California’s energy compliance process is changing. Builders, energy raters, and consultants need to understand two important updates that affect how homes are verified and documented. The goal of these changes is to improve confidence in energy compliance test results and create more consistency across projects.

The Shift from HERS to ECC

Beginning January 1, 2026, California moved field verification and diagnostic testing from the traditional HERS framework into the new Energy Code Compliance (ECC) Program under Title 24, Part 1.

For builders, the biggest visible change is terminology:

• HERS Providers are now recognized as ECC-Providers.
• HERS Raters are now recognized as ECC-Raters.
• 2025 Energy Code documents and registries will use ECC terminology.

The previous HERS Program is still active, but its focus is now primarily on whole-house ratings and home energy audits.

For the 2025 Energy Code cycle, providers must receive separate approval from the California Energy Commission. CHEERS received ECC-Provider approval on November 12, 2025.

What CHEERS Will Be Watching

Two areas will continue to receive close attention during quality assurance reviews.

1. Consistent and Accurate Data

Submissions may receive additional review when information does not match expected results, including:

• Test results that conflict with previous submissions
• Field verification that does not match project documentation
• Performance results outside expected ranges

Accurate documentation and consistent field practices help prevent delays.

2. Sampling Quality

California allows certain energy measures to be verified through sampling rather than testing every home.

Sampling works only when construction practices are consistent across the community. Builders should expect continued quality checks to confirm that sampled homes accurately represent the larger project.

What This Means for Builders

Builders with consistent construction practices and accurate documentation will experience fewer review issues and smoother approvals.

Transition Impact

Working with experienced third-party providers and maintaining strong construction quality practices can help builders avoid delays, reduce compliance risk, and make the ECC transition smoother.

Learn how ARCXIS can support your California projects at: https://arcxis.com/markets