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ADU Builders & Contractors in Topanga, CA

Building an ADU in Topanga? You'll find 52 licensed contractors in the area, ready to help. Topanga's ADU market continues to grow as homeowners invest in additional living space, rental income, and multi-generational housing.

📊 ADU Quick Facts for Topanga

Avg. Cost/sqft

$194-$369

Permit Timeline

60-120 weeks

Max Size

1200 sqft

Setbacks

4ft sides

Top 52 ADU Contractors in Topanga

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#1HANSON DOUG CONSTRUCTION

Topanga, CA

Hanson Doug Construction — licensed ADU contractor in Topanga, CA. Detached ADU construction. 20+ years experience.

View Profile📞 (818) 430 7782
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#2SOUND STRUCTURES INC

Topanga, CA

Sound Structures Inc — licensed ADU contractor in Topanga, CA. Detached ADU construction. 17+ years experience.

View Profile📞 (415) 308 2098
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#3ASHBY S MALGORZATA

Topanga, CA

Ashby S Malgorzata — licensed ADU contractor in Topanga, CA. Detached ADU construction. 21+ years experience.

View Profile📞 (310) 849 2973
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#4DILLAWAY RONALD C

Topanga, CA

Dillaway Ronald C — licensed ADU contractor in Topanga, CA. Detached ADU construction. 44+ years experience.

View Profile📞 (310) 948 6567
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#5BOURGET CONSTRUCTION

Topanga, CA

Bourget Construction — licensed ADU contractor in Topanga, CA. Detached ADU construction. 49+ years experience.

View Profile📞 (310) 455 4015
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#6BROSIUS GRANT CONSTRUCTION

Topanga, CA

Brosius Grant Construction — licensed ADU contractor in Topanga, CA. Detached ADU construction. 33+ years experience.

View Profile📞 (310) 455 0582
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#7PB: TEKTON

Topanga, CA

PB: Tekton — licensed ADU contractor in Topanga, CA. Detached ADU construction. 13+ years experience.

View Profile📞 (323) 829 9039
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#8FREEMAN ALAN STUART

Topanga, CA

Freeman Alan Stuart — licensed ADU contractor in Topanga, CA. Detached ADU construction. 24+ years experience.

View Profile📞 (310) 592 5377
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#9PARKER CONSTRUCTION

Topanga, CA

Parker Construction — licensed ADU contractor in Topanga, CA. Detached ADU construction. 18+ years experience.

View Profile📞 (213) 618 9742
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#10BORLAND CONSTRUCTION

Topanga, CA

Borland Construction — licensed ADU contractor in Topanga, CA. Detached ADU construction. 35+ years experience.

View Profile📞 (310) 721 7559
View All 52 Contractors →

💰 How Much Does an ADU Cost in Topanga?

Garage Conversion

$67,000 - $127,000

Converting existing garage to living space

Detached ADU

$144,000 - $319,000

New standalone unit (600-1,200 sqft)

Permit & Fees

$1,111 - $5,111

Plan check, permits, utility connections

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

❓ Frequently Asked Questions About ADUs in Topanga

How much does it cost to build an ADU in Topanga?▼
The average cost to build an ADU in Topanga ranges from $144,000 to $319,000, or approximately $194 to $369 per square foot. Garage conversions typically cost $67,000 to $127,000.
How long does it take to get an ADU permit in Topanga?▼
The ADU permit process in Topanga 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 Topanga?▼
In Topanga, 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 Topanga?▼
Topanga 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 Topanga?▼
No parking is required for ADUs in Topanga 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

Los Angeles (3215)San Diego (2582)San Francisco (2170)Sacramento (1551)Riverside (925)Fresno (904)Anaheim (784)Irvine (760)

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