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ADU Builders & Contractors in Monrovia, CA

Monrovia, CA is home to 132 ADU contractors ready to help. From initial permits to final inspection, these local professionals know Monrovia's building codes and can guide your project from concept to completion.

📊 ADU Quick Facts for Monrovia

Avg. Cost/sqft

$207-$382

Permit Timeline

60-120 weeks

Max Size

1200 sqft

Setbacks

4ft sides

Top 132 ADU Contractors in Monrovia

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#1A - CUSTOM DOOR & WINDOW

Monrovia, CA

A - Custom Door & Window — licensed ADU contractor in Monrovia, CA. Detached ADU construction. 26+ years experience.

View Profile📞 (818) 516 2104
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#2PENN DAVID W

Monrovia, CA

Penn David W — licensed ADU contractor in Monrovia, CA. Detached ADU construction. 37+ years experience.

View Profile📞 (626) 590 9548
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#3EATON CONSTRUCTION COMPANY INC

Monrovia, CA

Eaton Construction Company Inc — licensed ADU contractor in Monrovia, CA. Detached ADU construction. 37+ years experience.

View Profile📞 (626) 303 4113
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#4HOUSTON MARK ASSOCIATES INC

Monrovia, CA

Houston Mark Associates Inc — licensed ADU contractor in Monrovia, CA. Detached ADU construction. 19+ years experience.

View Profile📞 (626) 357 7858
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#5SIMPLIFIED HANDYMAN CONSTRUCTION SERVICES

Monrovia, CA

Simplified Handyman Construction Services — licensed ADU contractor in Monrovia, CA. Detached ADU construction.

View Profile📞 (626) 378 5892
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#6S P CONSTRUCTION

Monrovia, CA

S P Construction — licensed ADU contractor in Monrovia, CA. Detached ADU construction. 35+ years experience.

View Profile📞 (626) 483 6318
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#7HINKLEY JAMES

Monrovia, CA

Hinkley James — licensed ADU contractor in Monrovia, CA. Detached ADU construction. 26+ years experience.

View Profile📞 (818) 421 0920
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#8GOLDEN GIANT CONSTRUCTION INC

Monrovia, CA

Golden Giant Construction Inc — licensed ADU contractor in Monrovia, CA. Detached ADU construction. 19+ years experience.

View Profile📞 (626) 825 8667
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#9SAN GABRIEL VALLEY HABITAT FOR HUMANITY INC

Monrovia, CA

San Gabriel Valley Habitat For Humanity Inc — licensed ADU contractor in Monrovia, CA. Detached ADU construction. 15+ years experience.

View Profile📞 (626) 387 6899
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#10ROD CONSTRUCTION MANAGERS

Monrovia, CA

Rod Construction Managers — licensed ADU contractor in Monrovia, CA. Detached ADU construction. 32+ years experience.

View Profile📞 (626) 301 0880
View All 132 Contractors →

💰 How Much Does an ADU Cost in Monrovia?

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 Monrovia contractors to compare pricing.

❓ Frequently Asked Questions About ADUs in Monrovia

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