For Building Permits related to ADUs in Richmond, you should contact the City’s Building Division at 510-620-6868 or permittechs@ci.richmond.ca.us. The Building Division handles the Building Permit process, including plan checks and inspections, and reviews permits for compliance with the California Building Code. It’s recommended to reach out early to ensure you meet all local requirements and streamline the permitting process. Please note that a Planning Permit is required before submitting a Building Permit. The Planning Division determines that the ADU complies with the development standards for ADUs (Richmond Municipal Code Section 15.04.610.020).