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ADU Builders & Contractors in San Francisco, CA

San Francisco has California's highest ADU costs at $500–$700 per square foot, with complex builds exceeding $800/sq ft. Architecture and engineering fees run $20,000–$50,000 due to the city's rigorous design review. SF Planning's ADU program allows units in single-family and multi-family zones, plus offers a legalization pathway for unauthorized existing units. Monthly rents of $2,500–$4,000 make hiring an ADU contractor in San Francisco a compelling financial move.

📊 ADU Quick Facts for San Francisco

Avg. Cost/sqft

$500-$700

Permit Timeline

8-20 weeks

Max Size

1200 sqft

Setbacks

4ft sides

View San Francisco Planning Department →

Top 2170 ADU Contractors in San Francisco

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#1MC CLUSKEY CONSTRUCTION

San Francisco, CA

MC Cluskey Construction — licensed ADU contractor in San Francisco, CA. Detached ADU construction. 29+ years experience.

View Profile📞 (415) 750 1121
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#2ACON BUILT

San Francisco, CA

Acon Built — licensed ADU contractor in San Francisco, CA. Detached ADU construction.

View Profile📞 (415) 378 7950
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#3FUGNAI CONSTRUCTION

San Francisco, CA

Fugnai Construction — licensed ADU contractor in San Francisco, CA. Detached ADU construction. 10+ years experience.

View Profile📞 (415) 816 1165
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#4XBO DESIGN BUILD

San Francisco, CA

Xbo Design Build — licensed ADU contractor in San Francisco, CA. Detached ADU construction.

View Profile📞 (669) 260 3794
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#5PETER A CASEY

San Francisco, CA

Peter A Casey — licensed ADU contractor in San Francisco, CA. Detached ADU construction.

View Profile📞 (415) 405 6116
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#6T PRIOR BUILDING CO

San Francisco, CA

T Prior Building CO — licensed ADU contractor in San Francisco, CA. Detached ADU construction.

View Profile📞 (415) 405 5845
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#7SAAVEDRA WORKS

San Francisco, CA

Saavedra Works — licensed ADU contractor in San Francisco, CA. Detached ADU construction. 10+ years experience.

View Profile📞 (415) 637 3694
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#8SUNSHINE CONSTRUCTION

San Francisco, CA

Sunshine Construction — licensed ADU contractor in San Francisco, CA. Detached ADU construction. 16+ years experience.

View Profile📞 (415) 830 1751
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#9HYAN CONSTRUCTION COMPANY

San Francisco, CA

Hyan Construction Company — licensed ADU contractor in San Francisco, CA. Detached ADU construction. 19+ years experience.

View Profile📞 (415) 722 0303
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#10MARTINEZ & SONS CONTRACTORS

San Francisco, CA

Martinez & Sons Contractors — licensed ADU contractor in San Francisco, CA. Detached ADU construction. 33+ years experience.

View Profile📞 (415) 680 5351
View All 2170 Contractors →

💰 How Much Does an ADU Cost in San Francisco?

Garage Conversion

$100,000 - $250,000

Converting existing garage to living space

Detached ADU

$250,000 - $600,000

New standalone unit (600-1,200 sqft)

Permit & Fees

$8,000 - $30,000

Plan check, permits, utility connections

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

❓ Frequently Asked Questions About ADUs in San Francisco

How much does it cost to build an ADU in San Francisco?▼
The average cost to build an ADU in San Francisco ranges from $250,000 to $600,000, or approximately $500 to $700 per square foot. Garage conversions typically cost $100,000 to $250,000.
How long does it take to get an ADU permit in San Francisco?▼
The ADU permit process in San Francisco typically takes 8 to 20 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 Francisco?▼
In San Francisco, 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 Francisco?▼
San Francisco 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 Francisco?▼
No parking is required for ADUs in San Francisco 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

Los Angeles (3215)San Diego (2582)Sacramento (1551)Riverside (925)Fresno (904)Anaheim (784)Irvine (760)Huntington Beach (667)

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