Energy Performance Certificates (EPCs) are a regular talking point in property, and with good reason.
Their accuracy matters - not just for compliance, but for helping you make informed decisions about your property.
This year, the government has introduced a new and improved methodology for EPCs, aiming to give a more precise picture of energy efficiency for every home.
What's new with EPCs?
From 15 June 2025, EPC assessors will collect more detailed information and may ask for supporting documents, like insulation certificates or boiler records.
The process is designed to be more thorough, so you can expect a slightly longer visit and potentially a higher fee than in previous years.
For most homes, the assessment itself should still be straightforward - often taking around 10 minutes, depending on the size and complexity of the property.
However, with rising business costs, it’s worth checking what you should budget for your next EPC.
What’s changing in the assessment?
Here are the main updates you’ll notice:
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Assessors will now pay closer attention to where heat escapes, including chimneys, flues, and extractor fans.
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Roof insulation will be checked in more detail, with better assumptions made about its effectiveness.
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Wall areas will be measured more accurately, accounting for windows and insulation, and including updated data for solid brick and stone walls.
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Window measurements are more precise and shutters, insulated or not, will be included in the assessment.
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Floor insulation and ventilation will be considered more carefully.
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New technologies, such as home batteries and solar PV diverters (which use solar panels to heat water), are now part of the calculation.
These changes are designed to make EPC ratings more accurate and the recommendations more useful, especially when it comes to understanding how much you could save by improving your property’s energy efficiency.
Why does this matter?
This is the first major update to EPCs in a decade, and it’s a response to the pace of change in home technology and government regulations.
As the drive for energy efficiency continues, and with new rules on the horizon, EPCs will play a bigger role in buying, selling, and letting property.
Andrew Parkin
Chair - Property Energy Professionals Association
EPCs remain valid for 10 years, but with these changes, it’s a good time to check your property’s current rating and see where improvements could be made.
Looking ahead, it’s likely that minimum EPC requirements will rise to a C rating or above. With the average property in England currently rated at D, now is the time to review your property’s energy performance or check if you qualify for an exemption.
The Reeds Rains Content Marketing Team
