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California's Updated Energy Code Now in Effect for Curtain Wall and Window Projects
time2026/08/14
- California's 2025 Title 24 energy code is now in effect, raising U-factor and SHGC requirements for curtain wall and window systems. Here's what it means for your project.
California's 2025 Building Energy Efficiency Standards (Title 24, Part 6) officially took effect on January 1, 2026, bringing tighter energy performance requirements for windows, fixed glazing, and curtain wall systems used in new construction, additions, and alterations across the state.
The updated code includes revised U-factor and Solar Heat Gain Coefficient (SHGC) requirements for nonresidential fenestration, including curtain wall and fixed window assemblies, with specific performance targets varying by climate zone. For architects, contractors, and developers working on California projects, this means fenestration systems now need to meet stricter thermal performance benchmarks to pass plan review and inspection.
For manufacturers supplying the California market, the update reinforces a trend that's been building across North America for several years: energy codes are getting stricter, and curtain wall and window systems are under increasing scrutiny as key contributors to a building's overall energy performance.
At FOWALL, we track code updates like this across the markets we serve, so our product specifications and certifications stay aligned with what our North American partners need for compliance. We're glad to help clients confirm whether a given system meets the performance requirements for their project's location — reach out to our team with your project details and climate zone, and we can walk through what's needed.
We'll continue sharing brief updates like this as codes evolve across the states and provinces we work in. For a deeper look at how U-factor and SHGC affect curtain wall performance, keep an eye on our Blog for upcoming articles.