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ADU Builders & Contractors in Whittier, CA

Whittier, CA homeowners looking to build an ADU have 300 licensed contractors to choose from, ready to help. Whether you're planning a garage conversion, detached ADU, or junior ADU, finding the right contractor in Whittier starts here.

📊 ADU Quick Facts for Whittier

Avg. Cost/sqft

$197-$372

Permit Timeline

60-120 weeks

Max Size

1200 sqft

Setbacks

4ft sides

Top 300 ADU Contractors in Whittier

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#1BENNETT BROOK MATTHEW

Whittier, CA

Bennett Brook Matthew — licensed ADU contractor in Whittier, CA. Detached ADU construction. 9+ years experience.

View Profile📞 (323) 674 3799
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#2MN CONSTRUCTION SERVICES

Whittier, CA

MN Construction Services — licensed ADU contractor in Whittier, CA. Detached ADU construction. 22+ years experience.

View Profile📞 (562) 242 6105
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#3A R CUSTOM BUILDER

Whittier, CA

A R Custom Builder — licensed ADU contractor in Whittier, CA. Detached ADU construction. 6+ years experience.

View Profile📞 (626) 705 4602
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#4PROMISED LAND CONSTRUCTION

Whittier, CA

Promised Land Construction — licensed ADU contractor in Whittier, CA. Detached ADU construction. 20+ years experience.

View Profile📞 (562) 307 1817
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#5MARMS CONSTRUCTION COMPANY INC

Whittier, CA

Marms Construction Company Inc — licensed ADU contractor in Whittier, CA. Detached ADU construction. 19+ years experience.

View Profile📞 (562) 358 2530
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#6SHAWN O'DONNELL DOORS AND CONSTRUCTION

Whittier, CA

Shawn O'Donnell Doors And Construction — licensed ADU contractor in Whittier, CA. Detached ADU construction. 21+ years experience.

View Profile📞 (562) 569 9416
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#7RINCON BUILDING SOLUTIONS

Whittier, CA

Rincon Building Solutions — licensed ADU contractor in Whittier, CA. Detached ADU construction. 6+ years experience.

View Profile📞 (562) 777 6853
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#8CORNERSTONE DEVELOPMENT

Whittier, CA

Cornerstone Development — licensed ADU contractor in Whittier, CA. Detached ADU construction. 28+ years experience.

View Profile📞 (213) 284 8542
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#9DANDURAND & SONS CONSTRUCTION CORPORATION

Whittier, CA

Dandurand & Sons Construction Corporation — licensed ADU contractor in Whittier, CA. Detached ADU construction. 12+ years experience.

View Profile📞 (562) 896 1437
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#10MIGUELANGELO DESIGNS

Whittier, CA

Miguelangelo Designs — licensed ADU contractor in Whittier, CA. Detached ADU construction. 14+ years experience.

View Profile📞 (562) 658 7341
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💰 How Much Does an ADU Cost in Whittier?

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

$1,104 - $5,104

Plan check, permits, utility connections

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

❓ Frequently Asked Questions About ADUs in Whittier

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