Smart Thermostats and EPC Ratings in London: What Homeowners Should Know
Smart thermostats give homeowners more control over their heating. They can help manage temperatures, create heating schedules and reduce unnecessary heating. However, if you are selling or renting a London property, you may wonder whether a smart thermostat can improve your Energy Performance Certificate (EPC) rating.
The answer depends on the heating system, the controls installed and the property’s overall energy performance. A smart thermostat does not automatically guarantee a higher EPC rating.
In this guide, we explain how smart heating controls relate to EPC assessments, what property owners should check and how to prepare for an assessment.
What Is a Smart Thermostat?
A smart thermostat is a device that allows you to control your heating more conveniently. Depending on the model, it may connect to a mobile application, follow a heating schedule or adjust temperatures using information about occupancy and room conditions.
Some systems work with gas boilers, while others are designed for compatible electric heating systems or heat pumps.
Common features include:
Programmable heating schedules
Remote temperature control
Automatic temperature adjustments
Integration with compatible heating systems
Energy-use monitoring on supported devices
These features can help households manage heating more effectively. Nevertheless, actual energy savings depend on how the system is installed, configured and used.
Do Smart Thermostats Improve EPC Ratings?
Smart thermostats can be relevant to the heating controls installed in a property. However, fitting one does not automatically improve the EPC rating.
An Energy Performance Certificate assesses a property’s energy performance using the applicable assessment methodology. Relevant information can include the heating system, heating controls, insulation, windows, hot water and other building characteristics.
For example, a property with a suitable boiler and effective heating controls may be assessed differently from a similar property with less effective controls. The final result depends on the details recorded and how they are treated by the assessment methodology.
If you want to understand the wider factors behind your certificate, read our guide to EPC recommendations for London properties.
Reviewing those recommendations can help you identify which improvements may be worth investigating before spending money on new equipment.
How Do Smart Heating Controls Work?
Smart thermostats help manage when and how a heating system operates. Their features vary, so it is important to understand what your particular system can do.
1. Programmable Heating Schedules
First, many smart thermostats allow you to set different temperatures for different times of the day.
For example, you might reduce the heating temperature when the property is empty and schedule it to return to a comfortable level before you arrive home.
This can help avoid heating the property unnecessarily.
2. Remote Temperature Control
Some systems let you adjust the heating from a smartphone.
This feature can be useful if your plans change or you want to check the heating while away from home. However, remote access alone does not determine the property’s EPC rating.
3. Room-by-Room Temperature Management
Certain systems support multiple room sensors or smart radiator controls.
These features can provide more detailed temperature management, depending on compatibility with the existing heating system.
The equipment installed and its recognised function matter more than the marketing label attached to it.
4. Integration With Heat Pumps
Some smart controls are designed to work with heat pumps. Compatibility is important because heat pumps can operate differently from conventional boilers.
If your London property uses this technology, read our article on EPC assessments for heat pumps in London.
The correct controls and system configuration can support efficient operation, but an EPC outcome still depends on the property as a whole.
What Will an EPC Assessor Check?
During an EPC assessment, the assessor gathers information about the property’s construction and energy-related features. Heating controls may be relevant, depending on the system installed and the applicable methodology.
If you have recently installed a smart thermostat, make sure the assessor can identify the relevant heating equipment and controls.
It is useful to know:
Which heating system the thermostat controls
Whether the thermostat is programmable
Whether separate room controls are installed
Whether the controls work with a boiler or heat pump
Whether the heating system has been changed recently
You should provide accurate information rather than assume that every smart feature will receive additional credit.
Our guide to EPC assessment evidence for London property owners explains why supporting documents can be useful during an assessment.
What Documents Should You Keep?
If you have upgraded your heating controls, keep any relevant documentation available.
Heating Control Information
Retain the thermostat’s model details, user manual and installation information where possible. These records can help identify the equipment and its intended function.
Boiler or Heat Pump Records
If the smart thermostat was installed alongside a new boiler or heat pump, keep the relevant invoices and technical documents.
This is particularly useful when several improvements have been made since the previous EPC assessment.
Installation Receipts
An installation receipt can help establish when the controls were fitted. It may also help you distinguish the new equipment from the system recorded on an older certificate.
Previous EPC Certificate
Keep your existing EPC so you can compare the recorded property details and recommendations with the current condition of your home.
You can also use the official GOV.UK Find an Energy Certificate service to check whether a certificate is available for your property.
You do not necessarily need every document listed above. The assessor will determine which information is relevant to the assessment.
Smart Thermostats, Insulation and Heating Efficiency
Heating controls are only one part of a property’s energy performance.
A smart thermostat cannot compensate for every issue associated with poor insulation, heat loss or an inefficient heating system. Therefore, consider the wider condition of the property before deciding which improvements to make.
For example, an older London house may have limited loft insulation, while a flat may have different construction characteristics and heating arrangements.
Before investing in new controls, review the recommendations on your existing EPC. You may find that insulation, heating upgrades or other measures deserve attention first.
If your home has recently undergone improvements, our guide to what happens when a property changes after its last EPC can help you understand what to check.
Remember that not every home improvement requires a new EPC. Consider a new assessment when it is needed for your circumstances or when you want an updated record of the property’s energy performance.
What About Smart Thermostats in London Flats?
London flats can have different heating arrangements. Some use individual boilers, while others rely on communal heating or other shared systems.
Consequently, not every smart thermostat is suitable for every flat.
Before installing one, check whether the device is compatible with your existing heating system. If your flat uses communal heating, you may also need to understand which controls are available to you and which systems are managed by the building.
For more information about flat-specific considerations, read our guide to EPC requirements for flats in London.
If the property has shared heating, gather any available information about the system before your assessment. This can help clarify the equipment serving your flat.
Should You Install a Smart Thermostat Before Selling or Renting?
Installing a smart thermostat solely to increase an EPC rating may not be the best first step.
Instead, consider these questions before making a decision.
Is your existing heating control working properly?
If the current control is faulty or unsuitable, replacing it may improve your ability to manage heating. However, the EPC impact depends on the actual equipment and assessment methodology.
Does your heating system support the new thermostat?
Check compatibility before purchasing a device. Some systems require specific controls, wiring or professional installation.
What does your existing EPC recommend?
Review the recommendations to understand the improvements identified for your property. A different measure may be more appropriate for your circumstances.
Are you preparing the property for marketing?
If you plan to sell or rent the property, check your EPC early. You can read the official GOV.UK guidance on Energy Performance Certificates when selling a home to understand the general requirements.
For additional preparation advice, see our guide to EPC requirements before selling or renting a London property.
How to Prepare for an EPC Assessment
If you have smart heating controls, a few simple steps can help you prepare for your appointment.
Check your existing EPC. Confirm the property details and review the recommendations.
Identify the heating system. Know whether the property uses a boiler, heat pump, electric heating or a communal system.
Gather equipment information. Keep manuals, installation records and relevant specifications available.
Explain recent changes. Tell the assessor about new heating controls or other energy-related improvements.
Provide access. Make sure the assessor can reach the relevant rooms and heating equipment.
For a more detailed checklist, read our guide to preparing for an EPC assessment in London.
If you are preparing an empty property for sale or rent, our article on EPCs for empty properties in London provides further guidance on the issues owners should check.
Do You Need a New EPC After Installing a Smart Thermostat?
Not necessarily. Installing a smart thermostat does not automatically require a new Energy Performance Certificate.
An EPC is generally valid for ten years, although a newer certificate can replace an earlier one. Whether you need a new assessment depends on your circumstances and the applicable requirements.
If you are preparing a property for sale or rent, check whether a valid certificate already exists before arranging another assessment.
Where an updated certificate is appropriate, an accredited energy assessor can assess the property’s current characteristics under the applicable methodology.
Arrange an EPC Assessment in London
If you are selling or renting your property, checking the EPC early can help you prepare the required documentation and avoid unnecessary delays.
Urgent EPC provides residential EPC services in London for homeowners and landlords. If you need an appointment quickly, you can also enquire about the available same-day EPC service.
Before booking, check whether an existing certificate is valid and gather information about any relevant heating upgrades.
This preparation helps you understand your property’s current energy performance and make informed decisions about possible improvements.
Frequently Asked Questions
Can a smart thermostat increase an EPC rating?
It may be relevant to the heating controls considered during an EPC assessment, but it does not guarantee a higher rating. The result depends on the installed system and the applicable assessment methodology.
Does a smart thermostat reduce energy bills?
It can help manage heating schedules and temperatures. Actual savings depend on the property, the heating system, household behaviour and energy tariffs.
Do smart thermostats work with all boilers?
No. Compatibility varies by thermostat and heating system. Check the manufacturer’s requirements or seek professional advice before installation.
Should I install a smart thermostat before an EPC assessment?
You do not need to install one solely for the assessment. Review your existing EPC recommendations and consider whether the upgrade suits your heating system and circumstances.
Do I need a new EPC after changing my heating controls?
Not automatically. Check whether your existing certificate remains valid and whether a new assessment is necessary for your circumstances.
Final Thoughts
Smart thermostats can make heating easier to manage, but their presence does not automatically improve an EPC rating.
The most useful approach is to understand your current heating system, review the recommendations on your EPC and keep records of relevant improvements.
If you are preparing to sell or rent a London property, check your certificate early and seek advice from an accredited assessor when you need an updated assessment.
By understanding how heating controls fit into the wider energy assessment, you can make better-informed decisions about your property.
