Title 24 Solar Requirements for New Homes
Title 24 Solar Requirements for New Homes
Since 2020, California has required solar photovoltaic systems on most new residential construction. This mandate, part of the Title 24 Building Energy Efficiency Standards, makes California the first state in the nation to require solar on new homes.
What Does the Solar Mandate Require?
The Title 24 solar requirement applies to all new single-family homes, duplexes, and low-rise multifamily buildings (three stories or fewer). The minimum system size is calculated based on the home's conditioned floor area and climate zone. For a typical single-family home, this usually means a 2-4 kW system.
Are There Exceptions?
Yes. Homes with significant roof shading from existing structures or trees may qualify for a reduction or exemption. Properties where the annual solar access is less than 80 percent of optimal can also receive adjustments. Additionally, homes in certain climate zones with community shared solar programs may use off-site solar to meet the requirement.
How Is Solar Compliance Verified?
Solar compliance is documented on the CF1R energy compliance report and verified through building department plan review. The installed system must match or exceed the specifications in the compliance documents. Final inspection confirms the system is installed and operational before certificate of occupancy is issued.