ADU Rules in San Jose, CA — 2026 Guide
Check if your San Jose property qualifies for an ADU in 20 seconds
San Jose ADU Rules at a Glance
San Jose is considered ADU-friendly. Here are the key regulations.
- San Jose permits ADUs up to 1,200 sqft on single-family lots.
- City offers an ADU Ally program with financing and technical assistance.
- No parking required for ADUs within a half mile of transit.
- Detached ADUs allowed up to 16 ft in height (two stories) with rear setbacks.
What ReadyPermit Checks for San Jose Properties
Enter any San Jose address and get an instant ADU feasibility analysis covering:
Zoning Compliance
Verify your San Jose lot is zoned for ADU construction under current CA and local rules.
Setbacks & Coverage
Check required setbacks, lot coverage limits, and height restrictions for your specific parcel.
ADU Size Limits
Calculate the maximum ADU square footage allowed based on your lot size and primary dwelling.
Permit Requirements
Understand what permits and approvals San Jose requires before you can break ground.
Flood & Hazard Zones
Identify if your property falls in a flood zone, fire zone, or other hazard overlay.
Lot & Parcel Data
Pull parcel boundaries, lot dimensions, and existing structures from county records.
Check Your San Jose Property Free
Enter your address below. In under 20 seconds you will know if your San Jose lot qualifies for an ADU — no phone calls, no waiting.
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