Transform your existing property or old home with modern comforts. Retrofitting underfloor heating in old houses combines efficiency with elegance, bringing it into the 21st century in style.
A common query associated with underfloor heating is whether or not these technologically advanced systems can be installed in old houses or existing properties. Fortunately, the answers may surprise you. In this article, you will learn about installing underfloor heating in old houses, what cautions to consider beforehand, which system is best for old, existing properties, and how a difference between retrofitting and refitting can make a big difference!
Key points:
Yes, retrofitting underfloor heating in old houses is a suitable option for those looking to increase their home’s warmth and efficiency during a renovation.
By installing a new heating system directly over existing subfloors, homeowners can avoid the extensive modifications associated with new builds. This approach allows the integration of both electric and wet underfloor heating systems into existing homes, offering a modern solution that respects the building’s historical integrity.
Check out these top tips for renovating an old house.
The terms ‘retrofit’ and ‘refit’ are distinct and carry important implications for installing underfloor heating, to such an extent that we have a full article that covers retrofitting underfloor heating.
In simple terms, retrofitting refers to the process of installing a new underfloor heating system into an existing structure without removing the original subfloors. Doing it this way is ideal for those that aren’t looking for an overall renovation of the structure as well.
Conversely, refitting involves removing an existing central heating system to install it in a different location or replace it with a new one. However, this is generally not advisable with underfloor heating systems due to the risk of damaging the integral components like heating wires and mesh mats, which are designed to be installed once and not moved.
When choosing an underfloor heating system to retrofit in an existing home, it’s crucial to consider the impact on floor height.
Unlike in new builds, where adjustments to floor levels are more flexible, existing homes require systems that integrate seamlessly without altering the overall floor structure significantly.
Electric underfloor heating systems are better for retrofitting due to their minimal height adjustments. Systems that incorporate ultra-thin heating wires can be embedded directly within tile adhesive, adding only millimetres to the floor height and preserving the original room proportions.
Wet underfloor heating can be used, too, but be aware that due to the size of the pipes that these may raise the flooring within the home.
Before you start installing underfloor heating in an existing house, it’s essential to evaluate several critical aspects to ensure compatibility and effectiveness:
Most subfloors are made from suspended timber floors. Prior to adding underfloor heating to the existing property, there are two options:
If, however, the subfloor is made from concrete flooring, this will fortunately be less labour-intensive. You can lay heating elements directly on the slab, covered by a thin screed to ensure a more efficient heat distribution.
For homes lacking the necessary clearance for traditional screed, slimline systems can provide an effective alternative without significantly raising floor levels.
As well as porcelain, ceramic, and concrete flooring, stone flooring also performs well, holding and radiating heat effectively. These floor types will work best in kitchens, bathrooms, and garages.
For those preferring a warmer underfoot experience, timber options are available, too. Engineered wood, constructed from cross-laminated layers topped with a hardwood veneer, is suitable due to its stability and lower heat resistance compared to solid wood. However, care must be taken to accommodate the natural expansion and contraction of the wood with temperature changes. These floor types will work best in living rooms (or lounges), and bedrooms.
If softness is a priority, underfloor heating can also be installed under carpeted floors. It’s important to ensure that the total insulation value (Tog rating) of both the carpet and underlay does not exceed the recommended maximum. This prevents excessive insulation that could hinder the efficient upward flow of heat.
Electric underfloor heating systems are particularly suited for retrofit projects as they typically require minimal adjustments to existing floor structures.
These systems can be installed within the tile adhesive layer, adding minimal height to the floor and offering a straightforward, efficient heating solution.
Traditional older homes are known for their high energy consumption, especially during colder months. So what benefits can underfloor heating in old houses bring?
Retrofitting underfloor heating in historical buildings can still have limitations, much like any other structure.
In conclusion, retrofitting underfloor heating in existing homes, particularly old houses, offers significant benefits such as better energy efficiency, environmental friendliness, and the preservation of architectural charm. Success in such projects requires careful planning, choosing the right systems, and professional installation. Following these tips can help you achieve a comfortable, energy-efficient home without compromising its historical value.
Now that you understand how underfloor heating can be added to old houses, what about heat pumps? Take a look now.
Yes, you can usually use your existing boiler for underfloor heating, provided it has enough capacity to handle the additional demand. Most conventional boilers are compatible with both electric and hydronic (water-based) underfloor heating systems. However, it’s important to ensure that the boiler can supply water at the correct temperature needed for underfloor heating, which is typically lower than that required for standard radiators.
Not necessarily. Electric systems can often be installed directly under existing flooring materials. However, for hydronic systems, you might need to lift the current floor to install the pipework and insulation.
Careful planning and the use of appropriate materials can minimise any impact. It’s often possible to install underfloor heating without any visible changes to the property’s appearance.
Depending on your location, there may be grants or incentives to help offset the installation costs, especially if the upgrade contributes to energy efficiency improvements. It’s worth checking local government or energy supplier schemes.
Resi. (2021) 5 crucial tips for renovating an old home. [online] Available at: https://resi.co.uk/advice/general/renovating-old-home [accessed 13/09/24]
Ambrose, J., (2024) Can heat pumps be installed in older properties? The Guardian. [online] Available at: https://www.theguardian.com/environment/article/2024/may/31/can-heat-pumps-be-installed-in-older-properties [accessed 13/09/24]