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ADU Builders & Contractors in Rancho Santa Margarita, CA

Building an ADU in Rancho Santa Margarita? You'll find 106 licensed contractors in the area, ready to help. Rancho Santa Margarita's ADU market continues to grow as homeowners invest in additional living space, rental income, and multi-generational housing.

📊 ADU Quick Facts for Rancho Santa Margarita

Avg. Cost/sqft

$192-$367

Permit Timeline

60-120 weeks

Max Size

1200 sqft

Setbacks

4ft sides

Top 106 ADU Contractors in Rancho Santa Margarita

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#1ALIREZA SABOURIAZAD

Rancho Santa Margarita, CA

Alireza Sabouriazad — licensed ADU contractor in Rancho Santa Margarita, CA. Detached ADU construction. 5+ years experience.

View Profile📞 (760) 298 9470
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#2MERCIER RICK E

Rancho Santa Margarita, CA

Mercier Rick E — licensed ADU contractor in Rancho Santa Margarita, CA. Detached ADU construction. 21+ years experience.

View Profile📞 (949) 888 9990
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#3DEFINITION TECHNOLOGIES & FABRICATION

Rancho Santa Margarita, CA

Definition Technologies & Fabrication — licensed ADU contractor in Rancho Santa Margarita, CA. Detached ADU construction.

View Profile📞 (949) 444 4434
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#4AMPCO NORTH INC

Rancho Santa Margarita, CA

Ampco North Inc — licensed ADU contractor in Rancho Santa Margarita, CA. Detached ADU construction. 9+ years experience.

View Profile📞 (714) 740 7841
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#5SHAHINNEJAD ALIREZA

Rancho Santa Margarita, CA

Shahinnejad Alireza — licensed ADU contractor in Rancho Santa Margarita, CA. Detached ADU construction. 13+ years experience.

View Profile📞 (805) 320 3309
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#6A2 CONTRACTING INC

Rancho Santa Margarita, CA

A2 Contracting Inc — licensed ADU contractor in Rancho Santa Margarita, CA. Detached ADU construction.

View Profile📞 (949) 599 8328
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#7VERSA - TECH CONSTRUCTION

Rancho Santa Margarita, CA

Versa - Tech Construction — licensed ADU contractor in Rancho Santa Margarita, CA. Detached ADU construction. 20+ years experience.

View Profile📞 (575) 361 3399
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#8PLATINUM DEMOLITION

Rancho Santa Margarita, CA

Platinum Demolition — licensed ADU contractor in Rancho Santa Margarita, CA. Detached ADU construction.

View Profile📞 (949) 357 8213
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#9PANZARELLA SALVI

Rancho Santa Margarita, CA

Panzarella Salvi — licensed ADU contractor in Rancho Santa Margarita, CA. Detached ADU construction. 37+ years experience.

View Profile📞 (714) 350 2387
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#10RUHI CONSTRUCTION OC

Rancho Santa Margarita, CA

Ruhi Construction OC — licensed ADU contractor in Rancho Santa Margarita, CA. Detached ADU construction.

View Profile📞 (949) 506 7722
View All 106 Contractors →

💰 How Much Does an ADU Cost in Rancho Santa Margarita?

Garage Conversion

$66,000 - $126,000

Converting existing garage to living space

Detached ADU

$142,000 - $317,000

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 Rancho Santa Margarita contractors to compare pricing.

❓ Frequently Asked Questions About ADUs in Rancho Santa Margarita

How much does it cost to build an ADU in Rancho Santa Margarita?▼
The average cost to build an ADU in Rancho Santa Margarita ranges from $142,000 to $317,000, or approximately $192 to $367 per square foot. Garage conversions typically cost $66,000 to $126,000.
How long does it take to get an ADU permit in Rancho Santa Margarita?▼
The ADU permit process in Rancho Santa Margarita 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 Rancho Santa Margarita?▼
In Rancho Santa Margarita, 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 Rancho Santa Margarita?▼
Rancho Santa Margarita 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 Rancho Santa Margarita?▼
No parking is required for ADUs in Rancho Santa Margarita 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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