Building an extension is a great opportunity to create more space and add value to your home.
But once the building work is complete, there's another important question to consider:
How are you going to heat it? Underfloor heating can be an excellent choice for extensions, particularly because the heating system can be planned and installed alongside the new floor.
From kitchen extensions and open-plan living spaces to garden rooms and larger family areas, underfloor heating can provide comfortable, discreet warmth without taking up valuable wall space.
Why Choose Underfloor Heating for an Extension?
An extension gives you the opportunity to design your heating system from the beginning. Unlike retrofitting an existing room, you can plan:
- Insulation
- Floor construction
- Heating zones
- Thermostat locations
- Flooring
- Heating output
before the final floor is installed. This can make the installation process much easier.
Electric or Water Underfloor Heating for an Extension?
The right system depends on the size and purpose of your extension.
Electric systems can be a practical option for smaller extensions or individual rooms. They are particularly suitable for:
- Kitchen extensions
- Home offices
- Conservatories
- Smaller living spaces
- Renovation projects
Water underfloor heating can be particularly suitable for larger extensions or projects where the new room is being incorporated into the property's existing central heating system. It can also work well with heat pumps and whole-house heating systems.
Underfloor Heating in a Kitchen Extension
Kitchen extensions are one of the most popular applications for underfloor heating. Kitchens often have large areas of hard flooring, which work particularly well with underfloor heating. Underfloor heating also means you don't have to sacrifice valuable wall space to a radiator. This can make it easier to design modern kitchens with:
- Tall units
- Kitchen islands
- Dining areas
- Large windows
- Open-plan layouts
Underfloor Heating in an Open-Plan Extension
Large open-plan extensions can benefit from the even distribution of heat provided by underfloor heating. Rather than relying on one or two radiators to heat a large space, underfloor heating can distribute warmth across the entire usable floor area. For larger spaces, the system should be designed around the room's heat-loss requirements.
Don't Forget Insulation
Extensions should be designed with insulation in mind from the beginning. Good insulation helps reduce heat loss and allows your heating system to operate more efficiently. With underfloor heating, suitable floor insulation can help prevent heat travelling downwards into the subfloor.
The combination of a well-insulated extension and correctly designed underfloor heating can provide a comfortable space throughout the year.
What Flooring Works with Underfloor Heating?
There are several flooring options that can work with underfloor heating. These include:
- Porcelain tiles
- Ceramic tiles
- Natural stone
- LVT
- Laminate
- Suitable engineered wood
- Some carpets
Always check the flooring manufacturer's guidance before installation. Tiles and stone are particularly popular in extensions because they transfer heat effectively and work well with the temperature changes associated with underfloor heating.
Can Underfloor Heating Heat the Entire Extension?
It can, provided the system has been correctly designed for the room. This is especially important for extensions with large areas of glazing. Windows and doors can contribute significantly to heat loss, so the heating system needs to take the room's overall heat requirements into account.
Simply choosing a system based on floor size isn't always enough.
Electric Underfloor Heating for Conservatories and Extensions
Some electric underfloor heating systems are specifically designed for areas where greater heat output may be required. This can make them worth considering for extensions and conservatories where heat loss may be higher than in other parts of the home. The construction and insulation of the room should always be considered before selecting the heating output.
Can Underfloor Heating Connect to the Existing Heating System?
Water underfloor heating can potentially be incorporated into an existing central heating system, depending on the design and heat source. However, it shouldn't simply be connected without considering the system requirements. A suitable manifold, controls and temperature management may be required. For larger projects, professional system design is recommended.
Why Plan Underfloor Heating Before the Extension Is Built?
Planning early gives you the opportunity to incorporate the heating system into the floor design.
This can help you consider:
- Floor depth
- Insulation
- Pipework or cables
- Thermostat locations
- Furniture layout
- Flooring
- Electrical requirements
Leaving the decision until the extension is finished can make installation more complicated.
If you're building an extension, underfloor heating is well worth considering. It provides comfortable, discreet heat while freeing up wall space and can be designed alongside the floor from the beginning. Whether you choose electric or water underfloor heating, the key is making sure the system is correctly sized for the space and installed alongside suitable insulation and flooring.
Planning an extension? Explore Fastwarm's electric and water underfloor heating systems or contact the team to discuss your project.
