Can You Install Underfloor Heating in an Existing House?

Can You Install Underfloor Heating in an Existing House?

Underfloor heating is often associated with new builds, but many homeowners are surprised to learn that it can also be installed in existing properties. Whether you're renovating a kitchen, extending your home, or upgrading your heating system, modern underfloor heating solutions make retrofitting easier than ever.

So, can you install underfloor heating in an existing house?

The answer is yes. With the right design and system, underfloor heating can be successfully fitted in most homes across the UK.

What Types of Underfloor Heating Can Be Installed in Existing Homes?

There are two main types of underfloor heating:

Wet Underfloor Heating

Wet systems circulate warm water through pipes beneath the floor. They are highly efficient and work exceptionally well with air source heat pumps and modern condensing boilers.

Traditional wet systems require a screed layer and are often used in new builds. However, low-profile retrofit systems are now available, making them suitable for existing homes.

Electric Underfloor Heating

Electric systems use heating mats or cables and are easier to install, especially in smaller areas such as:

Bathrooms

En-suites

Kitchens

Conservatories

Electric underfloor heating is generally cheaper to install but costs more to run than water-based systems.

Which Rooms Are Suitable for Underfloor Heating?

Underfloor heating can be installed in almost any room, including:

Kitchens

Bathrooms

Living rooms

Extensions

Conservatories

Hallways

Open-plan spaces

Many homeowners choose to install underfloor heating as part of a renovation project or home extension, where floors are already being replaced.

Will Underfloor Heating Raise Floor Levels?

One of the biggest concerns with retrofitting underfloor heating is floor height.

Fortunately, modern low-profile systems are designed specifically for existing properties and can add as little as 15-20mm to the floor height.

This makes them ideal for renovation projects where maintaining floor levels is important.

What Flooring Works Best with Underfloor Heating?

Most floor finishes are compatible with underfloor heating, including:

Tiles and Stone

These provide excellent heat transfer and are commonly used in kitchens and bathrooms.

Engineered Wood

A popular choice that works well with correctly designed systems.

Vinyl and Laminate

Many modern products are suitable for underfloor heating, but always check manufacturer recommendations.

Carpet

Carpet can be used, although thick carpets and underlays may reduce efficiency.

Is Underfloor Heating Suitable for Older Homes?

Yes. Even Victorian and traditional properties can benefit from underfloor heating.

A professional heat loss calculation and system design are essential to ensure the system delivers enough heat and works efficiently.

Older homes may also benefit from additional insulation improvements to maximise performance.

Can Underfloor Heating Work with Heat Pumps?

Absolutely.

Underfloor heating and air source heat pumps are considered the perfect combination.

Because underfloor heating operates at lower temperatures than radiators, it allows heat pumps to run more efficiently and achieve higher performance.

This can help reduce energy consumption and improve comfort throughout the home.

How Much Does It Cost to Install Underfloor Heating in an Existing House?

Costs vary depending on:

Property size

Type of system

Floor construction

Existing floor coverings

Number of rooms being heated

Typical costs are:

Single room retrofit: £1,500–£3,000

Ground floor installation: £3,500–£7,000

Whole-house systems: £8,000–£15,000+

A site survey and heat loss calculation will provide a more accurate quotation.

Is Retrofitting Underfloor Heating Worth It?

For many homeowners, the answer is yes.

Benefits include:

✅ Improved comfort with even heat distribution

✅ More wall space without radiators

✅ Excellent compatibility with heat pumps

✅ Energy-efficient heating at lower temperatures

✅ Increased property appeal and modernisation

Underfloor Heating Installation Across Liverpool, Wirral and Cheshire

At 21 Degree Heating, we design and install underfloor heating systems for existing homes, renovations and extensions throughout Liverpool, Wirral, Warrington and surrounding areas.

Whether you're upgrading a single room or planning a whole-house renovation, our experienced team can recommend the right solution for your home and budget.

Get a Free Quote

Thinking about installing underfloor heating in your home?

Contact 21 Degree Heating today for a free survey and expert advice on the best underfloor heating solution for your property.