ADU Rules in San Bernardino, CA — 2026 Guide
Check if your San Bernardino property qualifies for an ADU in 20 seconds
San Bernardino ADU Rules at a Glance
San Bernardino is considered ADU-friendly. Here are the key regulations.
- California state law applies — ADUs permitted by right on single-family lots.
- Lower land and construction costs than coastal CA make ADU ROI compelling.
- ADUs up to 1,200 sqft allowed on most residential parcels.
- No owner-occupancy requirement for ADUs permitted after Jan 1, 2025.
What ReadyPermit Checks for San Bernardino Properties
Enter any San Bernardino address and get an instant ADU feasibility analysis covering:
Zoning Compliance
Verify your San Bernardino 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 Bernardino 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 Bernardino Property Free
Enter your address below. In under 20 seconds you will know if your San Bernardino lot qualifies for an ADU — no phone calls, no waiting.
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