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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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#1M B ELECTRIC

Wilmington, CA

M B Electric — licensed ADU contractor in Wilmington, CA. Detached ADU construction. 18+ years experience.

View Profile📞 (310) 650 3498
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#2LOZA BUILD

Wilmington, CA

Loza Build — licensed ADU contractor in Wilmington, CA. Detached ADU construction. 17+ years experience.

View Profile📞 (310) 261 5160
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#3GCD PAINTING

Wilmington, CA

Gcd Painting — licensed ADU contractor in Wilmington, CA. Detached ADU construction.

View Profile📞 (310) 245 7358
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#4WARYS CONSTRUCTION

Wilmington, CA

Warys Construction — licensed ADU contractor in Wilmington, CA. Detached ADU construction. 17+ years experience.

View Profile📞 (310) 489 5744
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#5RFM GENERAL CONSTRUCTION INC

Wilmington, CA

Rfm General Construction Inc — licensed ADU contractor in Wilmington, CA. Detached ADU construction. 31+ years experience.

View Profile📞 (310) 629 1645
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#6GRAN C D O CONSTRUCTION INC

Wilmington, CA

Gran C D O Construction Inc — licensed ADU contractor in Wilmington, CA. Detached ADU construction. 17+ years experience.

View Profile📞 (424) 224 8577
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#7GB BUILDERS INC

Wilmington, CA

GB Builders Inc — licensed ADU contractor in Wilmington, CA. Detached ADU construction. 10+ years experience.

View Profile📞 (424) 263 1213
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#8J M E CONSTRUCTION

Wilmington, CA

J M E Construction — licensed ADU contractor in Wilmington, CA. Detached ADU construction. 17+ years experience.

View Profile📞 (323) 828 7619
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#9FLORES WINDOWS & DOORS

Wilmington, CA

Flores Windows & Doors — licensed ADU contractor in Wilmington, CA. Detached ADU construction. 16+ years experience.

View Profile📞 (310) 650 2815
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#10SAN PEDRO SIGN COMPANY

Wilmington, CA

San Pedro Sign Company — licensed ADU contractor in Wilmington, CA. Detached ADU construction. 48+ years experience.

View Profile📞 (310) 549 4661
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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