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ADU Builders & Contractors in San Diego, CA

San Diego homeowners invest $300,000–$450,000 for a detached ADU build at $375–$600+ per square foot. The city leads California in ADU permitting, issuing thousands of permits yearly. Impact fees are waived for units under 750 sq ft, saving $15,000–$25,000. The coastal climate means fewer weather delays, and an experienced ADU contractor in San Diego can navigate the city's lot coverage and setback rules for an efficient, code-compliant build.

📊 ADU Quick Facts for San Diego

Avg. Cost/sqft

$300-$550

Permit Timeline

4-12 weeks

Max Size

1200 sqft

Setbacks

4ft sides

View San Diego Planning Department →

Top 2582 ADU Contractors in San Diego

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#1EL DORADO CONSTRUCTION

San Diego, CA

EL Dorado Construction — licensed ADU contractor in San Diego, CA. Detached ADU construction. 5+ years experience.

View Profile📞 (619) 760 3636
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#2H S L REMODELING AND REPAIRS

San Diego, CA

H S L Remodeling And Repairs — licensed ADU contractor in San Diego, CA. Detached ADU construction. 26+ years experience.

View Profile📞 (858) 735 2484
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#3FK DESIGN AND CONSTRUCTION INC

San Diego, CA

FK Design And Construction Inc — licensed ADU contractor in San Diego, CA. Detached ADU construction. 7+ years experience.

View Profile📞 (858) 951 8277
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#4MODA HOME INC

San Diego, CA

Moda Home Inc — licensed ADU contractor in San Diego, CA. Detached ADU construction. 16+ years experience.

View Profile📞 (858) 699 0061
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#5HERTIG CONSTRUCTION

San Diego, CA

Hertig Construction — licensed ADU contractor in San Diego, CA. Detached ADU construction. 18+ years experience.

View Profile📞 (858) 688 2505
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#6SMART DRY RESTORATION

San Diego, CA

Smart Dry Restoration — licensed ADU contractor in San Diego, CA. Detached ADU construction. 6+ years experience.

View Profile📞 (858) 433 5100
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#7ROYAL DESIGN DEVELOPMENT INC

San Diego, CA

Royal Design Development Inc — licensed ADU contractor in San Diego, CA. Detached ADU construction. 15+ years experience.

View Profile📞 (619) 955 3900
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#8CONSTRUCTION 10C

San Diego, CA

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

View Profile📞 (619) 288 2198
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#9G E A BUILDERS INC

San Diego, CA

G E A Builders Inc — licensed ADU contractor in San Diego, CA. Detached ADU construction. 26+ years experience.

View Profile📞 (619) 862 0924
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#10WHC & CO

San Diego, CA

Whc & CO — licensed ADU contractor in San Diego, CA. Detached ADU construction. 17+ years experience.

View Profile📞 (619) 583 2357
View All 2582 Contractors →

💰 How Much Does an ADU Cost in San Diego?

Garage Conversion

$75,000 - $180,000

Converting existing garage to living space

Detached ADU

$150,000 - $380,000

New standalone unit (600-1,200 sqft)

Permit & Fees

$6,500 - $21,000

Plan check, permits, utility connections

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

❓ Frequently Asked Questions About ADUs in San Diego

How much does it cost to build an ADU in San Diego?▼
The average cost to build an ADU in San Diego ranges from $150,000 to $380,000, or approximately $300 to $550 per square foot. Garage conversions typically cost $75,000 to $180,000.
How long does it take to get an ADU permit in San Diego?▼
The ADU permit process in San Diego typically takes 4 to 12 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 Diego?▼
In San Diego, 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 Diego?▼
San Diego 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 Diego?▼
No parking is required for ADUs in San Diego 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 Francisco (2170)Sacramento (1551)Riverside (925)Fresno (904)Anaheim (784)Irvine (760)Huntington Beach (667)

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