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ADU Builders & Contractors in San Marino, CA

San Marino, CA homeowners looking to build an ADU have 52 licensed contractors to choose from, ready to help. Whether you're planning a garage conversion, detached ADU, or junior ADU, finding the right contractor in San Marino starts here.

📊 ADU Quick Facts for San Marino

Avg. Cost/sqft

$193-$368

Permit Timeline

60-120 weeks

Max Size

1200 sqft

Setbacks

4ft sides

Top 52 ADU Contractors in San Marino

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#1CASA BONITA DEVELOPMENT INC

San Marino, CA

Casa Bonita Development Inc — licensed ADU contractor in San Marino, CA. Detached ADU construction. 25+ years experience.

View Profile📞 (626) 255 3983
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#2LINEWORK DEVELOPMENT AND CONSTRUCTION INC

San Marino, CA

Linework Development And Construction Inc — licensed ADU contractor in San Marino, CA. Detached ADU construction. 9+ years experience.

View Profile📞 (626) 594 5005
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#3MALONEY E L CO

San Marino, CA

Maloney E L CO — licensed ADU contractor in San Marino, CA. Detached ADU construction. 51+ years experience.

View Profile📞 (626) 289 0228
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#4A A GRECO, INC

San Marino, CA

A A Greco, Inc — licensed ADU contractor in San Marino, CA. Detached ADU construction. 36+ years experience.

View Profile📞 (310) 678 9247
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#5SOCAL ELITE CONSTRUCTION INC

San Marino, CA

Socal Elite Construction Inc — licensed ADU contractor in San Marino, CA. Detached ADU construction.

View Profile📞 (626) 410 0015
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#6LUXUS CONSTRUCTION INC

San Marino, CA

Luxus Construction Inc — licensed ADU contractor in San Marino, CA. Detached ADU construction. 14+ years experience.

View Profile📞 (310) 270 8596
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#7E R HEART CONSTRUCTION

San Marino, CA

E R Heart Construction — licensed ADU contractor in San Marino, CA. Detached ADU construction. 25+ years experience.

View Profile📞 (626) 390 3231
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#8YANG CONSTRUCTION

San Marino, CA

Yang Construction — licensed ADU contractor in San Marino, CA. Detached ADU construction.

View Profile📞 (310) 923 8815
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#9PAG CONSTRUCTION INC

San Marino, CA

Pag Construction Inc — licensed ADU contractor in San Marino, CA. Detached ADU construction. 33+ years experience.

View Profile📞 (818) 881 0022
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#10MARIANO DEVELOPMENT INC

San Marino, CA

Mariano Development Inc — licensed ADU contractor in San Marino, CA. Detached ADU construction. 12+ years experience.

View Profile📞 (626) 280 4112
View All 52 Contractors →

💰 How Much Does an ADU Cost in San Marino?

Garage Conversion

$66,500 - $126,500

Converting existing garage to living space

Detached ADU

$143,000 - $318,000

New standalone unit (600-1,200 sqft)

Permit & Fees

$1,097 - $5,097

Plan check, permits, utility connections

* Costs vary based on size, finishes, site conditions, and contractor. Get quotes from multiple San Marino contractors to compare pricing.

❓ Frequently Asked Questions About ADUs in San Marino

How much does it cost to build an ADU in San Marino?▼
The average cost to build an ADU in San Marino ranges from $143,000 to $318,000, or approximately $193 to $368 per square foot. Garage conversions typically cost $66,500 to $126,500.
How long does it take to get an ADU permit in San Marino?▼
The ADU permit process in San Marino typically takes 60 to 120 weeks. California law requires cities to approve or deny ADU permits within 60 days of receiving a complete application.
What are the ADU size limits in San Marino?▼
In San Marino, detached ADUs can be up to 1200 square feet. Attached ADUs are limited to 50% of the primary dwelling or 1,200 sqft, whichever is less. Junior ADUs (JADUs) are limited to 500 sqft and must be within the existing home.
What is the setback requirement for ADUs in San Marino?▼
San Marino requires 4-foot setbacks from side property lines and 4-foot setbacks from rear property lines for new ADU construction. Converted structures (like existing garages) may maintain their current setbacks.
Do I need to provide parking for my ADU in San Marino?▼
No parking is required for ADUs in San Marino if your property is within half a mile of public transit, in a historic district, part of an existing multi-family building, or if the ADU is a garage conversion. Otherwise, one space may be required.

Also See ADU Contractors In

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