2026 HVAC Codes Are Now Effective
California’s 2025 Title 24 Building Codes took effect January 1, 2026, bringing important changes for HVAC and sheet metal contractors statewide. These updates directly impact system design, installation, testing and documentation — making code compliance essential to protecting your business and keeping projects on track.
Here’s what contractors should keep top-of-mind in 2026:
• Energy Code Updates – Title 24 changes impact mechanical system design and efficiency testing.
• Duct & Mechanical Testing – UMC updates align with SMACNA’s SALT and TAB manuals.
• Fire & Smoke Safety – NFPA 80, 90, 105, 204 updates affect damper inspections.
• Acceptance Testing (ATTCP) – New certification and documentation requirements.
• Indoor Air Quality – ASHRAE standards + state legislation affect ventilation and filtration.
• SMACNA Standards – Ensure you’re using the latest editions for fabrication, installation, and testing.
Bottom line: Codes are live. Review your processes now to stay compliant, avoid rework and protect your projects!
*As of the time of publication, members should have received an email from CAL SMACNA with additional details. Contact Emily Mills at emily@cal-smacna.org with questions.