1. Major Methodology Update – RdSAP 10 (June 15, 2025)
The RdSAP 10 update replaces the current EPC calculation system for existing homes. It requires assessors to gather more evidence—such as glazing types, heating system model numbers, and smart controls—instead of relying on defaults.
This makes EPC ratings more accurate and harder to influence without proper documentation. Missing evidence can even lower a property’s rating despite upgrades.
Result: Higher upfront assessment costs, but more reliable reports for buyers, tenants, landlords, and investors .
2. Introduction of the Home Energy Model (HEM) – From H2 2026
In 2026, EPCs will transition from SAP/RdSAP to the new Home Energy Model (HEM)—a more holistic system that factors in:
Fabric performance
Heating efficiency
Energy costs
Carbon emissions
Smart energy readiness.
These reforms aim to support the UK’s net-zero goals and improve real-world accuracy of EPCs.
3. Evolving Minimum Energy Efficiency Standards (MEES)
Alongside EPC reforms, the government is updating MEES, with proposals to:
Raise the minimum EPC requirement from E to C for new tenancies (from 2028) and all tenancies (by 2030)
Cap landlord improvement costs at £15,000 per property, with possible exemptions .
These reforms support efforts like the Labour proposal to achieve EPC C by 2030 .
📅 Summary Table
| Reform | Date Effective | Key Changes | |
|---|---|---|---|
| RdSAP 10 rollout | 15 Jun 2025 | More accurate data collection; higher costs | |
| HEM introduction | Second half of 2026 | New multi-metric system; net-zero aligned | |
| Minimum EPC C required | New lets 2028, all lets 2030 |
|
Why It Matters
Your current EPC methodology will expire and be replaced—requiring you to commission a new, more detailed EPC after June 2025.
Upgrading fabric, heating systems, and smart controls before assessments are advised, as missing documentation could reduce ratings.
Landlords face stricter standards and may need to plan upgrades now to meet future requirements.
✅ How Urgent EPC Supports You
Our Same-Day EPC service moves swiftly to get your new compliant report.
We help interpret new standards and advise on improvements via our Residential EPC expertise.
Reach out to our expert assessors today:
📞 +44 7741 812 864✉️info@samedayepc.co.uk | 🔗 Contact Us
