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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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#1VALOIS RAYMOND

Castaic, CA

Valois Raymond — licensed ADU contractor in Castaic, CA. Detached ADU construction. 46+ years experience.

View Profile📞 (909) 816 0054
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#2G D B GROUP

Castaic, CA

G D B Group — licensed ADU contractor in Castaic, CA. Detached ADU construction. 18+ years experience.

View Profile📞 (206) 317 1768
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#3NESBIT CONSTRUCTION

Castaic, CA

Nesbit Construction — licensed ADU contractor in Castaic, CA. Detached ADU construction. 8+ years experience.

View Profile📞 (805) 844 4855
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#4LR ELECTRICAL SOLUTIONS LLC

Castaic, CA

LR Electrical Solutions Llc — licensed ADU contractor in Castaic, CA. Detached ADU construction. 23+ years experience.

View Profile📞 (818) 486 9252
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#5VERITAS BUILDING COMPANY

Castaic, CA

Veritas Building Company — licensed ADU contractor in Castaic, CA. Detached ADU construction. 7+ years experience.

View Profile📞 (661) 200 0598
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#6SUMMIT BUILDERS

Castaic, CA

Summit Builders — licensed ADU contractor in Castaic, CA. Detached ADU construction. 41+ years experience.

View Profile📞 (805) 358 6456
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#7POLO DANIEL

Castaic, CA

Polo Daniel — licensed ADU contractor in Castaic, CA. Detached ADU construction. 7+ years experience.

View Profile📞 (213) 595 2233
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#8CITY LIGHT CONSTRUCTION

Castaic, CA

City Light Construction — licensed ADU contractor in Castaic, CA. Detached ADU construction. 38+ years experience.

View Profile📞 (800) 399 8242
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#9JDW GENERAL CONTRACTOR

Castaic, CA

Jdw General Contractor — licensed ADU contractor in Castaic, CA. Detached ADU construction.

View Profile📞 (661) 313 1239
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#10JETTERS ONLY

Castaic, CA

Jetters Only — licensed ADU contractor in Castaic, CA. Detached ADU construction. 17+ years experience.

View Profile📞 (818) 845 0308
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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