Energy Code Compliance (ECC) — Title 24 Verification Services
What Is Energy Code Compliance (ECC)?
Beginning January 1, 2026, California’s building energy code compliance verification previously performed under the Home Energy Rating System (HERS) has transitioned into the Energy Code Compliance (ECC) Program as part of the 2025 edition of Title 24, California’s Building Energy Efficiency Standards.
Under the ECC Program, the process of field verification and diagnostic testing (formerly called HERS FV/DT) is now integrated directly into Energy Code requirements. ECC ensures that specific installed energy-efficiency measures meet code-required performance for new construction, additions, and alterations.
ECC-Raters are certified professionals who conduct field verification and diagnostic testing to demonstrate that energy-related building components meet Title 24 requirements. Existing HERS raters will be recognized as ECC-Raters under the new program for applicable projects, provided they complete required training and certification updates.
What Changed From HERS to ECC
The Energy Code has transitioned compliance verification terminology from HERS Rater to ECC Rater to better reflect the program’s purpose code compliance.
What stayed the same:
- Field verification and diagnostic testing requirements
- Certified third-party verification
- Registry-based documentation
What changed:
- Updated terminology (ECC instead of HERS)
- Direct integration into Title 24 Energy Code language
- Updated training and certification requirements
Projects That Commonly Require ECC
- New residential construction
- HVAC system replacements
- Alterations and additions
- Duct sealing and leakage testing
- Refrigerant charge verification
- Mechanical ventilation verification
What Changed From HERS to ECC
At ELEM3NTS, we understand the evolving regulatory landscape for energy compliance in California. Our team works with certified ECC-Raters and contractors to:
- Ensure accurate field verification and diagnostic testing.
- Provide timely documentation for building permits.
- Help contractors and builders navigate ECC requirements with minimal delays.
Whether you’re building new construction, renovating, or completing additions, we ensure your project meets the 2025 Energy Code compliance expectations.