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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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#1D & V ELECTRIC INC

Fullerton, CA

D & V Electric Inc — licensed ADU contractor in Fullerton, CA. Detached ADU construction.

View Profile📞 (626) 677 7777
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#2COLE DUKE & ASSOCIATES

Fullerton, CA

Cole Duke & Associates — licensed ADU contractor in Fullerton, CA. Detached ADU construction. 8+ years experience.

View Profile📞 (800) 945 3921
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#3HORIZON CONSTRUCTION & REMODELING INC

Fullerton, CA

Horizon Construction & Remodeling Inc — licensed ADU contractor in Fullerton, CA. Detached ADU construction. 16+ years experience.

View Profile📞 (714) 449 9035
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#4CONCRETE WORX INC

Fullerton, CA

Concrete Worx Inc — licensed ADU contractor in Fullerton, CA. Detached ADU construction. 6+ years experience.

View Profile📞 (714) 936 9155
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#5GAVIDIA R R P

Fullerton, CA

Gavidia R R P — licensed ADU contractor in Fullerton, CA. Detached ADU construction. 7+ years experience.

View Profile📞 (714) 486 8527
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#655 PROPERTY SERVICES INC

Fullerton, CA

55 Property Services Inc — licensed ADU contractor in Fullerton, CA. Detached ADU construction. 6+ years experience.

View Profile📞 (866) 586 2626
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#7PHOEBE CONSTRUCTION

Fullerton, CA

Phoebe Construction — licensed ADU contractor in Fullerton, CA. Detached ADU construction. 5+ years experience.

View Profile📞 (626) 696 6994
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#8VECTOR GENERAL CONTRACTORS INC

Fullerton, CA

Vector General Contractors Inc — licensed ADU contractor in Fullerton, CA. Detached ADU construction. 10+ years experience.

View Profile📞 (866) 755 4001
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#9LANE BUILDING SYSTEMS INC

Fullerton, CA

Lane Building Systems Inc — licensed ADU contractor in Fullerton, CA. Detached ADU construction. 17+ years experience.

View Profile📞 (714) 925 3430
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#10ARI BUILDERS

Fullerton, CA

Ari Builders — licensed ADU contractor in Fullerton, CA. Detached ADU construction. 37+ years experience.

View Profile📞 (714) 325 4944
View All 368 Contractors →

💰 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

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