ADU Construction Trends: How California's Policy Shifts Are Reshaping Residential Density

California has gradually reformed rules to increase residential density, notably through accessory dwelling units (ADUs). Since 2016, state laws have limited local restrictions on ADUs, boosting permits significantly, especially in high-cost areas like San Diego. Challenges remain, including utility capacity, parking, neighborhood opposition, and financing gaps. ADU construction is now a lasting sector requiring specialized local regulatory knowledge, with further state legislation expected.