CA SB543

Revises the definition of "junior accessory dwelling unit" (JADU) to specify a maximum of 500 square feet of "interior livable space" rather than just 500 square feet in size

Requires local agencies to submit JADU ordinances to the Department of Housing and Community Development within 60 days of adoption for compliance review; non-compliant ordinances that aren't corrected become null and void

Mandates permitting agencies determine whether ADU or JADU applications are complete within 15 business days and provide written notice; incomplete applications must include a list of deficiencies and applicants must be given an appeals process with a 60-business-day deadline for final determination

Prohibits impact fees on ADUs with 750 square feet or less of interior livable space and JADUs with 500 square feet or less; ADUs and JADUs under 500 square feet of interior livable space are exempt from school facility fees

Extends existing ADU protections to JADUs, including prohibition on requiring fire sprinklers if not required for the primary residence, and requires ministerial approval of combined ADU and JADU applications