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ADU Builders & Contractors in Fountain Valley, CA

With 155 verified ADU contractors serving Fountain Valley, CA, homeowners have plenty of options for their accessory dwelling unit project. Local contractors ready to help specialize in everything from design-build to permit navigation.

📊 ADU Quick Facts for Fountain Valley

Avg. Cost/sqft

$200-$375

Permit Timeline

60-120 weeks

Max Size

1200 sqft

Setbacks

4ft sides

Top 155 ADU Contractors in Fountain Valley

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#1KIEFER CONSTRUCTION

Fountain Valley, CA

Kiefer Construction — licensed ADU contractor in Fountain Valley, CA. Detached ADU construction. 44+ years experience.

View Profile📞 (714) 814 0929
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#2JESSE JAMES CONSTRUCTION

Fountain Valley, CA

Jesse James Construction — licensed ADU contractor in Fountain Valley, CA. Detached ADU construction.

View Profile📞 (714) 936 1351
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#3MARTIN THIBAULT CONSTRUCTION

Fountain Valley, CA

Martin Thibault Construction — licensed ADU contractor in Fountain Valley, CA. Detached ADU construction. 18+ years experience.

View Profile📞 (714) 421 3429
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#4EVANS MICHAEL A INC

Fountain Valley, CA

Evans Michael A Inc — licensed ADU contractor in Fountain Valley, CA. Detached ADU construction. 39+ years experience.

View Profile📞 (714) 963 6809
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#5BUILD MASTER CONSTRUCTION

Fountain Valley, CA

Build Master Construction — licensed ADU contractor in Fountain Valley, CA. Detached ADU construction.

View Profile📞 (626) 554 6606
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#6HOKE EDWARD D CO INC

Fountain Valley, CA

Hoke Edward D CO Inc — licensed ADU contractor in Fountain Valley, CA. Detached ADU construction. 35+ years experience.

View Profile📞 (714) 329 0837
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#7J I DRYWALL INC

Fountain Valley, CA

J I Drywall Inc — licensed ADU contractor in Fountain Valley, CA. Detached ADU construction. 19+ years experience.

View Profile📞 (714) 606 9926
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#8MEZA CONSTRUK

Fountain Valley, CA

Meza Construk — licensed ADU contractor in Fountain Valley, CA. Detached ADU construction.

View Profile📞 (714) 258 6492
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#9V M CONSTRUCTION SPECIALTIES INC

Fountain Valley, CA

V M Construction Specialties Inc — licensed ADU contractor in Fountain Valley, CA. Detached ADU construction. 11+ years experience.

View Profile📞 (714) 725 4233
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#10GOODYEAR INVESTMENT INC

Fountain Valley, CA

Goodyear Investment Inc — licensed ADU contractor in Fountain Valley, CA. Detached ADU construction. 26+ years experience.

View Profile📞 (714) 557 7970
View All 155 Contractors →

💰 How Much Does an ADU Cost in Fountain Valley?

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

$1,111 - $5,111

Plan check, permits, utility connections

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

❓ Frequently Asked Questions About ADUs in Fountain Valley

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