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ADU Builders & Contractors in Castaic, CA

Castaic, CA homeowners looking to build an ADU have 62 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 Castaic starts here.

📊 ADU Quick Facts for Castaic

Avg. Cost/sqft

$197-$372

Permit Timeline

60-120 weeks

Max Size

1200 sqft

Setbacks

4ft sides

Top 62 ADU Contractors in Castaic

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#1MILLER KRAIG EDGERTON

Castaic, CA

Miller Kraig Edgerton — licensed ADU contractor in Castaic, CA. Detached ADU construction. 44+ years experience.

View Profile📞 (818) 516 1143
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#2GARCIA BRANDON MATTHEW

Castaic, CA

Garcia Brandon Matthew — licensed ADU contractor in Castaic, CA. Detached ADU construction. 15+ years experience.

View Profile📞 (818) 425 2644
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#3BARTON CONSTRUCTION

Castaic, CA

Barton Construction — licensed ADU contractor in Castaic, CA. Detached ADU construction. 39+ years experience.

View Profile📞 (661) 877 5197
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#4HEATH GENERAL CONTRACTING INC

Castaic, CA

Heath General Contracting Inc — licensed ADU contractor in Castaic, CA. Detached ADU construction. 10+ years experience.

View Profile📞 (818) 425 6911
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#5ABERCROMBIE GENERAL ENGINEERING CONSTRUCTION COMPANY

Castaic, CA

Abercrombie General Engineering Construction Company — licensed ADU contractor in Castaic, CA. Detached ADU construction. 41+ years experience.

View Profile📞 (661) 600 2953
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#6SUPERIOR CONSTRUCTION AND LANDSCAPE

Castaic, CA

Superior Construction And Landscape — licensed ADU contractor in Castaic, CA. Detached ADU construction. 24+ years experience.

View Profile📞 (818) 838 0833
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#7CANYON VISTA BUILDERS

Castaic, CA

Canyon Vista Builders — licensed ADU contractor in Castaic, CA. Detached ADU construction. 30+ years experience.

View Profile📞 (818) 200 5134
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#8HIRED HAND CONSTRUCTION INC

Castaic, CA

Hired Hand Construction Inc — licensed ADU contractor in Castaic, CA. Detached ADU construction. 9+ years experience.

View Profile📞 (661) 510 9379
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#9ANT DESIGN INC

Castaic, CA

Ant Design Inc — licensed ADU contractor in Castaic, CA. Detached ADU construction.

View Profile📞 (661) 212 0808
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#10CHANDI JAGJIT SINGH

Castaic, CA

Chandi Jagjit Singh — licensed ADU contractor in Castaic, CA. Detached ADU construction.

View Profile📞 (661) 400 0601
View All 62 Contractors →

💰 How Much Does an ADU Cost in Castaic?

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

$1,097 - $5,097

Plan check, permits, utility connections

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

❓ Frequently Asked Questions About ADUs in Castaic

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