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Climate Zones 8, 9 & 10: lower-SHGC windows now required
Southern California's coastal-inland band — the LA basin, Orange County, and the near Inland Empire — now needs solar-control glazing, with a cooling bump on the High-Performance option in CZ10. Here's what to spec.
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Climate Zone 12: stricter glazing and cooling requirements
Projects in the Sacramento Valley and foothills now need lower solar-heat-gain windows and higher-efficiency cooling to stay compliant. We updated our baseline automatically — here's what to spec.
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When solar (PV) is required — and when additions and ADUs are exempt
New homes need a solar array; additions, alterations, and attached ADUs don't. Here's how to tell which bucket your project is in before you size a system.
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