Costa Mesa, CA Solar Energy: Panel Permits (2026)

Costa Mesa has adopted an expedited, streamlined solar permitting process that complies with the Solar Rights Act and AB 2188 to encourage solar adoption. A small residential solar energy system is defined as one not larger than 10 kilowatts alternating current nameplate rating or 30 kilowatts thermal, installed on a single-family or duplex dwelling. Permits are submitted through the Costa Mesa Building Division via the online TESSA portal. Electronic submittal of permit applications and documents is available to all small residential rooftop solar energy system applicants. Applications complying with AB 2188 residential solar guidelines qualify for expedited processing, with the permit and documentation phase typically taking 7 to 21 days for straightforward projects. The solar panel or module array must not exceed the maximum legal building height as defined by the city's zoning code. The system must conform to all applicable state fire, structural, electrical, and other building codes as adopted or amended by Costa Mesa and all State of California health and safety standards. Properties within the California Coastal Zone may require a Coastal Development Permit from the California Coastal Commission, which can extend timelines to 3 to 6 months and add additional permit fees.