Solar is required for most new ADUs in St. Helena, Napa County, California under Title 24. Get fixed-price ADU solar packages with transparent pricing.
ADU solar costs in St. Helena typically range from $4,000 to $15,000 depending on system size, panel quality, and financing. With HDM financing, effective costs can be reduced by up to 40% via commercial ITC pass-through.
Most detached ADUs in St. Helena require 4 to 10 panels under California's Title 24 energy code, sized based on conditioned floor area and climate zone 2 efficiency factors.
Under current NEM 3.0 net billing rules, solar self-consumption is more valuable than exporting excess energy. Right-sized ADU solar systems are particularly cost-effective for PG&E customers.