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ADU Builders & Contractors in Fontana, CA

Fontana, CA is home to 253 ADU contractors ready to help. From initial permits to final inspection, these local professionals know Fontana's building codes and can guide your project from concept to completion.

📊 ADU Quick Facts for Fontana

Avg. Cost/sqft

$200-$375

Permit Timeline

60-120 weeks

Max Size

1200 sqft

Setbacks

4ft sides

Top 253 ADU Contractors in Fontana

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#1CAL-WEST PLUMBING

Fontana, CA

Cal-West Plumbing — licensed ADU contractor in Fontana, CA. Detached ADU construction. 30+ years experience.

View Profile📞 (909) 709 3671
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#2S S S FENCE

Fontana, CA

S S S Fence — licensed ADU contractor in Fontana, CA. Detached ADU construction. 5+ years experience.

View Profile📞 (949) 551 6002
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#3DIME DESIGN LLC

Fontana, CA

Dime Design Llc — licensed ADU contractor in Fontana, CA. Detached ADU construction.

View Profile📞 (626) 422 7449
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#4ROMOLAND GENERAL CONTRACTOR & POOLS INC

Fontana, CA

Romoland General Contractor & Pools Inc — licensed ADU contractor in Fontana, CA. Detached ADU construction. 7+ years experience.

View Profile📞 (562) 215 8156
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#5VICH CONSTRUCTION CO

Fontana, CA

Vich Construction CO — licensed ADU contractor in Fontana, CA. Detached ADU construction. 26+ years experience.

View Profile📞 (562) 307 7830
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#6FIERROS CONSTRUCTION

Fontana, CA

Fierros Construction — licensed ADU contractor in Fontana, CA. Detached ADU construction. 13+ years experience.

View Profile📞 (909) 565 9525
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#7ION CONTRACTING SERVICES

Fontana, CA

Ion Contracting Services — licensed ADU contractor in Fontana, CA. Detached ADU construction. 23+ years experience.

View Profile📞 (909) 841 3856
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#8BECERRA SANTIAGO LEMOS

Fontana, CA

Becerra Santiago Lemos — licensed ADU contractor in Fontana, CA. Detached ADU construction. 37+ years experience.

View Profile📞 (909) 823 1971
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#9H & M FRAMING AND CONSTRUCTION INC

Fontana, CA

H & M Framing And Construction Inc — licensed ADU contractor in Fontana, CA. Detached ADU construction. 8+ years experience.

View Profile📞 (909) 815 6472
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#10MODERN BUILDERS

Fontana, CA

Modern Builders — licensed ADU contractor in Fontana, CA. Detached ADU construction.

View Profile📞 (909) 532 1681
View All 253 Contractors →

💰 How Much Does an ADU Cost in Fontana?

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 Fontana contractors to compare pricing.

❓ Frequently Asked Questions About ADUs in Fontana

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