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ADU Builders & Contractors in Fullerton, CA

Fullerton, CA is home to 368 ADU contractors ready to help. From initial permits to final inspection, these local professionals know Fullerton's building codes and can guide your project from concept to completion.

📊 ADU Quick Facts for Fullerton

Avg. Cost/sqft

$200-$375

Permit Timeline

60-120 weeks

Max Size

1200 sqft

Setbacks

4ft sides

Top 368 ADU Contractors in Fullerton

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#1MD ENTERPRISES INC

Fullerton, CA

MD Enterprises Inc — licensed ADU contractor in Fullerton, CA. Detached ADU construction.

View Profile📞 (213) 507 1979
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#2ESKIN ENNA

Fullerton, CA

Eskin Enna — licensed ADU contractor in Fullerton, CA. Detached ADU construction. 10+ years experience.

View Profile📞 (714) 797 3377
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#3U S CONSTRUCTION

Fullerton, CA

U S Construction — licensed ADU contractor in Fullerton, CA. Detached ADU construction. 34+ years experience.

View Profile📞 (213) 255 6669
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#4CUSTOM A D U BUILDER

Fullerton, CA

Custom A D U Builder — licensed ADU contractor in Fullerton, CA. Detached ADU construction.

View Profile📞 (714) 488 3160
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#5HUMBLE HOME IMPROVEMENTS

Fullerton, CA

Humble Home Improvements — licensed ADU contractor in Fullerton, CA. Detached ADU construction.

View Profile📞 (714) 476 1829
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#6PHILIP H HAN

Fullerton, CA

Philip H Han — licensed ADU contractor in Fullerton, CA. Detached ADU construction. 8+ years experience.

View Profile📞 (714) 292 2953
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#7SUPERIOR WALL SYSTEMS INC

Fullerton, CA

Superior Wall Systems Inc — licensed ADU contractor in Fullerton, CA. Detached ADU construction. 40+ years experience.

View Profile📞 (714) 278 0000
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#8J & L CONSTRUCTION SERVICES

Fullerton, CA

J & L Construction Services — licensed ADU contractor in Fullerton, CA. Detached ADU construction. 15+ years experience.

View Profile📞 (714) 272 8378
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#9CHENG CHUN WEI

Fullerton, CA

Cheng Chun Wei — licensed ADU contractor in Fullerton, CA. Detached ADU construction. 11+ years experience.

View Profile📞 (949) 207 8035
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#10C G PATIO ROOMS & COVERS INC

Fullerton, CA

C G Patio Rooms & Covers Inc — licensed ADU contractor in Fullerton, CA. Detached ADU construction. 23+ years experience.

View Profile📞 (714) 742 9255
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💰 How Much Does an ADU Cost in Fullerton?

Garage Conversion

$70,000 - $130,000

Converting existing garage to living space

Detached ADU

$150,000 - $325,000

New standalone unit (600-1,200 sqft)

Permit & Fees

$1,117 - $5,117

Plan check, permits, utility connections

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

❓ Frequently Asked Questions About ADUs in Fullerton

How much does it cost to build an ADU in Fullerton?▼
The average cost to build an ADU in Fullerton ranges from $150,000 to $325,000, or approximately $200 to $375 per square foot. Garage conversions typically cost $70,000 to $130,000.
How long does it take to get an ADU permit in Fullerton?▼
The ADU permit process in Fullerton 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 Fullerton?▼
In Fullerton, 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 Fullerton?▼
Fullerton 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 Fullerton?▼
No parking is required for ADUs in Fullerton 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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