Building an Accessory Dwelling Unit (ADU) is one of the smartest ways to add value, space, and income potential to your property. But before you can start construction, you’ll need to navigate the ADU permit process and understanding each step can save you time, money, and frustration.
- Start with Planning and Zoning
Before applying for a permit, check your local zoning regulations. Each city has its own rules about ADU size, height limits, parking, and setbacks. Confirm that your property qualifies for an ADU whether it’s attached, detached, or a garage conversion and make sure your design meets all local standards. - Prepare Your Plans
Once zoning is approved, you’ll need detailed architectural drawings. These should include floor plans, elevations, site layout, plumbing, and electrical schematics. Many homeowners hire a licensed architect or designer experienced with ADU codes to avoid costly revisions later. - Submit Your Permit Application
Next, submit your ADU plans to your city’s Building and Safety Department. Along with your application, you’ll need supporting documents like energy reports, title documents, and sometimes soil or structural reports. Permit fees vary by city and ADU size. - Plan Review and Corrections
City officials will review your plans for compliance with building codes and zoning laws. Expect to receive comments or required corrections — this is normal. Once you revise and resubmit your plans, final approval will follow. - Inspection and Final Approval
After approval, construction can begin. Inspectors will visit at different stages — foundation, framing, electrical, plumbing, and final inspection. Once your ADU passes all inspections, you’ll receive your Certificate of Occupancy, making it officially ready to use.
With careful planning and patience, your ADU permit journey can go smoothly from application to final approval.
