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ADU Builders & Contractors in Rossmoor, CA

Rossmoor, CA homeowners looking to build an ADU have 10 licensed contractors to choose from, ready to help. Whether you're planning a garage conversion, detached ADU, or junior ADU, finding the right contractor in Rossmoor starts here.

📊 ADU Quick Facts for Rossmoor

Avg. Cost/sqft

$192-$367

Permit Timeline

60-120 weeks

Max Size

1200 sqft

Setbacks

4ft sides

Top 10 ADU Contractors in Rossmoor

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#1MOFFATT BUILDERS

Rossmoor, CA

Moffatt Builders — licensed ADU contractor in Rossmoor, CA. Detached ADU construction. 18+ years experience.

View Profile📞 (714) 425 2560
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#2YARBROUGH MICHELE LEE

Rossmoor, CA

Yarbrough Michele Lee — licensed ADU contractor in Rossmoor, CA. Detached ADU construction. 12+ years experience.

View Profile📞 (310) 320 4444
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#3ELEMENTS DESIGN + BUILD LLC

Rossmoor, CA

Elements Design + Build Llc — licensed ADU contractor in Rossmoor, CA. Detached ADU construction.

View Profile📞 (562) 842 6411
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#4ALFA BUILDERS INC

Rossmoor, CA

Alfa Builders Inc — licensed ADU contractor in Rossmoor, CA. Detached ADU construction. 23+ years experience.

View Profile📞 (562) 430 4450
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#5S C BUILDING COMPANY

Rossmoor, CA

S C Building Company — licensed ADU contractor in Rossmoor, CA. Detached ADU construction. 7+ years experience.

View Profile📞 (213) 248 4054
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#6R J Z BUILDERS & CONSTRUCTION

Rossmoor, CA

R J Z Builders & Construction — licensed ADU contractor in Rossmoor, CA. Detached ADU construction. 15+ years experience.

View Profile📞 (951) 727 6999
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#7G M D CONSTRUCTION

Rossmoor, CA

G M D Construction — licensed ADU contractor in Rossmoor, CA. Detached ADU construction. 7+ years experience.

View Profile📞 (562) 370 6928
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#8ORANJE BUILDERS INC

Rossmoor, CA

Oranje Builders Inc — licensed ADU contractor in Rossmoor, CA. Detached ADU construction. 9+ years experience.

View Profile📞 (562) 235 9762
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#9TURPIN CONSTRUCTION

Rossmoor, CA

Turpin Construction — licensed ADU contractor in Rossmoor, CA. Detached ADU construction. 7+ years experience.

View Profile📞 (562) 253 9373
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#10VANCE BRYAN CONSTRUCTION

Rossmoor, CA

Vance Bryan Construction — licensed ADU contractor in Rossmoor, CA. Detached ADU construction.

View Profile📞 (562) 842 6411

💰 How Much Does an ADU Cost in Rossmoor?

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

$1,111 - $5,111

Plan check, permits, utility connections

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

❓ Frequently Asked Questions About ADUs in Rossmoor

How much does it cost to build an ADU in Rossmoor?▼
The average cost to build an ADU in Rossmoor 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 Rossmoor?▼
The ADU permit process in Rossmoor 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 Rossmoor?▼
In Rossmoor, 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 Rossmoor?▼
Rossmoor 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 Rossmoor?▼
No parking is required for ADUs in Rossmoor 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

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