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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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#1GRAPE PRINTS

Fountain Valley, CA

Grape Prints — licensed ADU contractor in Fountain Valley, CA. Detached ADU construction.

View Profile📞 (714) 548 1464
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#2DEJA VU CONSTRUCTION

Fountain Valley, CA

Deja VU Construction — licensed ADU contractor in Fountain Valley, CA. Detached ADU construction. 16+ years experience.

View Profile📞 (469) 360 9440
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#3O C REMODELING

Fountain Valley, CA

O C Remodeling — licensed ADU contractor in Fountain Valley, CA. Detached ADU construction. 8+ years experience.

View Profile📞 (949) 800 9185
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#4A V CONSTRUCTION INC

Fountain Valley, CA

A V Construction Inc — licensed ADU contractor in Fountain Valley, CA. Detached ADU construction. 22+ years experience.

View Profile📞 (714) 964 4838
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#5BATTRES BUILDERS

Fountain Valley, CA

Battres Builders — licensed ADU contractor in Fountain Valley, CA. Detached ADU construction. 7+ years experience.

View Profile📞 (714) 759 0709
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#6GCS CONSTRUCT

Fountain Valley, CA

Gcs Construct — licensed ADU contractor in Fountain Valley, CA. Detached ADU construction. 20+ years experience.

View Profile📞 (714) 745 6909
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#7VU HVAC AND CONSTRUCTION

Fountain Valley, CA

VU Hvac And Construction — licensed ADU contractor in Fountain Valley, CA. Detached ADU construction. 20+ years experience.

View Profile📞 (714) 873 3666
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#8TRANCO

Fountain Valley, CA

Tranco — licensed ADU contractor in Fountain Valley, CA. Detached ADU construction. 33+ years experience.

View Profile📞 (714) 235 6763
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#9DO BUILDER & DESIGN INC

Fountain Valley, CA

DO Builder & Design Inc — licensed ADU contractor in Fountain Valley, CA. Detached ADU construction. 11+ years experience.

View Profile📞 (714) 847 3456
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#10GRIFFIN CONSTRUCTION SERVICES

Fountain Valley, CA

Griffin Construction Services — licensed ADU contractor in Fountain Valley, CA. Detached ADU construction. 7+ years experience.

View Profile📞 (949) 307 2945
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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