A Junior ADU (JADU) in San Marino is an in-home accessory unit up to 500 sf, typically converted from existing bedrooms or attached garage space. JADUs are the cheapest permitted ADU type in California.
San Marino is one of the most prestigious cities in the San Gabriel Valley, known for the Huntington Library and top-rated schools. Ultra-high property values create exceptional ADU investment potential.
Why homeowners in San Marino choose this ADU path
- Lowest total cost in the ADU category
- Often qualifies for streamlined permitting
- No separate utility connections required in most cases
- Ideal for caregivers, aging family members, or modest rental income
- Permitted in single-family zones across California
What makes San Marino a strong JADU market
- Among the highest property values in the SGV
- Top-rated San Marino Unified School District
- Huntington Library and Gardens nearby
- Exclusive residential character
- State ADU law ensures permitting access
Junior ADU (JADU) across San Marino neighborhoods
Vision ADU builds throughout San Marino, including San Marino North, San Marino South, Lacy Park Area. Wherever your property sits, we handle design, permits, construction, and final inspection in-house.
San Marino permitting snapshot
Median San Marino home value: $2,400,000. ADU rental range: $3,200-$5,000 per month. Typical permit timeline: 6-10 weeks. Vision ADU handles permitting end-to-end so you do not chase city staff.
Pricing transparency
We publish honest cost ranges and itemized written estimates after every free site evaluation. See our 2026 ADU cost guide for current ranges, or read our full California pricing breakdown.