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ADU Builders & Contractors in Wilmington, CA

Wilmington, CA homeowners looking to build an ADU have 51 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 Wilmington starts here.

📊 ADU Quick Facts for Wilmington

Avg. Cost/sqft

$197-$372

Permit Timeline

60-120 weeks

Max Size

1200 sqft

Setbacks

4ft sides

Top 51 ADU Contractors in Wilmington

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#1BLUE CROW CONSTRUCTION

Wilmington, CA

Blue Crow Construction — licensed ADU contractor in Wilmington, CA. Detached ADU construction.

View Profile📞 (858) 649 9379
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#2JARAMILLO'S CONSTRUCTION INC

Wilmington, CA

Jaramillo'S Construction Inc — licensed ADU contractor in Wilmington, CA. Detached ADU construction.

View Profile📞 (310) 427 0683
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#3TENZERA BRUNO INC

Wilmington, CA

Tenzera Bruno Inc — licensed ADU contractor in Wilmington, CA. Detached ADU construction. 17+ years experience.

View Profile📞 (310) 830 6990
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#4JCM CONSTRUCTION GROUP INC

Wilmington, CA

Jcm Construction Group Inc — licensed ADU contractor in Wilmington, CA. Detached ADU construction. 5+ years experience.

View Profile📞 (310) 748 4299
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#5MAYNEZ CONSTRUCTION COMPANY

Wilmington, CA

Maynez Construction Company — licensed ADU contractor in Wilmington, CA. Detached ADU construction. 37+ years experience.

View Profile📞 (310) 466 3224
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#6LOMA CONSTRUCTION COMPANY INC

Wilmington, CA

Loma Construction Company Inc — licensed ADU contractor in Wilmington, CA. Detached ADU construction.

View Profile📞 (562) 308 0634
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#7DUARTE JOSE LUIS

Wilmington, CA

Duarte Jose Luis — licensed ADU contractor in Wilmington, CA. Detached ADU construction. 6+ years experience.

View Profile📞 (310) 547 7099
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#8INVERSE INC

Wilmington, CA

Inverse Inc — licensed ADU contractor in Wilmington, CA. Detached ADU construction.

View Profile📞 (424) 287 0848
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#9AMORE DESIGN INC

Wilmington, CA

Amore Design Inc — licensed ADU contractor in Wilmington, CA. Detached ADU construction. 13+ years experience.

View Profile📞 (310) 847 7717
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#10HIGHTECH CONSTRUCTION SOLUTIONS

Wilmington, CA

Hightech Construction Solutions — licensed ADU contractor in Wilmington, CA. Detached ADU construction. 19+ years experience.

View Profile📞 (714) 699 8583
View All 51 Contractors →

💰 How Much Does an ADU Cost in Wilmington?

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

$1,105 - $5,105

Plan check, permits, utility connections

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

❓ Frequently Asked Questions About ADUs in Wilmington

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