Can I Build an ADU on My Property in San Jose?
The short answer for most San Jose homeowners is yes — California state law gives most property owners the right to build at least one ADU. However, specific eligibility depends on your lot size, zoning, existing structures, and utility capacity.
ADU Eligibility Requirements in San Jose
- Zoning: Properties zoned residential (R-1, R-2, R-M, etc.) are generally eligible.
- Lot Size: There is no minimum lot size requirement under California state law for ADUs.
- Setbacks: Detached ADUs must meet rear and side setback requirements (minimum 4 feet from property line).
- Height: Maximum 16 feet for detached ADUs (up to 18 feet near transit).
- Fire Safety: Projects must comply with current California Building Code fire safety requirements.
How to Check ADU Eligibility for Your Property
- Visit the San Jose Planning Department website to check your parcel's zoning.
- Review your lot dimensions and available yard space.
- Check for any HOA restrictions (note: HOAs cannot prohibit ADUs under California law, but may regulate appearance).
- Schedule a free consultation with our team for a site-specific assessment.
Want the full picture? Read What Is ADU Building? A Complete Guide , see How Much Does an ADU Cost in San Jose CA? , and check the ADU Permit Guide.
We Handle the Research for You
Our team at San Jose ADU & Remodeling reviews your property's zoning, setbacks, and utility capacity as part of our free initial consultation. Call (650) 900-8598 or visit our contact page to get started.
No. California law (Civil Code Section 4751) prohibits HOAs from preventing ADU or JADU construction on single-family lots. HOAs may regulate certain aspects of design and appearance to maintain community standards, but cannot outright ban them.
Yes. Having a mortgage does not prevent you from building an ADU. However, you should notify your lender and check your loan documents for any covenants that may apply.