ADU Rules in San Diego, CA — 2026 Guide
Check if your San Diego property qualifies for an ADU in 20 seconds
San Diego ADU Rules at a Glance
San Diego is considered ADU-friendly. Here are the key regulations.
- San Diego adopted some of the most permissive local ADU rules in the state.
- Complete Move-In Ready ADU program offers pre-approved floor plans for faster permitting.
- No setback required for ADU conversions of existing structures.
- Unlimited ADUs allowed on multi-family properties if each is under 800 sqft.
What ReadyPermit Checks for San Diego Properties
Enter any San Diego address and get an instant ADU feasibility analysis covering:
Zoning Compliance
Verify your San Diego 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 Diego 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 Diego Property Free
Enter your address below. In under 20 seconds you will know if your San Diego lot qualifies for an ADU — no phone calls, no waiting.
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