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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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#1CUSTOM DESIGN GENERAL CONSTRUCTION INC

Whittier, CA

Custom Design General Construction Inc — licensed ADU contractor in Whittier, CA. Detached ADU construction. 7+ years experience.

View Profile📞 (562) 745 7833
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#2PEEK CONSTRUCTION

Whittier, CA

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

View Profile📞 (714) 488 4974
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#3PINNACLE BUILDING STRUCTURE

Whittier, CA

Pinnacle Building Structure — licensed ADU contractor in Whittier, CA. Detached ADU construction. 47+ years experience.

View Profile📞 (562) 965 3551
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#4STRONG HOLD BUILDERS

Whittier, CA

Strong Hold Builders — licensed ADU contractor in Whittier, CA. Detached ADU construction. 13+ years experience.

View Profile📞 (562) 682 0959
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#5AG BUILDERS INC

Whittier, CA

AG Builders Inc — licensed ADU contractor in Whittier, CA. Detached ADU construction. 12+ years experience.

View Profile📞 (562) 500 7185
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#6PIPING SERVICE INC

Whittier, CA

Piping Service Inc — licensed ADU contractor in Whittier, CA. Detached ADU construction. 10+ years experience.

View Profile📞 (562) 945 4169
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#7PREMIER CONSTRUCTION DESIGNS

Whittier, CA

Premier Construction Designs — licensed ADU contractor in Whittier, CA. Detached ADU construction.

View Profile📞 (562) 292 3969
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#8ONE HEART GENERAL CONSTRUCTION

Whittier, CA

One Heart General Construction — licensed ADU contractor in Whittier, CA. Detached ADU construction.

View Profile📞 (213) 800 1308
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#9H & H RESIDENTIAL CONSTRUCTION CORP

Whittier, CA

H & H Residential Construction Corp — licensed ADU contractor in Whittier, CA. Detached ADU construction.

View Profile📞 (562) 587 4157
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#10FITZPATRICK GENERAL SERVICE

Whittier, CA

Fitzpatrick General Service — licensed ADU contractor in Whittier, CA. Detached ADU construction.

View Profile📞 (951) 852 8038
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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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