What is the maximum ADU size allowed in Orange?

Detached ADUs in Orange can be up to 1200 square feet.

ADU Builders & Contractors in Orange, CA

Q: How much does it cost to build an ADU in Orange?

The average cost ranges from $150,000 to $380,000, or $300-550 per square foot.

Q: How long does it take to get an ADU permit in Orange?

The permit process typically takes 4 to 10 weeks in Orange.

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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#1HOBBS R C COMPANY INC

Orange, CA

Hobbs R C Company Inc — licensed ADU contractor in Orange, CA. Detached ADU construction. 25+ years experience.

View Profile 📞 (714) 633 8100

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#2GREENCASTLE

Orange, CA

Greencastle — licensed ADU contractor in Orange, CA. Detached ADU construction. 16+ years experience.

View Profile 📞 (714) 333 8471

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#3PATEL ANAND

Orange, CA

Patel Anand — licensed ADU contractor in Orange, CA. Detached ADU construction. 21+ years experience.

View Profile 📞 (949) 413 4543

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#4METRO ENGINEERING INC

Orange, CA

Metro Engineering Inc — licensed ADU contractor in Orange, CA. Detached ADU construction. 7+ years experience.

View Profile 📞 (714) 353 7370

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#5IN-LINE CONSTRUCTION

Orange, CA

IN-Line Construction — licensed ADU contractor in Orange, CA. Detached ADU construction. 44+ years experience.

View Profile 📞 (949) 525 6570

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#6R E SCHULTZ CONSTRUCTION INC

Orange, CA

R E Schultz Construction Inc — licensed ADU contractor in Orange, CA. Detached ADU construction. 10+ years experience.

View Profile 📞 (714) 649 2627

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#7INFINITY BUILDERS INC

Orange, CA

Infinity Builders Inc — licensed ADU contractor in Orange, CA. Detached ADU construction. 6+ years experience.

View Profile 📞 (714) 321 9583

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#8CHURNOCK KEVIN E

Orange, CA

Churnock Kevin E — licensed ADU contractor in Orange, CA. Detached ADU construction. 42+ years experience.

View Profile 📞 (714) 458 8898

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#9CONSTRUCTION QUEST

Orange, CA

Construction Quest — licensed ADU contractor in Orange, CA. Detached ADU construction. 19+ years experience.

View Profile 📞 (714) 292 4648

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#10LUTKE CONSTRUCTION CORP

Orange, CA

Lutke Construction Corp — licensed ADU contractor in Orange, CA. Detached ADU construction. 14+ years experience.

View Profile 📞 (714) 602 6729

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

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

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