Pre-Approved Plans
Find your dream ADU design
Save time and money by choosing an existing set of plans and connecting directly with the architect, designer, or company. Plus, some locations have already reviewed plans for building code compliance, saving you even more time in the permitting process!
PLEASE NOTE: All existing ADU designs – even pre-approved plans – require planning for your property and other permit applications. You most likely need to hire a professional to complete this work. Not all designs work on all properties, so ask a professional before purchasing or using a design.
ADU Plans Galleries
As of September 2024, some Napa and Sonoma locations are getting ready to launch their own individual ADU Plans Galleries, offering a selection of site-built and/or prefabricated ADU designs.
Until then, you can:
- Continue using the Napa Sonoma Standard Plans Gallery, or
- browse the new statewide gallery to see the program’s entire selection of plans. (This gallery does not include any locally pre-approved plans, but all prefabricated plans show as pre-approved since they have state or federal approval.)
Ask local staff
As of January 1, 2025, all local governments in California are required to accept ADU plans for pre-approval and keep a list of locally pre-approved plans online so homeowners can get in touch with the designers to purchase or use the plans.
Use our Contact page to find contact information for your local staff and ask about locally pre-approved plans.
