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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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#1LARA HOME REMODEL LLC

Wilmington, CA

Lara Home Remodel Llc — licensed ADU contractor in Wilmington, CA. Detached ADU construction. 5+ years experience.

View Profile📞 (310) 347 1036
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#2ALL TYPES GLASS AND MIRROR

Wilmington, CA

All Types Glass And Mirror — licensed ADU contractor in Wilmington, CA. Detached ADU construction. 37+ years experience.

View Profile📞 (310) 819 2630
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#3ENVISION PROPERTY BUILDERS INC

Wilmington, CA

Envision Property Builders Inc — licensed ADU contractor in Wilmington, CA. Detached ADU construction.

View Profile📞 (310) 427 9616
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#4SMART ENTRY SYSTEM

Wilmington, CA

Smart Entry System — licensed ADU contractor in Wilmington, CA. Detached ADU construction. 32+ years experience.

View Profile📞 (310) 630 9199
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#5CARLOS CONSTRUCTION

Wilmington, CA

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

View Profile📞 (310) 720 4119
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#6Q GENERAL CONSTRUCTION

Wilmington, CA

Q General Construction — licensed ADU contractor in Wilmington, CA. Detached ADU construction. 7+ years experience.

View Profile📞 (310) 947 6791
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#7PAL CONSTRUCTION AND RESTORATION INC

Wilmington, CA

Pal Construction And Restoration Inc — licensed ADU contractor in Wilmington, CA. Detached ADU construction. 5+ years experience.

View Profile📞 (833) 372 5462
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#8GARCIA MARTINEZ JOSE ANTONIO

Wilmington, CA

Garcia Martinez Jose Antonio — licensed ADU contractor in Wilmington, CA. Detached ADU construction. 11+ years experience.

View Profile📞 (310) 906 6094
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#9DESIGN BUILD AMERICA INC

Wilmington, CA

Design Build America Inc — licensed ADU contractor in Wilmington, CA. Detached ADU construction.

View Profile📞 (424) 489 2283
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#10FERNANDO CONSTRUCTION

Wilmington, CA

Fernando Construction — licensed ADU contractor in Wilmington, CA. Detached ADU construction. 21+ years experience.

View Profile📞 (310) 261 4181
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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