In recent years, Accessory Dwelling Units (ADUs) have gained popularity across California as a practical and affordable solution for expanding living space, housing family members, or generating rental income. As of 2025, new updates to California ADU laws have been introduced, aiming to make the building process more streamlined and accessible for homeowners. If you’re considering building an ADU this year, it’s crucial to stay updated on ADU building regulations 2025 to avoid costly mistakes and delays.