EPC for Modular Homes: What Owners Need to Know
Modular homes and prefabricated properties are becoming an interesting option for people looking for faster construction, modern designs and potentially better energy efficiency.
However, one question often comes up when buying, building or selling a modular property:
How does an EPC work for a modular home?
An Energy Performance Certificate (EPC) provides an energy-efficiency rating from A to G. It also gives information about the property’s energy performance.
For a modular home, the construction method can differ from a traditional brick-built property. Therefore, accurate information about the building materials, insulation, windows, heating and other systems can be particularly useful.
In this guide, we explain what owners and developers should know about an EPC for modular homes in London.
What Is a Modular Home?
A modular home is a property constructed partly or largely from sections manufactured away from the final building site.
These individual modules are then transported to the site and assembled to create the completed building.
Depending on the design, a modular property may use:
Factory-built wall systems
Prefabricated floors
Factory-installed insulation
Modern glazing
Heat pumps
Mechanical ventilation
Solar panels
Other energy-efficient technologies
The exact construction method varies between manufacturers. As a result, the energy characteristics of one modular home can differ significantly from another.
Do Modular Homes Need an EPC?
A modular home can require an EPC in the same way as other residential properties when the relevant EPC rules apply.
For example, an EPC may be required when a property is constructed, sold or rented.
GOV.UK explains that new domestic dwellings in England must have an EPC once construction is completed. The government also specifies approved methodologies for calculating the energy performance of new buildings. (GOV.UK)
Therefore, anyone developing a modular home should consider EPC requirements as part of the wider construction and completion process.
When buying an existing modular property, check whether a valid EPC is already available.
You can use the official GOV.UK Find an Energy Certificate service to search for an existing certificate.
Is an EPC Different for a Modular Home?
The EPC itself still provides an energy-efficiency rating from A to G.
However, the information used to produce the certificate can be particularly important for a modular property.
Modern modular homes may contain construction systems that differ from those found in older traditional properties. For example, the building could have high-performance insulation, advanced glazing or a heat-pump system.
Consequently, having accurate information about these features can make the assessment process easier.
Why Documentation Matters for Modular Properties
One advantage of modular construction is that manufacturers often provide detailed information about the materials and systems used.
For this reason, keep those documents organised after the property has been completed.
Useful records can include:
Wall construction details
Roof construction details
Floor construction details
Insulation specifications
Window information
Door specifications
Heating-system details
Hot-water information
Ventilation specifications
Solar-panel details
Renewable-energy documentation
You may not need every document for an EPC assessment. Nevertheless, accurate records can help establish the property’s actual characteristics.
What Is SAP and Why Does It Matter?
If you are dealing with a new modular dwelling in England, you may come across the term SAP.
SAP stands for Standard Assessment Procedure. It is the government-approved methodology used to calculate the energy performance of new dwellings in England.
The current government methodology uses SAP 10.3 for new dwellings in England, while existing dwellings use the RdSAP10 methodology. (GOV.UK)
The exact process depends on whether you are dealing with a new construction, an existing property or another type of project.
As a homeowner, you do not need to perform these calculations yourself. Instead, make sure the appropriate assessment and certification process is completed for the property.
Can a Modular Home Get a High EPC Rating?
It can, but modular construction does not automatically guarantee a particular EPC rating.
The final rating depends on the characteristics of the building and the assessment.
Factors can include:
Insulation
Heating system
Hot-water system
Windows
Doors
Lighting
Ventilation
Renewable technologies
Building construction
Heating controls
A well-designed modular home may include several energy-efficient features. Even so, the EPC rating should reflect the property’s actual characteristics.
What If the Modular Home Uses Unusual Materials?
Some modular homes use construction systems or materials that are less common than those found in traditional properties.
In that situation, good documentation becomes especially useful.
For example, if the walls use a specialist panel system, keep the manufacturer’s technical information. Similarly, retain relevant information about unusual insulation or glazing systems.
Useful documentation might include:
Product specifications
Insulation values
Construction details
Manufacturer documentation
Installation records
Certification
Building-control information
Do not assume that an assessor will automatically know the exact specification of a specialist construction system.
Instead, provide relevant documentation when it is available.
What If the EPC Rating Seems Lower Than Expected?
A modular home may be designed to be highly energy efficient. Therefore, an unexpectedly low EPC rating can be frustrating.
However, do not immediately assume that the EPC is incorrect.
Start by checking the information recorded on the certificate.
Look at:
Property address
Floor area
Construction details
Heating system
Hot-water system
Windows
Insulation
Renewable technologies
Certificate date
Recommendations
If something appears incorrect, gather supporting documentation before taking further action.
For example, you may have installation records, manufacturer specifications or certificates that help demonstrate the property’s actual features.
You can also read our recent guide What to Do If Your EPC Rating Seems Wrong for practical steps to take when an EPC does not appear to reflect the property accurately.
Can Solar Panels Improve a Modular Home’s EPC?
Solar panels can form part of the energy characteristics considered during an EPC assessment.
However, installing solar panels does not guarantee a particular EPC rating.
Instead, the assessment considers the property’s relevant energy characteristics as a whole.
If your modular home has solar panels, keep the installation information available.
Useful documents can include:
Solar-panel specifications
Installation documents
System details
Inverter information
Certification
Relevant technical documentation
The same principle applies to other renewable-energy systems.
What About Heat Pumps?
Many modern modular homes use heat pumps or other low-carbon heating systems.
If your property has a heat pump, keep the relevant documentation. This information can help establish the heating system installed at the property.
Useful records may include:
Manufacturer details
Model information
Installation documentation
Controls
Heating-system specifications
Commissioning information
The heating system is an important part of a property’s energy characteristics.
Furthermore, the government’s current Approved Document L guidance includes requirements relating to low-carbon heating systems, heat-pump controls and building services. (GOV.UK)
For a specific new-build project, always follow the applicable building regulations and professional advice.
What Should You Do Before an EPC Assessment?
If you need an EPC for an existing modular property, prepare the home before the assessor arrives.
1. Make the property accessible
First, make sure the assessor can access the rooms, heating equipment and relevant areas required for the assessment.
2. Gather technical information
Next, keep documentation for unusual construction materials, insulation and energy systems available.
3. Prepare heating information
Also, have details of the boiler, heat pump or other heating system ready.
4. Keep insulation records
If detailed insulation information is available, keep it nearby for reference.
5. Mention recent improvements
In addition, tell the assessor about relevant improvements or changes made to the property.
6. Keep renewable-energy information
Finally, if the property has solar panels or another renewable technology, keep the relevant documentation available.
For more general preparation advice, see our guide How to Prepare for an EPC Assessment in London.
What If You Are Selling a Modular Home?
If you are preparing to sell an existing modular home, check the EPC early.
First, find the current certificate. Then check:
Property address
EPC rating
Certificate date
Expiry date
Property details
Recent improvements
GOV.UK guidance states that where an EPC is required, it should generally be commissioned before a property is put on the market. (GOV.UK)
Consequently, dealing with the EPC early can help avoid unnecessary delays when the estate agent is ready to launch the listing.
Can an EPC Affect How a Modular Home Is Presented?
An EPC does not determine the market value of a property.
Nevertheless, energy-performance information can form part of the information buyers consider when comparing homes.
Our recent article Can an EPC Rating Affect Your Property Value? explains the relationship between EPC information and property value in more detail.
For a modular home with modern energy-efficient features, accurate EPC information can therefore be useful when preparing the property for sale.
Do Not Forget the Rest of the Property Listing
An EPC is only one part of preparing a property for the market.
You may also need:
Professional photography
A floor plan
Accurate room information
A property description
Current property measurements
Details of improvements
This is particularly important for modular properties because their layouts can sometimes differ from traditional homes.
A floor plan can help buyers understand the layout. Meanwhile, professional photography can show the property’s construction, finishes and presentation.
Our recent guide Property Photography for Estate Agents: How to Prepare a Property for a Professional Shoot explains how to prepare a property before photography.
Urgent EPC also provides professional property photography and property floor plan services alongside EPC services.
Modular Home EPC Checklist
If you own or are preparing a modular property, use this checklist.
Property Information
Check whether an EPC already exists
Confirm the property address
Check the certificate date
Check the expiry date
Review the current EPC rating
Construction Documents
Keep wall specifications
Keep roof specifications
Keep floor specifications
Keep insulation information
Keep window specifications
Keep manufacturer documentation
Energy Systems
Record the heating system
Keep heat-pump documentation if applicable
Keep boiler information if applicable
Keep solar-panel information
Keep ventilation-system information
Keep heating-control details
Before Selling or Renting
Check whether the EPC is valid
Review recent property changes
Arrange a new assessment if required
Prepare photography
Arrange a floor plan
Check that the property listing matches the current property
Frequently Asked Questions
Do modular homes need an EPC?
A modular home can require an EPC when the relevant EPC rules apply, including circumstances involving new construction, sale or rental. Check the current GOV.UK requirements for your property.
Can a modular home have an A-rated EPC?
Yes, a modular property can achieve a high EPC rating. However, the final rating depends on the property’s construction, heating, insulation and other relevant characteristics.
What documents should I keep for a modular home EPC?
Keep construction specifications, insulation information, window details, heating-system documents, renewable-energy information and other relevant technical records.
Does modular construction automatically improve an EPC rating?
No. The construction method itself does not guarantee a particular EPC rating. Instead, the rating depends on the relevant characteristics recorded during the assessment.
Do solar panels guarantee a better EPC rating?
No. Solar panels can be relevant to an EPC assessment, but the final rating depends on the property as a whole.
What if my modular home’s EPC rating seems wrong?
First, check the property information recorded on the certificate. If you identify a possible error, gather supporting documents and discuss the issue with the relevant assessor.
You can also read our guide on what to do if your EPC rating seems wrong.
Can I get an EPC for a modular home in London?
If your modular property requires an EPC, you can arrange an assessment with an appropriately accredited assessor.
Urgent EPC provides residential EPC services across London.
Final Thoughts
An EPC for modular homes follows the same overall purpose as an EPC for other residential properties. However, accurate technical information can be particularly valuable when the property uses non-traditional construction methods.
Therefore, modular-home owners should keep construction and energy-system documentation organised.
If you are building a new modular dwelling, consider EPC and energy-performance requirements from the beginning of the project.
Similarly, if you are selling or renting an existing modular property, check the current EPC before marketing it.
For the latest regulatory information, always refer to the relevant GOV.UK EPC guidance and current Approved Document L guidance.
If you need an EPC for a modular or other residential property in London, you can explore Urgent EPC’s residential EPC service or contact the team to discuss your requirements.
