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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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#1CORE CONSTRUCT INC

San Diego, CA

Core Construct Inc — licensed ADU contractor in San Diego, CA. Detached ADU construction.

View Profile📞 (619) 786 6235
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#2M A C HOME REPAIRS

San Diego, CA

M A C Home Repairs — licensed ADU contractor in San Diego, CA. Detached ADU construction. 29+ years experience.

View Profile📞 (858) 967 6054
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#3BALLESTAS CONSTRUCTION

San Diego, CA

Ballestas Construction — licensed ADU contractor in San Diego, CA. Detached ADU construction.

View Profile📞 (786) 973 5504
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#4REID CONSTRUCTION & GENERAL CONTRACTING

San Diego, CA

Reid Construction & General Contracting — licensed ADU contractor in San Diego, CA. Detached ADU construction.

View Profile📞 (619) 370 5851
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#5OLSEN J CONSTRUCTION

San Diego, CA

Olsen J Construction — licensed ADU contractor in San Diego, CA. Detached ADU construction. 12+ years experience.

View Profile📞 (760) 445 4532
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#6FISHER GROSS INC

San Diego, CA

Fisher Gross Inc — licensed ADU contractor in San Diego, CA. Detached ADU construction. 15+ years experience.

View Profile📞 (619) 574 0531
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#7FORMAN COMPANY THE

San Diego, CA

Forman Company The — licensed ADU contractor in San Diego, CA. Detached ADU construction. 43+ years experience.

View Profile📞 (619) 462 7880
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#8VOUGHT ENTERPRISES

San Diego, CA

Vought Enterprises — licensed ADU contractor in San Diego, CA. Detached ADU construction. 21+ years experience.

View Profile📞 (619) 818 9996
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#9GAUTT DAMIEN CONSTRUCTION

San Diego, CA

Gautt Damien Construction — licensed ADU contractor in San Diego, CA. Detached ADU construction.

View Profile📞 (619) 228 4304
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#10AMERICAN GLOBAL TECHNOLOGIES INC

San Diego, CA

American Global Technologies Inc — licensed ADU contractor in San Diego, CA. Detached ADU construction.

View Profile📞 (858) 952 9538
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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