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ADU Builders & Contractors in San Marcos, CA

San Marcos, CA is home to 248 ADU contractors ready to help. From initial permits to final inspection, these local professionals know San Marcos's building codes and can guide your project from concept to completion.

📊 ADU Quick Facts for San Marcos

Avg. Cost/sqft

$193-$368

Permit Timeline

60-120 weeks

Max Size

1200 sqft

Setbacks

4ft sides

Top 248 ADU Contractors in San Marcos

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#1EG CREATIVE DESIGN BUILD INC

San Marcos, CA

EG Creative Design Build Inc — licensed ADU contractor in San Marcos, CA. Detached ADU construction.

View Profile📞 (858) 588 7900
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#2PLUMB365 CONSTRUCTION

San Marcos, CA

Plumb365 Construction — licensed ADU contractor in San Marcos, CA. Detached ADU construction. 6+ years experience.

View Profile📞 (760) 453 4653
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#3HUTTON DEVELOPMENT

San Marcos, CA

Hutton Development — licensed ADU contractor in San Marcos, CA. Detached ADU construction. 18+ years experience.

View Profile📞 (858) 401 9351
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#4PALOMAR RESTORATION SERVICES INC

San Marcos, CA

Palomar Restoration Services Inc — licensed ADU contractor in San Marcos, CA. Detached ADU construction.

View Profile📞 (760) 755 1440
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#51 SOURCE ELECTRICAL INC

San Marcos, CA

1 Source Electrical Inc — licensed ADU contractor in San Marcos, CA. Detached ADU construction. 15+ years experience.

View Profile📞 (760) 739 1987
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#6CURRAN BRIAN CONSTRUCTION INC

San Marcos, CA

Curran Brian Construction Inc — licensed ADU contractor in San Marcos, CA. Detached ADU construction. 20+ years experience.

View Profile📞 (619) 890 1105
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#7STAFFORD JAMES CONSTRUCTION

San Marcos, CA

Stafford James Construction — licensed ADU contractor in San Marcos, CA. Detached ADU construction.

View Profile📞 (760) 759 0785
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#8FIRESTONE BUILDERS INC

San Marcos, CA

Firestone Builders Inc — licensed ADU contractor in San Marcos, CA. Detached ADU construction. 34+ years experience.

View Profile📞 (760) 304 1234
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#9DEVITA ADAM

San Marcos, CA

Devita Adam — licensed ADU contractor in San Marcos, CA. Detached ADU construction. 13+ years experience.

View Profile📞 (760) 420 6210
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#10WILSON CONSTRUCTION FORENSICS & CONSULTING

San Marcos, CA

Wilson Construction Forensics & Consulting — licensed ADU contractor in San Marcos, CA. Detached ADU construction. 43+ years experience.

View Profile📞 (619) 843 2819
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💰 How Much Does an ADU Cost in San Marcos?

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 Marcos contractors to compare pricing.

❓ Frequently Asked Questions About ADUs in San Marcos

How much does it cost to build an ADU in San Marcos?▼
The average cost to build an ADU in San Marcos 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 Marcos?▼
The ADU permit process in San Marcos 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 Marcos?▼
In San Marcos, 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 Marcos?▼
San Marcos 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 Marcos?▼
No parking is required for ADUs in San Marcos 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)San Francisco (2170)Sacramento (1551)Riverside (925)Fresno (904)Anaheim (784)Irvine (760)

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