Can EPC Rating Go Down?

Yes, an EPC (Energy Performance Certificate) rating can go down over time. Here’s why:

🔻 Why Your EPC Rating Might Decrease:

1. Changes in Assessment Standards
   Updates to EPC calculation methods (like the 2025 RdSAP 10 reform) require stricter evidence and remove assumptions—leading to lower scores if documentation is missing.

2. Property Deterioration
   If insulation degrades, heating systems age, or windows become drafty, your energy efficiency drops—impacting your EPC rating.

3. Energy System Downgrades
   Replacing efficient systems with less efficient ones (e.g., removing solar panels or switching from a modern boiler to an older one) can reduce your EPC score.

4. Lack of Upgrades
   A home that hasn’t been improved over 10+ years may rank worse under modern standards, especially if other homes are getting smarter and more efficient.

📉 Real-World Example:

If your property was rated C a decade ago with assumptions like “cavity wall insulation,” but today you can’t provide proof, a new assessment may downgrade it to D or E—even without any changes to the property.

✅ How to Prevent a Lower EPC Rating:

• Keep evidence of insulation, boiler upgrades, smart meters, and renewable tech.

• Regularly update heating, lighting, and glazing.

• Book a residential EPC with certified assessors who can offer upgrade guidance.

• For urgent updates, use our same-day EPC service.

📞 Need help? Call +44 7741 812 864 or visit our Contact Page.
Our London-based team ensures you’re prepared for every EPC update.