San Jose ADU Rules & Regulations
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ADU Rules and Regulations in San Jose
San Jose permits Accessory Dwelling Units (ADUs) and Junior ADUs (JADUs) on residentially zoned properties under California state law and the San Jose Municipal Code (Title 20).
What You Can Build
- Detached ADU: A standalone structure up to 1,200 square feet, up to 16 feet tall, with 4-foot rear and side setbacks.
- Attached ADU: An addition to or conversion within the primary dwelling.
- Junior ADU (JADU): Up to 500 square feet converted from existing space within the primary dwelling.
- Garage Conversion: Convert an existing garage without providing replacement parking.
Dimensional Standards
| Standard | Requirement |
|---|---|
| Max ADU size | 1,200 sq ft |
| Max ADU height | 16 ft |
| Rear setback | 4 ft |
| Side setback | 4 ft |
| Max JADU size | 500 sq ft |
Parking
No additional parking is required for ADUs in San Jose. Replacement parking is not required when converting a garage to an ADU.
Permit Process
- Review your property's zoning using the city's GIS mapping tools
- Prepare architectural plans meeting building code requirements
- Submit a building permit application to the Planning, Building and Code Enforcement Department
- Ministerial review within 60 days of a complete application
- Receive permit, begin construction, and schedule inspections
- Obtain Certificate of Occupancy upon passing final inspection
Fees
Permit fees typically range from $3,000 to $15,000 depending on project scope. ADUs under 750 square feet are exempt from development impact fees per state law. San Jose offers fee deferrals and reductions for qualifying ADU projects.
More about San Jose Zoning
Sources
- City of San Jose - ADU Information·sanjoseca.gov·Accessed 2026-03-22·Direct link
- San Jose Municipal Code - ADU Regulations·library.municode.com·Accessed 2026-03-22·Direct link(Section: Title 20, Chapter 20.30)
FAQ
Frequently Asked Questions
How large can an ADU be in San Jose?
A detached ADU can be up to 1,200 square feet. A Junior ADU (JADU) can be up to 500 square feet converted from existing space within the primary dwelling.
Do I need to provide parking for an ADU in San Jose?
No. San Jose does not require additional parking for ADUs, consistent with California state law.
Disclaimer: The information on this website is provided for general informational purposes only and does not constitute legal, financial, or professional advice. Always verify current requirements with your local planning department.