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ADU Builders & Contractors in Claremont, CA

With 82 verified ADU contractors serving Claremont, 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 Claremont

Avg. Cost/sqft

$197-$372

Permit Timeline

60-120 weeks

Max Size

1200 sqft

Setbacks

4ft sides

Top 82 ADU Contractors in Claremont

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#1STEELMAN BUILD & CONSTRUCTION INCORPORATED

Claremont, CA

Steelman Build & Construction Incorporated — licensed ADU contractor in Claremont, CA. Detached ADU construction. 8+ years experience.

View Profile📞 (562) 500 6772
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#2HERITAGE CONSTRUCTION SPECIALIST INC

Claremont, CA

Heritage Construction Specialist Inc — licensed ADU contractor in Claremont, CA. Detached ADU construction.

View Profile📞 (626) 375 1050
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#3CALGREEN DEVELOPMENT

Claremont, CA

Calgreen Development — licensed ADU contractor in Claremont, CA. Detached ADU construction.

View Profile📞 (213) 272 5505
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#4ARMIENTI DESIGN-BUILD INC

Claremont, CA

Armienti Design-Build Inc — licensed ADU contractor in Claremont, CA. Detached ADU construction.

View Profile📞 (213) 305 4181
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#5J S R & ASSOCIATES INC

Claremont, CA

J S R & Associates Inc — licensed ADU contractor in Claremont, CA. Detached ADU construction. 41+ years experience.

View Profile📞 (818) 370 0534
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#6HARTMAN BALDWIN INC

Claremont, CA

Hartman Baldwin Inc — licensed ADU contractor in Claremont, CA. Detached ADU construction. 33+ years experience.

View Profile📞 (909) 670 1316
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#7HUYNH THANG

Claremont, CA

Huynh Thang — licensed ADU contractor in Claremont, CA. Detached ADU construction. 37+ years experience.

View Profile📞 (626) 315 6329
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#8KNR DESIGN BUILD INC

Claremont, CA

Knr Design Build Inc — licensed ADU contractor in Claremont, CA. Detached ADU construction. 6+ years experience.

View Profile📞 (909) 727 2500
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#9TAMCODESIGNS INC

Claremont, CA

Tamcodesigns Inc — licensed ADU contractor in Claremont, CA. Detached ADU construction. 6+ years experience.

View Profile📞 (626) 216 5550
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#10HOFFMAN ELECTRIC INC

Claremont, CA

Hoffman Electric Inc — licensed ADU contractor in Claremont, CA. Detached ADU construction. 20+ years experience.

View Profile📞 (818) 640 0174
View All 82 Contractors →

💰 How Much Does an ADU Cost in Claremont?

Garage Conversion

$68,500 - $128,500

Converting existing garage to living space

Detached ADU

$147,000 - $322,000

New standalone unit (600-1,200 sqft)

Permit & Fees

$1,108 - $5,108

Plan check, permits, utility connections

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

❓ Frequently Asked Questions About ADUs in Claremont

How much does it cost to build an ADU in Claremont?▼
The average cost to build an ADU in Claremont ranges from $147,000 to $322,000, or approximately $197 to $372 per square foot. Garage conversions typically cost $68,500 to $128,500.
How long does it take to get an ADU permit in Claremont?▼
The ADU permit process in Claremont 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 Claremont?▼
In Claremont, 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 Claremont?▼
Claremont 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 Claremont?▼
No parking is required for ADUs in Claremont 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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