ADU Regulations and Eligibility across San Diego County
Before choosing a floor plan, ask the reviewing agency whether the proposed use and existing structure fit an ADU or junior ADU path. The answer depends on the property and current requirements, so a neighboring project is not a reliable substitute for an address-specific review.
What to know
- In the City of San Diego, the ADU bulletin describes an ADU as an attached or detached dwelling with independent living, sleeping, cooking, and sanitation facilities.
- The City describes a junior ADU within a single dwelling or attached garage; it needs a kitchen or efficiency kitchen and may share sanitation with the home.
- The City bulletin lists allowable locations by zone and distinguishes existing single-dwelling and multiple-dwelling properties; confirm the applicable category for the address.
- Identify whether the garage is attached to the home or stands separately.
- Describe the proposed entry, cooking facilities, bathroom, and intended use.
- Ask about the existing structure, property constraints, and any applicable local review.
- Discuss parking, utilities, and access with the agency and the project professional.
- Confirm any occupancy, rental, or recorded-document requirements before relying on the unit for income.
Official resources
Common questions
Does every garage qualify for an ADU?
Do not assume eligibility from the garage alone. Ask the agency that reviews the property and a qualified professional to evaluate the proposed project.
Should I choose an ADU or a junior ADU first?
Explain how you want the space to function, whether the garage is attached, and what facilities you want. The agency and your designer can help identify the applicable path.
Where can I find current requirements?
Begin with the planning or building department responsible for the address. Ask for its current ADU guidance and any property-specific conditions that could affect the application.
Can I assume rental rules are the same everywhere?
No. Ask the reviewing agency about the current requirements for the proposed unit and rental arrangement before committing to a plan.
Have permit questions for your project?
Ask a local professional about drawings, applications, and inspections for your project.