Extensions
Large rooms
Ground floors
Multiple rooms
Whole-house heating
Heat pump installations
Installation can be more involved than with an electric system, but water-based underfloor heating can be particularly effective for larger areas.
Underfloor Heating Cost Per Square Metre
The cost of underfloor heating per m² is one of the easiest ways to estimate the budget for a project.
For water-based systems, a typical starting range may be around:
£40–£80 per m²
However, multiplying the room size by this figure does not always give the complete project cost.
For example, a 30m² room at £60 per m² would produce a basic estimate of:
30m² × £60 = £1,800
But additional preparation work, controls, manifolds, insulation or flooring alterations could increase the final price.
This is why an on-site assessment is important when calculating an accurate underfloor heating installation cost in London.
Bathroom Underfloor Heating Cost
Bathrooms are one of the most popular places to install underfloor heating.
The exact bathroom underfloor heating cost depends mainly on:
Bathroom size
Electric or water system
Existing floor
Type of tiles
Insulation
Thermostat requirements
Whether the bathroom is already being renovated
Electric underfloor heating is commonly considered for smaller bathrooms because heating mats can be installed underneath suitable floor finishes such as tiles.
For larger bathrooms or properties that already use water-based underfloor heating, connecting the room to a hydronic system may also be possible.
If you're already renovating your bathroom, installing underfloor heating at the same time can often reduce additional labour because the existing flooring is already being removed.
What Affects Underfloor Heating Installation Cost in London?
Several factors can significantly change the final price.
1. Type of Underfloor Heating System
Electric systems may have lower installation complexity for small rooms.
Water-based systems normally require more pipework, controls and connections, making installation more involved.
However, water systems are often better suited to larger areas.
2. Size of the Area
The larger the heated floor area, the higher the overall installation cost.
However, larger projects do not always increase proportionally because certain fixed costs, such as controls and system setup, may be spread across a larger floor area.
3. Floor Construction
The existing floor can have a major impact on installation cost.
Installing underfloor heating in a new extension can be considerably easier than retrofitting a system beneath an established floor.
Existing floors may need to be:
Lifted
Levelled
Insulated
Reconstructed
Screeded
Adjusted for additional floor height
These additional works can increase labour and material costs.
4. Insulation
Good insulation is extremely important for underfloor heating efficiency.
Insulation beneath the heating system helps direct heat upwards into the room rather than allowing it to escape downward.
A poorly insulated floor can increase heating demand and running costs.
5. Type of Flooring
Different floor coverings transfer heat differently.
Materials commonly used with underfloor heating include:
Tiles
Stone
Engineered wood
Laminate
Suitable vinyl flooring
Carpet can also work with certain systems, but the overall thermal resistance of the carpet and underlay needs to be considered.
6. Labour Costs in London
Labour prices in London can be higher than in many other parts of the UK.
Complex layouts, difficult access, multiple heating zones and extensive floor preparation can all increase installation time and therefore the total cost.
7. Thermostats and Heating Controls
Modern underfloor heating systems can use individual thermostats and separate heating zones.
For example, a property may have separate controls for the:
Living room
Kitchen
Bathroom
Bedrooms
Zoning can provide better control and potentially improve efficiency, but installing additional thermostats and controls can increase the initial cost.
How Much Does Underfloor Heating Cost to Run?
Another important question is:
How much does underfloor heating cost to run?
There isn't one fixed answer because running costs depend on several factors:
Energy tariff
Electric or water system
Size of the heated area
Property insulation
Desired room temperature
Heating schedule
Floor covering
Boiler efficiency
Heat pump efficiency
Thermostat settings
Electric underfloor heating is generally more suitable for smaller areas or rooms that are heated for shorter periods.
Water-based underfloor heating can be more economical for larger areas, particularly when designed to operate efficiently at lower flow temperatures.
Instead of focusing only on an advertised hourly running cost, homeowners should consider the entire heating system and the energy efficiency of the property.
Electric vs Water Underfloor Heating Cost
The best system depends on the property.
Electric Underfloor Heating
Advantages include:
Easier installation in smaller rooms
Thin heating mats available
Quick response times
Popular for bathrooms and kitchens
However, electricity can make operating larger electric systems expensive depending on the tariff and usage.
Water Underfloor Heating
Advantages include:
Suitable for larger areas
Well suited to extensions and new builds
Can work effectively with boilers
Particularly suitable for many heat pump installations
The main disadvantage is the more complex installation process and potentially higher initial cost.
Underfloor Heating Installation Process
The exact installation method depends on the system and floor construction, but a typical project may include the following stages.
1. Floor Preparation
Existing flooring may need to be removed and the subfloor checked to make sure it is clean, stable and level.
2. Insulation
Suitable insulation may be installed underneath the heating system to minimise downward heat loss.
3. Installing the Heating System
For electric systems, heating mats or cables are installed.
For water-based systems, pipework is positioned according to the heating design and connected to the manifold.
4. Connecting the Controls
Thermostats, sensors, manifolds and heating controls are installed and configured.
5. Installing the Floor Finish
Depending on the system, screed or another suitable layer may be installed before the final floor covering.
6. Testing and Commissioning
The complete system must be checked before being placed into normal operation.
A simple single-room installation may sometimes be completed within a few days, while larger or more complex projects can take considerably longer.
Is Underfloor Heating Worth the Cost?
For many London homeowners, underfloor heating can provide several advantages.
More Even Heating
Heat is distributed across the floor instead of originating from one radiator.
More Wall Space
Removing or reducing the need for radiators can provide greater flexibility when arranging furniture.
Comfortable Floor Temperatures
Warm floors can be particularly attractive in bathrooms and kitchens with tiled flooring.
Efficient Low-Temperature Heating
Correctly designed water-based systems can operate effectively at lower flow temperatures than many traditional radiator systems.
Compatibility With Heat Pumps
Underfloor heating is often used alongside heat pumps because of its large heat-emitting surface area.
However, whether underfloor heating is worth installing depends on the property, budget and heating requirements.
How to Reduce Underfloor Heating Costs
There are several ways to control the overall project cost.
Install underfloor heating during a planned renovation.
Make sure the property and floor are properly insulated.
Select the right system for the size of the room.
Avoid unnecessary heating zones and controls.
Choose suitable flooring materials.
Have the system properly designed before installation.
Compare the total installation and long-term running costs rather than only the initial price.
Planning the installation properly can often prevent expensive alterations later.
Frequently Asked Questions About Underfloor Heating Cost
How much does underfloor heating cost in London?
The price depends on the system, room size and floor construction. Water-based underfloor heating may typically cost around £40–£80 per square metre, although floor preparation and additional heating components can increase the final price.
How much does underfloor heating cost per m²?
A typical water-based installation may start from approximately £40–£80 per m², depending on the property and installation requirements.
How expensive is underfloor heating?
Underfloor heating usually requires a greater initial investment than simply replacing a radiator. However, the total cost depends heavily on whether the system is installed during renovation or retrofitted into an existing floor.
How much does bathroom underfloor heating cost?
Bathroom costs vary according to the room size, system type, flooring and electrical or plumbing work required. Electric systems are commonly used for smaller bathrooms, while water systems may be more appropriate where hydronic underfloor heating already exists.
Is underfloor heating expensive to run?
It depends on the system and the property. Electric systems can be more expensive to operate across large areas, while water-based systems can be efficient when correctly designed and combined with an efficient boiler or heat pump.
Can underfloor heating work with an existing boiler?
Many modern boilers can operate with water-based underfloor heating, although system design, controls and flow temperatures need to be checked before installation.
How long does underfloor heating last?
A professionally installed water-based system can provide many years of service. The lifespan of individual components such as pumps, thermostats and controls can differ from the lifespan of the pipework itself.
Can I install underfloor heating myself?
Some electric systems are marketed for DIY installation, but electrical connections must meet applicable regulations. Water-based systems generally require considerably more heating and plumbing knowledge and are normally professionally installed.
Get an Underfloor Heating Quote in London
The best way to determine the actual underfloor heating cost for your London property is to assess the size of the area, floor construction, existing heating system and the type of underfloor heating required.
At JM Plumbing, we can assess your property and recommend a suitable underfloor heating solution based on your heating requirements and budget.
Contact us to discuss your project and request an underfloor heating installation quote in London.
Final Thoughts on Underfloor Heating Cost in London
So, how much does underfloor heating cost?
For water-based systems, a typical starting guide of around £40 to £80 per square metre can help with initial budgeting. However, the final cost depends on floor preparation, insulation, system type, controls, room size and installation complexity.
For bathrooms and smaller rooms, electric underfloor heating may be worth considering, while water-based systems are often better suited to larger rooms, extensions and whole-house installations.
The most important step is to have the system properly assessed and designed before installation so that both the initial cost and long-term running costs are taken into account.
Comments