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ADU Builders & Contractors in Montclair, CA

With 77 verified ADU contractors serving Montclair, 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 Montclair

Avg. Cost/sqft

$207-$382

Permit Timeline

60-120 weeks

Max Size

1200 sqft

Setbacks

4ft sides

Top 77 ADU Contractors in Montclair

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#1AZLAN

Montclair, CA

Azlan — licensed ADU contractor in Montclair, CA. Detached ADU construction. 9+ years experience.

View Profile📞 (818) 262 9524
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#2CBRB CONSTRUCTION

Montclair, CA

Cbrb Construction — licensed ADU contractor in Montclair, CA. Detached ADU construction.

View Profile📞 (626) 217 3164
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#3ARAGON CONSTRUCTION INC

Montclair, CA

Aragon Construction Inc — licensed ADU contractor in Montclair, CA. Detached ADU construction. 24+ years experience.

View Profile📞 (909) 621 2200
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#4D N BUILDERS INC

Montclair, CA

D N Builders Inc — licensed ADU contractor in Montclair, CA. Detached ADU construction.

View Profile📞 (323) 301 5959
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#5SMS BUILDERS INC

Montclair, CA

Sms Builders Inc — licensed ADU contractor in Montclair, CA. Detached ADU construction. 24+ years experience.

View Profile📞 (909) 267 3655
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#6STRAIGHT SQUARE CONSTRUCTION

Montclair, CA

Straight Square Construction — licensed ADU contractor in Montclair, CA. Detached ADU construction. 10+ years experience.

View Profile📞 (909) 753 6013
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#7LIU CHONG CONSTRUCTION

Montclair, CA

Liu Chong Construction — licensed ADU contractor in Montclair, CA. Detached ADU construction. 5+ years experience.

View Profile📞 (626) 367 4888
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#8ANGEL JOSE RICARDO

Montclair, CA

Angel Jose Ricardo — licensed ADU contractor in Montclair, CA. Detached ADU construction. 17+ years experience.

View Profile📞 (909) 315 9807
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#9TALEE INC

Montclair, CA

Talee Inc — licensed ADU contractor in Montclair, CA. Detached ADU construction.

View Profile📞 (562) 832 8299
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#10G A CONSTRUCTION

Montclair, CA

G A Construction — licensed ADU contractor in Montclair, CA. Detached ADU construction. 8+ years experience.

View Profile📞 (619) 642 7098
View All 77 Contractors →

💰 How Much Does an ADU Cost in Montclair?

Garage Conversion

$73,500 - $133,500

Converting existing garage to living space

Detached ADU

$157,000 - $332,000

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 Montclair contractors to compare pricing.

❓ Frequently Asked Questions About ADUs in Montclair

How much does it cost to build an ADU in Montclair?▼
The average cost to build an ADU in Montclair ranges from $157,000 to $332,000, or approximately $207 to $382 per square foot. Garage conversions typically cost $73,500 to $133,500.
How long does it take to get an ADU permit in Montclair?▼
The ADU permit process in Montclair 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 Montclair?▼
In Montclair, 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 Montclair?▼
Montclair 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 Montclair?▼
No parking is required for ADUs in Montclair 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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