Can I Build an ADU in San Bernardino?
Data version: Q2 2026 · Last updated 2026-05-13
TL;DR. San Bernardino is one of the ADU-friendlier cities in California. Buildability™ checks the San Bernardino ADU ordinance, California state law, your zoning district, lot size, setbacks, parking, and owner-occupancy rules in about 20 seconds — free for your first check.
San Bernardino ADU rules at a glance
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.
Typical San Bernardino lot profile
Most San Bernardino single-family parcels are about 6,000–8,000 sqft with a median home price near $380,000 in a city of roughly 222K residents. Lot size drives ADU feasibility — smaller lots often still qualify for a JADU even when a detached ADU doesn't fit.
ADU vs JADU
A detached ADU is a new stand-alone structure. An attached ADU is built onto the primary home. A JADU (Junior ADU) is carved out of the existing house with a small kitchenette — usually capped around 500 sqft but easier to permit. Buildability™ checks eligibility for all three types on your specific San Bernardino address.
Next steps
Enter your San Bernardino address into Buildability™ for a free ADU eligibility check. If your lot qualifies, hire a licensed architect and a permit expediter who knows the San Bernardino planning and building departments.
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