Every newly constructed detached ADU in Monterey County, California must include a Title 24-compliant solar PV system. Monterey County spans climate zones 3, 4, which determines exactly how many kilowatts your specific project must install for code compliance.
Local building departments across Monterey 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.
Monterey County spans from the foggy coast to the sunny Salinas Valley. Inland communities enjoy strong solar production, and ADU construction is growing as housing prices rise.
Title 24 multiplies your ADU's conditioned floor area by a climate-zone-specific kW factor. Across Monterey County's climate zones 3, 4, 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 Monterey County. HDM financing typically reduces effective cost by ~40% via commercial ITC pass-through. Main utilities serving the county: PG&E.
Yes. Title 24 is California state law and every jurisdiction in Monterey County enforces it at permit submittal.
Monterey County sits in climate zones 3, 4. 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.