A Certificate of Occupancy (C of O) is a document issued by Building and Safety which certifies that a commercial space or newly constructed residential building has been inspected for compliance with the California Building Standards Code and local ordinances which govern construction and occupancy.
What normally requires a Certificate of Occupancy?
New Residential Structures and their accessory structures
Residential conversions (i.e. ADU’s, non-habitable space converted to habitable space)
New Commercial Structures
Commercial tenant improvements that require a building permit showing any change in area, occupancy, or use.
The California Building Code states that all businesses shall have a valid Certificate of Occupancy [CBC Section 111, CRC R110].
More information regarding C of O's can be found in the C of O and Temporary C of O handout.