Every newly constructed detached ADU in Yolo County, California must include a Title 24-compliant solar PV system. Yolo County spans climate zone 12, which determines exactly how many kilowatts your specific project must install for code compliance.
Local building departments across Yolo County enforce Title 24 at plan check. Plans submitted without a properly sized solar system are routinely rejected unless a documented exemption (shading, roof area, structural) applies.
Yolo County's UC Davis campus drives rental demand in Davis and Woodland. Valley Clean Energy provides community choice options complementing solar installations.
Title 24 multiplies your ADU's conditioned floor area by a climate-zone-specific kW factor. Across Yolo County's climate zone 12, most ADUs land in the 1.6–4.0 kW range — typically 4 to 10 modern (~400W) panels.
Title 24-compliant ADU solar packages range from $4,000 (Standard cash) to $15,000+ (Premium with battery) across Yolo County. HDM financing typically reduces effective cost by ~40% via commercial ITC pass-through. Main utilities serving the county: PG&E, Valley Clean Energy.
Yes. Title 24 is California state law and every jurisdiction in Yolo County enforces it at permit submittal.
Yolo County sits in climate zone 12. Use our cost calculator to map your exact ZIP code to its Title 24 climate zone.
Exemptions are project-specific, not countywide. The most common are shading (<70% annual solar access), insufficient roof area, and structural infeasibility. Your designer documents these on the CF1R compliance form.