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ADU Builders & Contractors in Norwalk, CA

Building an ADU in Norwalk? You'll find 117 licensed contractors in the area, ready to help. Norwalk's ADU market continues to grow as homeowners invest in additional living space, rental income, and multi-generational housing.

📊 ADU Quick Facts for Norwalk

Avg. Cost/sqft

$208-$383

Permit Timeline

60-120 weeks

Max Size

1200 sqft

Setbacks

4ft sides

Top 117 ADU Contractors in Norwalk

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#1D J M COMMERCIAL CONSTRUCTION

Norwalk, CA

D J M Commercial Construction — licensed ADU contractor in Norwalk, CA. Detached ADU construction. 11+ years experience.

View Profile📞 (310) 704 0631
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#2CARE CONSTRUCTION SERVICES INC

Norwalk, CA

Care Construction Services Inc — licensed ADU contractor in Norwalk, CA. Detached ADU construction. 18+ years experience.

View Profile📞 (562) 404 7444
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#3HERRERA CONSTRUCTION & REMODELING

Norwalk, CA

Herrera Construction & Remodeling — licensed ADU contractor in Norwalk, CA. Detached ADU construction. 16+ years experience.

View Profile📞 (323) 377 0347
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#4CONSTRUCTION 24/7

Norwalk, CA

Construction 24/7 — licensed ADU contractor in Norwalk, CA. Detached ADU construction. 31+ years experience.

View Profile📞 (818) 402 4000
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#5HAYES B L INC

Norwalk, CA

Hayes B L Inc — licensed ADU contractor in Norwalk, CA. Detached ADU construction. 30+ years experience.

View Profile📞 (562) 466 6100
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#6R & R CONTRACTORS LLC

Norwalk, CA

R & R Contractors Llc — licensed ADU contractor in Norwalk, CA. Detached ADU construction. 7+ years experience.

View Profile📞 (562) 802 3111
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#7ORTIZ BUILDING

Norwalk, CA

Ortiz Building — licensed ADU contractor in Norwalk, CA. Detached ADU construction.

View Profile📞 (562) 304 0803
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#8RENOVATORS INC THE

Norwalk, CA

Renovators Inc The — licensed ADU contractor in Norwalk, CA. Detached ADU construction. 39+ years experience.

View Profile📞 (562) 355 7704
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#9HANA CONSTRUCTION

Norwalk, CA

Hana Construction — licensed ADU contractor in Norwalk, CA. Detached ADU construction. 36+ years experience.

View Profile📞 (213) 700 1920
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#10A C CONSTRUCTION

Norwalk, CA

A C Construction — licensed ADU contractor in Norwalk, CA. Detached ADU construction. 21+ years experience.

View Profile📞 (562) 355 7272
View All 117 Contractors →

💰 How Much Does an ADU Cost in Norwalk?

Garage Conversion

$74,000 - $134,000

Converting existing garage to living space

Detached ADU

$158,000 - $333,000

New standalone unit (600-1,200 sqft)

Permit & Fees

$1,111 - $5,111

Plan check, permits, utility connections

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

❓ Frequently Asked Questions About ADUs in Norwalk

How much does it cost to build an ADU in Norwalk?▼
The average cost to build an ADU in Norwalk ranges from $158,000 to $333,000, or approximately $208 to $383 per square foot. Garage conversions typically cost $74,000 to $134,000.
How long does it take to get an ADU permit in Norwalk?▼
The ADU permit process in Norwalk 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 Norwalk?▼
In Norwalk, 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 Norwalk?▼
Norwalk 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 Norwalk?▼
No parking is required for ADUs in Norwalk 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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