Retrofitting Underfloor Heating: A Guide for Landlords in Newport, Cardiff & South Wales

What Is Retrofitting Underfloor Heating?

Retrofitting simply means adding something that wasn’t part of the original build.

For landlords in South Wales, underfloor heating is usually a retrofit, unless you’re buying a new-build where it’s included as standard. Most existing rental properties in Cardiff and Newport rely on boiler-powered central heating systems or, increasingly, air source heat pumps, with wall-mounted radiators providing warmth.

A common question landlords ask is:

“Do I need to rip up the floors to install underfloor heating?”

Because underfloor heating systems sit beneath floor coverings, some disruption is unavoidable — but the extent depends on the system you choose.

Integrated Underfloor Heating 

If you’re renovating an older rental property in Newport or Cardiff, installing an integrated underfloor heating system during structural works can be cost-effective in the long run.

Concrete subfloors

If the property has a concrete subfloor, it may need to be dug up to install underfloor heating pipes. An alternative is milling, where channels are cut into the concrete and pipes inserted. While less disruptive, milling often lacks insulation beneath the pipes, which can reduce energy efficiency — an important consideration for EPC ratings.

Joisted subfloors

For properties with timber joisted floors, pipes can be laid between joists with insulation added below. This is generally less disruptive and well-suited to many traditional South Wales homes.

Newer properties

In newer builds, top layers of screed and insulation may be easier to remove. Underfloor heating can then be installed before re-screeding, making retrofitting simpler.

Overlay (Low-Profile) Underfloor Heating Systems

Modern overlay underfloor heating systems are ideal for landlords wanting minimal disruption.

Typically, the existing floor covering (such as carpet or laminate) is removed to expose the subfloor. Minor preparation may be required, such as:

• Levelling uneven areas

• Adding insulation under joisted floors

A slimline underfloor heating system is then installed on top of the subfloor. These systems are designed to be thin enough to avoid issues with door heights or ceilings. A self-levelling compound is usually applied before the final floor finish is laid.

For landlords in Cardiff and Newport, this approach is often the most practical retrofit option.

Types of Underfloor Heating for Rental Properties

Wet Underfloor Heating

Wet systems use hot water pumped through pipes and can be powered by:

• Gas boilers

• Air source heat pumps

Although installation costs are higher, wet systems are typically cheaper to run long-term and work exceptionally well with heat pumps — making them attractive for landlords focused on energy efficiency and future EPC requirements.

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Electric (Dry) Underfloor Heating

Electric systems use heating cables or mats laid beneath the floor.

They are:

• Cheaper to install

• Faster to fit

However, running costs are usually higher, which may impact tenant affordability in rental properties across South Wales.

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Key Considerations for Landlords Retrofitting Underfloor Heating

Before installing underfloor heating in a rental property, landlords should consider:

• Wet systems can rarely develop leaks, which may require lifting floors to repair

• Timber floors must be compatible with integrated systems

• Fixing items through the floor can damage underfloor heating

• Repairs are generally more complex than radiator repairs

• Not all systems are compatible with carpet

• Underfloor heating pairs extremely well with air source heat pumps

• Professional installation is essential for safety and compliance

• Electric systems often cost more to run than gas

• Underfloor heating can enhance tenant appeal and long-term rental value

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Is Underfloor Heating Worth It for Landlords in South Wales?

For landlords in Newport, Cardiff, and across South Wales, underfloor heating can:

• Improve energy efficiency

• Increase tenant demand

• Support long-term compliance with evolving rental standards

• Modernise older rental homes

The best results are achieved when underfloor heating is installed by experienced professionals as part of a planned refurbishment or upgrade.

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Thinking of Upgrading or Moving?

If you’re planning a renovation, upgrading your rental property, or looking to move into a new investment area, we can help.

We work with landlords across Cardiff, Newport, and South Wales, providing expert property advice, lettings support, and access to the latest available homes.

Get in touch today to explore properties, upgrades, and management solutions tailored to landlords.