Underfloor Heating and EPC Ratings in London: What Homeowners Need to Know

Underfloor heating can make a home comfortable and distribute heat throughout a room. However, if you are selling or renting out a London property, you may wonder how an underfloor heating EPC assessment considers this type of heating system.

Underfloor heating does not automatically guarantee a higher Energy Performance Certificate (EPC) rating. The result depends on the system installed, its energy source, the property’s insulation, heating controls and other features considered under the applicable assessment methodology.

In this guide, we explain how underfloor heating relates to EPC assessments, which documents homeowners should prepare and what to consider before making energy-efficiency improvements.

What Is Underfloor Heating?

Underfloor heating provides warmth through a system installed beneath the floor surface. Unlike conventional radiators, it distributes heat across the floor area.

There are two main types of underfloor heating.

1. Wet Underfloor Heating

Wet systems use pipes beneath the floor to circulate warm water. The water usually comes from a boiler or heat pump.

The system’s performance depends on factors such as the heat source, temperature settings, controls and building insulation.

For example, a wet system connected to a heat pump operates differently from one connected to a conventional gas boiler.

2. Electric Underfloor Heating

Electric systems use heating cables, mats or other electrical elements beneath the floor.

These systems are often installed in bathrooms, kitchens and smaller areas. However, electric underfloor heating can also serve larger spaces.

Its effect on the property’s energy assessment depends on the system’s characteristics and the applicable calculation method.

Understanding which type of system you have is an important first step when preparing for an EPC assessment.

Does Underfloor Heating Improve an EPC Rating?

Underfloor heating can contribute to a property’s heating performance, but installing it does not automatically improve an EPC rating.

An EPC assesses the property’s overall energy performance. The assessment considers relevant features such as heating equipment, insulation, hot water arrangements, controls and the building’s construction.

Consequently, two properties with underfloor heating may receive different ratings.

For example, a well-insulated home with an efficient heat source and suitable heating controls may perform differently from a poorly insulated property with less efficient heating equipment.

The type of underfloor heating also matters. A wet system connected to a heat pump has different characteristics from electric resistance heating.

Therefore, underfloor heating EPC ratings depend on the complete heating setup rather than the presence of underfloor heating alone.

Before making changes, review your existing certificate and its recommendations. Our guide to EPC recommendations explained can help you understand the improvements suggested for your property.

How Does Underfloor Heating Work With a Heat Pump?

Underfloor heating is commonly paired with heat pumps because both systems can work effectively with relatively low water temperatures, depending on the installation.

A heat pump transfers heat rather than generating it solely through electrical resistance. Under suitable conditions, this can make it an efficient way to heat a building.

However, performance depends on the heat pump, system design, controls, installation quality and the property’s heat demand.

If you have both technologies, keep the documentation for each system. The assessor may need relevant information about the heating equipment and its configuration.

Our guide to EPC assessments for heat pumps in London provides further information about heat pumps and property energy assessments.

Do not assume that combining a heat pump with underfloor heating guarantees a particular EPC band. The complete property assessment determines the result.

What Information Should You Prepare for an Underfloor Heating EPC Assessment?

Preparing relevant information before your appointment can help the assessor understand your property’s heating system.

You do not necessarily need every document listed below. Gather whatever is available and let the assessor determine which evidence is appropriate.

1. Heating System Specifications

Keep the installation documents for your underfloor heating system.

These may identify the manufacturer, system type, installation date and relevant technical specifications.

If the system was installed during a renovation, the original contractor may still have useful records.

2. Boiler or Heat Pump Details

For a wet underfloor heating system, identify the equipment that supplies the heat.

Depending on your installation, useful records may include boiler specifications, heat pump details and commissioning documents.

If the system uses a heat pump, explain how it supplies heat to the underfloor circuit.

3. Heating Controls and Thermostats

Heating controls help manage when and how the system operates.

Keep any available information about thermostats, programmers, zone controls and other relevant equipment.

However, do not assume that installing a particular control automatically increases your EPC rating. Its effect depends on the applicable assessment method and the property’s existing setup.

4. Floor and Insulation Information

Underfloor heating can be installed in different floor constructions. Some systems sit within a screed, while others use different installation methods.

If you have records of floor insulation or a recent renovation, keep them accessible.

Insulation may be difficult to identify after the floor has been finished. Therefore, installation invoices, specifications or other reliable records may be useful when available.

5. Previous EPC Certificates

Locate your previous EPC if one exists.

It can help you review the property’s recorded features and recommendations. However, an earlier certificate does not guarantee that the same information remains accurate after major renovations.

You can check for an existing certificate through the official GOV.UK Find an Energy Certificate service.

For more preparation advice, read our guide to EPC assessment evidence for London property owners.

Can Underfloor Heating Reduce Energy Bills?

Underfloor heating does not guarantee lower energy bills.

Actual costs depend on the heat source, electricity and gas tariffs, insulation, thermostat settings, operating hours and how the household uses the property.

A well-designed system may provide comfortable heating at suitable operating temperatures. Nevertheless, poor controls, inadequate insulation or excessive heating can increase energy use.

Electric underfloor heating can have different running costs from a wet system connected to a boiler or heat pump. The result depends on the equipment and energy prices.

Before installing a new system, consider the total installation cost, likely usage and compatibility with the existing property.

An EPC can provide information about energy performance, but it does not guarantee actual household bills.

What If You Install Underfloor Heating During a Renovation?

If you are renovating a London property, consider the heating system alongside the wider building improvements.

For example, installing underfloor heating may involve changing floor construction, insulation or heating equipment. The final arrangement can affect how the property performs.

Before the work begins, consider these steps:

• Confirm which heating system suits the property.

• Check the floor construction and insulation requirements.

• Keep technical specifications and installation records.

• Retain documentation for any new boiler or heat pump.

• Record changes to heating controls.

• Check whether planning or building regulations requirements apply to the work.

• Review your existing EPC after the renovation.

An extension or major alteration can also affect the property information used for marketing and assessment. If your project includes additional living space, see our guide to EPC requirements for property extensions in London.

Importantly, a renovation does not automatically mean that you need a new EPC. Whether a new assessment is appropriate depends on your circumstances and the applicable requirements.

How Does Underfloor Heating Affect an EPC for an Empty Property?

An empty property may still contain a functioning underfloor heating system, even if the heating has not been used recently.

If you are preparing a vacant property for sale or rent, identify the heating equipment and make relevant documentation available.

Where possible, ensure the assessor can access the necessary areas and equipment safely. Do not dismantle finished floors simply to reveal hidden pipes or cables.

Our guide to EPCs for empty properties in London explains other points to consider before marketing an unoccupied home.

Similarly, if you have made energy-efficiency improvements while the property was vacant, keep the relevant records together.

What Other Factors Affect Your EPC Rating?

Underfloor heating is only one part of a property’s energy performance.

Other relevant features can include:

• Loft, wall and floor insulation.

• Windows and glazing.

• The main heating system.

• Hot water equipment.

• Heating controls.

• Lighting.

• Renewable energy technologies.

• Property construction and layout.

These features work together within the applicable EPC assessment methodology. Consequently, replacing a heating system without considering insulation and controls may not deliver the result you expect.

If you have recently improved your property, read our guide to EPCs for properties with conservatories in London for another example of how a property’s features may need to be considered as part of its wider assessment.

Homeowners should also review the recommendations on their existing certificate before deciding which upgrades to prioritise.

Do You Need an EPC When Selling or Renting a Property With Underfloor Heating?

Underfloor heating does not remove the usual EPC considerations for a property.

In England and Wales, an EPC is generally required when a property is sold, rented out or newly constructed, subject to the relevant rules and exemptions.

A property with underfloor heating may already have a valid certificate. EPCs are generally valid for ten years, although a newer certificate may replace an earlier one.

Before arranging another assessment, check the property’s existing record and your circumstances.

You can read the official GOV.UK guidance on Energy Performance Certificates when selling a home for further information.

Landlords should also check the requirements that apply to their specific rental property rather than assuming that every tenancy follows identical rules.

How to Arrange an EPC Assessment in London

If you need an EPC for a London property, start by checking whether an existing certificate is available and still valid.

If a new assessment is required, choose an appropriate service and provide accurate property details when booking.

Urgent EPC offers a residential EPC service in London for homeowners and landlords.

If your sale or rental deadline is approaching, you can also enquire about the Same Day EPC service, subject to appointment availability.

Before your appointment, gather any available information about your underfloor heating, boiler or heat pump, controls and insulation.

This preparation can help the assessor establish which features are present and determine the appropriate assessment approach.

Frequently Asked Questions

Does underfloor heating automatically improve an EPC rating?

No. The rating depends on the property’s overall energy performance and the applicable assessment methodology. Underfloor heating alone does not guarantee a higher rating.

Is electric underfloor heating better for an EPC than wet underfloor heating?

Not necessarily. Electric and wet systems have different characteristics. The outcome depends on the specific equipment, energy source, controls and other property features.

Can underfloor heating work with a heat pump?

Yes. Underfloor heating can work with a heat pump when the system is appropriately designed and installed. Performance depends on the building and the equipment.

Do I need documents for hidden underfloor heating pipes?

You do not necessarily need original installation documents to arrange an assessment. However, available specifications and installation records may help establish the system’s details.

Will underfloor heating increase my property’s value?

There is no guarantee. Buyers may appreciate underfloor heating, but property value depends on factors such as location, condition, market demand and buyer preferences.

Should I get a new EPC after installing underfloor heating?

Not automatically. Check your existing certificate and the requirements that apply to your situation. A new assessment may be useful if you need an updated record of the property’s energy performance.

Final Thoughts

Underfloor heating can provide comfortable heating, but its presence does not guarantee a better Energy Performance Certificate rating.

The type of heating system, energy source, insulation, controls and wider building characteristics all matter. Therefore, homeowners should assess the complete installation rather than focusing on one feature.

If you are preparing a London property for sale or rent, check your existing EPC and collect relevant heating-system documents before arranging an assessment.

For further guidance, explore our articles on heat pumps, EPC assessment evidence and EPC recommendations.

If you need an EPC, visit Urgent EPC’s residential assessment service to explore your options.

Disclaimer: This article provides general information and does not guarantee a specific EPC rating, energy saving or property value. Assessment outcomes depend on the property and the applicable methodology. Check current official guidance before making decisions about property compliance or energy improvements.