ADU Contractors
Dashboard

ADU Builders & Contractors in Westchester, CA

With 7 verified ADU contractors serving Westchester, CA, homeowners have plenty of options for their accessory dwelling unit project. Local contractors ready to help specialize in everything from design-build to permit navigation.

📊 ADU Quick Facts for Westchester

Avg. Cost/sqft

$197-$372

Permit Timeline

60-120 weeks

Max Size

1200 sqft

Setbacks

4ft sides

Top 7 ADU Contractors in Westchester

🏗️
#1NAIRN CONSTRUCTION INC

Westchester, CA

Nairn Construction Inc — licensed ADU contractor in Westchester, CA. Detached ADU construction. 11+ years experience.

View Profile📞 (310) 490 4287
🏗️
#2PARKVIEW MANAGEMENT AND DEVELOPMENT COMPANY

Westchester, CA

Parkview Management And Development Company — licensed ADU contractor in Westchester, CA. Detached ADU construction. 18+ years experience.

View Profile📞 (310) 779 4748
🏗️
#3MUTUAL BUILDERS

Westchester, CA

Mutual Builders — licensed ADU contractor in Westchester, CA. Detached ADU construction. 36+ years experience.

View Profile📞 (310) 902 2885
🏗️
#4ENGEL CONSTRUCTION

Westchester, CA

Engel Construction — licensed ADU contractor in Westchester, CA. Detached ADU construction.

View Profile📞 (818) 404 1780
🏗️
#5CHRISTO DENNY

Westchester, CA

Christo Denny — licensed ADU contractor in Westchester, CA. Detached ADU construction. 27+ years experience.

View Profile📞 (310) 993 9597
🏗️
#6HUNGERFORD CONSTRUCTION

Westchester, CA

Hungerford Construction — licensed ADU contractor in Westchester, CA. Detached ADU construction. 40+ years experience.

View Profile📞 (818) 416 7607
🏗️
#7LARKIN JAMES

Westchester, CA

Larkin James — licensed ADU contractor in Westchester, CA. Detached ADU construction. 30+ years experience.

View Profile📞 (310) 508 4218

💰 How Much Does an ADU Cost in Westchester?

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

$1,101 - $5,101

Plan check, permits, utility connections

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

❓ Frequently Asked Questions About ADUs in Westchester

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

Ready to Build Your ADU in Westchester?

Get free quotes from top-rated local contractors

Find Contractors Now
← View all contractors in California