Key EPC Changes: What the 2025 Update Means for Your Property
The EPC methodology was updated in 2025. Learn what changed, how it affects your rating, and whether you need a new assessment.
By First Certify · 2025-06-20 · 6 min read
First Certify is a UK property compliance platform staffed by accredited assessors and qualified engineers. This article has been reviewed for accuracy against current UK regulations, including MEES, the Electrical Safety Standards 2020, and the Gas Safety (Installation and Use) Regulations 1998.
The Energy Performance Certificate methodology (RdSAP) was updated in 2025, bringing changes to how properties are assessed and rated. If you have an existing EPC, it remains valid for 10 years, but new assessments will use the updated methodology.
The most significant change is the introduction of a new data model that better reflects modern heating systems, including heat pumps and hybrid systems. Properties with renewable heating are likely to see improved ratings under the new methodology, while those with older, inefficient heating systems may see a slight decrease.
Another change is the treatment of smart meters and real-time energy displays. These are now counted as a positive factor in the assessment, reflecting their role in helping households understand and reduce energy consumption.
The updated methodology also changes how thermal bridges (heat loss through junctions between building elements) are calculated. This can affect properties with complex layouts or extensions, potentially moving ratings by a band in either direction.
For landlords, the key takeaway is that if your EPC is nearing expiry, booking a new assessment under the updated methodology may give you a more favourable rating, especially if you have installed renewable heating, smart meters, or improved insulation since your last assessment.
If your property is currently rated F or G under the old methodology and you have made improvements, a new assessment could bring you into compliance with MEES without needing further work. Conversely, if you have not made improvements, the new methodology may reveal a lower rating than expected.
FAQs
Does the 2025 change invalidate my existing EPC?
No. Existing EPCs remain valid for 10 years from the date they were lodged. The updated methodology applies to new assessments only.
Will my rating change under the new methodology?
It may. Properties with renewable heating, smart meters, or improved insulation are likely to see improved ratings. Properties with older heating systems may see a slight decrease. The only way to know is to book a new assessment.
Should I get a new EPC before mine expires?
If you have made energy efficiency improvements, booking a new assessment under the updated methodology could give you a better rating. If your EPC is near expiry you will need one anyway before you can re-let or sell.