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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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#1ASTERA AI

Rancho Santa Margarita, CA

Astera AI — licensed ADU contractor in Rancho Santa Margarita, CA. Detached ADU construction.

View Profile📞 (615) 476 7878
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#2RAM DESIGN & BUILDING

Rancho Santa Margarita, CA

Ram Design & Building — licensed ADU contractor in Rancho Santa Margarita, CA. Detached ADU construction. 27+ years experience.

View Profile📞 (831) 383 8711
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#31ST CHOICE CONSTRUCTION SOLUTIONS

Rancho Santa Margarita, CA

1st Choice Construction Solutions — licensed ADU contractor in Rancho Santa Margarita, CA. Detached ADU construction. 5+ years experience.

View Profile📞 (949) 290 9462
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#4STEADFAST CONSTRUCTORS

Rancho Santa Margarita, CA

Steadfast Constructors — licensed ADU contractor in Rancho Santa Margarita, CA. Detached ADU construction. 6+ years experience.

View Profile📞 (805) 207 0232
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#5SOUTH COUNTY PLUMBING INC

Rancho Santa Margarita, CA

South County Plumbing Inc — licensed ADU contractor in Rancho Santa Margarita, CA. Detached ADU construction. 13+ years experience.

View Profile📞 (949) 306 3930
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#6LANDA CONSTRUCTION

Rancho Santa Margarita, CA

Landa Construction — licensed ADU contractor in Rancho Santa Margarita, CA. Detached ADU construction. 21+ years experience.

View Profile📞 (714) 349 9076
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#7ACCELERATED RESTORATION

Rancho Santa Margarita, CA

Accelerated Restoration — licensed ADU contractor in Rancho Santa Margarita, CA. Detached ADU construction.

View Profile📞 (949) 257 8012
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#8ROMAR PROPERTY SERVICES INC

Rancho Santa Margarita, CA

Romar Property Services Inc — licensed ADU contractor in Rancho Santa Margarita, CA. Detached ADU construction. 29+ years experience.

View Profile📞 (714) 227 1777
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#9ROBERTS MICHAEL HOME BUILDER INC

Rancho Santa Margarita, CA

Roberts Michael Home Builder Inc — licensed ADU contractor in Rancho Santa Margarita, CA. Detached ADU construction. 32+ years experience.

View Profile📞 (949) 858 7540
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#10CLASS ONE CLEANROOMS

Rancho Santa Margarita, CA

Class One Cleanrooms — licensed ADU contractor in Rancho Santa Margarita, CA. Detached ADU construction. 41+ years experience.

View Profile📞 (949) 589 9008
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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