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ADU Builders & Contractors in Brea, CA

Building an ADU in Brea? You'll find 174 licensed contractors in the area, ready to help. Brea's ADU market continues to grow as homeowners invest in additional living space, rental income, and multi-generational housing.

📊 ADU Quick Facts for Brea

Avg. Cost/sqft

$196-$371

Permit Timeline

60-120 weeks

Max Size

1200 sqft

Setbacks

4ft sides

Top 174 ADU Contractors in Brea

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#1REGIONAL RESTORATION

Brea, CA

Regional Restoration — licensed ADU contractor in Brea, CA. Detached ADU construction. 34+ years experience.

View Profile📞 (714) 882 1625
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#2KPRS CONSTRUCTION SERVICES LLC

Brea, CA

Kprs Construction Services Llc — licensed ADU contractor in Brea, CA. Detached ADU construction. 27+ years experience.

View Profile📞 (714) 672 0800
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#3TRANE U S INC

Brea, CA

Trane U S Inc — licensed ADU contractor in Brea, CA. Detached ADU construction. 5+ years experience.

View Profile📞 (888) 973 9005
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#4ADU DESIGNERS & BUILDERS

Brea, CA

Adu Designers & Builders — licensed ADU contractor in Brea, CA. Detached ADU construction. 17+ years experience.

View Profile📞 (949) 279 7410
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#5SIN - FIN DESIGN / BUILD

Brea, CA

Sin - Fin Design / Build — licensed ADU contractor in Brea, CA. Detached ADU construction. 20+ years experience.

View Profile📞 (562) 359 8196
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#6INEX BUILDERS

Brea, CA

Inex Builders — licensed ADU contractor in Brea, CA. Detached ADU construction. 9+ years experience.

View Profile📞 (213) 268 9661
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#7DESIGN PLUS 2000 INC

Brea, CA

Design Plus 2000 Inc — licensed ADU contractor in Brea, CA. Detached ADU construction. 20+ years experience.

View Profile📞 (714) 396 6519
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#8GRIFFITH-ATKINSON JV

Brea, CA

Griffith-Atkinson JV — licensed ADU contractor in Brea, CA. Detached ADU construction. 5+ years experience.

View Profile📞 (714) 984 5500
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#9UNITED TRADES CONSTRUCTION INC

Brea, CA

United Trades Construction Inc — licensed ADU contractor in Brea, CA. Detached ADU construction. 9+ years experience.

View Profile📞 (714) 561 6119
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#10ALKHREISHA MOHANAD

Brea, CA

Alkhreisha Mohanad — licensed ADU contractor in Brea, CA. Detached ADU construction.

View Profile📞 (714) 336 6633
View All 174 Contractors →

💰 How Much Does an ADU Cost in Brea?

Garage Conversion

$68,000 - $128,000

Converting existing garage to living space

Detached ADU

$146,000 - $321,000

New standalone unit (600-1,200 sqft)

Permit & Fees

$1,114 - $5,114

Plan check, permits, utility connections

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

❓ Frequently Asked Questions About ADUs in Brea

How much does it cost to build an ADU in Brea?▼
The average cost to build an ADU in Brea ranges from $146,000 to $321,000, or approximately $196 to $371 per square foot. Garage conversions typically cost $68,000 to $128,000.
How long does it take to get an ADU permit in Brea?▼
The ADU permit process in Brea 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 Brea?▼
In Brea, 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 Brea?▼
Brea 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 Brea?▼
No parking is required for ADUs in Brea 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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