Starting at the beginning of 2020, the state of California now requires new single-family homes and multi-family homes up to three stories to install solar photovoltaic (PV) systems.
This requirement is part of the California’s 2019 Building Energy Efficiency Standards. On December 5, 2018 the California Building Standards Commission will meet to review the standards. The current version of the new standards, which also ramp up energy efficiency requirements for buildings, are expected to save the average homeowner around $19,000 over 30 years—double what the standards are expected to add to the cost of a new home. From 2020 to 2023, the standards are expected to reduce greenhouse gas emissions equivalent to taking 115,000 cars off the road.