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ADU Builders & Contractors in Orange, CA

The City of Orange follows Orange County's moderate fee structure for ADU permits, with construction costs in line with the broader county average and strong rental demand from nearby university and business district tenants.

📊 ADU Quick Facts for Orange

Avg. Cost/sqft

$300-$550

Permit Timeline

4-10 weeks

Max Size

1200 sqft

Setbacks

4ft sides

View Orange Planning Department →

Top 533 ADU Contractors in Orange

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#1JAMES EVAN L

Orange, CA

James Evan L — licensed ADU contractor in Orange, CA. Detached ADU construction. 48+ years experience.

View Profile📞 (310) 488 0069
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#2RESCUE ROOFER

Orange, CA

Rescue Roofer — licensed ADU contractor in Orange, CA. Detached ADU construction.

View Profile📞 (714) 542 5222
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#3ZEBU CONTRACTORS

Orange, CA

Zebu Contractors — licensed ADU contractor in Orange, CA. Detached ADU construction.

View Profile📞 (626) 465 6362
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#4PROJECT BLUE CONSTRUCTION GROUP

Orange, CA

Project Blue Construction Group — licensed ADU contractor in Orange, CA. Detached ADU construction.

View Profile📞 (714) 473 4409
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#5J B 3 D

Orange, CA

J B 3 D — licensed ADU contractor in Orange, CA. Detached ADU construction. 17+ years experience.

View Profile📞 (714) 679 4324
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#6AUM SANG SUP

Orange, CA

Aum Sang Sup — licensed ADU contractor in Orange, CA. Detached ADU construction.

View Profile📞 (714) 397 4894
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#7AVALON CONSTRUCTION SERVICES

Orange, CA

Avalon Construction Services — licensed ADU contractor in Orange, CA. Detached ADU construction. 40+ years experience.

View Profile📞 (714) 403 7818
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#8HALL ROY C GENERAL CONTRACTOR INC

Orange, CA

Hall Roy C General Contractor Inc — licensed ADU contractor in Orange, CA. Detached ADU construction. 46+ years experience.

View Profile📞 (714) 222 4331
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#9SCULLY SHAWN BUILDING CONTRACTOR

Orange, CA

Scully Shawn Building Contractor — licensed ADU contractor in Orange, CA. Detached ADU construction. 17+ years experience.

View Profile📞 (949) 422 0229
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#10GALLA - RINI ROOFING INC

Orange, CA

Galla - Rini Roofing Inc — licensed ADU contractor in Orange, CA. Detached ADU construction. 33+ years experience.

View Profile📞 (714) 244 6567
View All 533 Contractors →

💰 How Much Does an ADU Cost in Orange?

Garage Conversion

$75,000 - $185,000

Converting existing garage to living space

Detached ADU

$150,000 - $380,000

New standalone unit (600-1,200 sqft)

Permit & Fees

$3,000 - $10,000

Plan check, permits, utility connections

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

❓ Frequently Asked Questions About ADUs in Orange

How much does it cost to build an ADU in Orange?▼
The average cost to build an ADU in Orange ranges from $150,000 to $380,000, or approximately $300 to $550 per square foot. Garage conversions typically cost $75,000 to $185,000.
How long does it take to get an ADU permit in Orange?▼
The ADU permit process in Orange typically takes 4 to 10 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 Orange?▼
In Orange, 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 Orange?▼
Orange 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 Orange?▼
No parking is required for ADUs in Orange 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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