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ADU Builders in Norwalk, CA

14 builders · ranked by Google rating and review volume · 4 CSLB license verified

★ Featured ADU builder

Featured ADU builder — this spot is open

Put your ADU company at the top of this page, in front of Norwalk homeowners who are comparing builders right now. Includes your logo, project photos, a direct call button and a link to your website.

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Located in Los Angeles County, Norwalk had a 2020 Census population of about 102,773. We found 14 ADU builders and contractors that show up for Norwalk homeowners on Google Maps, 1 of them based in the city itself. Their average Google rating is 4.8 stars. 11 market themselves specifically as ADU builders, and 3 mention garage conversions. 4 have a matched, active CSLB license shown with a verified badge. The top-rated by our review-weighted score are Domus Design Build, Ga Design Build and Tech Master Construction Inc.

Los Angeles leads California in ADU permits. Common projects here include garage conversions on older lots, detached backyard units on deep lots, and hillside sites where access and grading drive the cost.

#2

Ga Design Build

4.9 (29 Google reviews)

16226 Clark Ave, Bellflower, CA 90706

Serves Norwalk · based in Bellflower
Design-buildRemodels & additionsHome builderGeneral contractor
CallWebsiteView profile
#7

NewGen ADU Builders

5.0 (7 Google reviews)
✔ CSLB License Verified #1087166

18000 Studebaker Rd #700, Cerritos, CA 90703

Serves Norwalk · based in Cerritos
ADU specialistHome builder
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#14

Buena Park ADU

No rating yet (0 Google reviews)

6925 Aragon Cir, Buena Park, CA 90620

Serves Norwalk · based in Buena Park
ADU specialistHome builder
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Permits and pre-approved plans in Norwalk

ADU permits in Norwalk go through the city's building or planning department. Under AB 1332, every California city and county had to set up a pre-approved ADU plan program by January 1, 2025, so ask Norwalk whether it has approved plans you can use. See our pre-approved plans guide and California ADU law summary.

Planning an ADU in Norwalk? Start here

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Norwalk ADU FAQ

How many ADU builders serve Norwalk?

Our directory lists 14 ADU builders and contractors that appear for Norwalk on Google Maps, including companies based in nearby Los Angeles County communities.

Do I need a permit to build an ADU in Norwalk?

Yes. ADUs need a building permit from the City of Norwalk, which must approve or deny a complete application within 60 days under state law. Many cities also offer pre-approved plans that speed up review.

How much does an ADU cost in Norwalk?

Most Southern California detached ADUs land around $350 to $550 per square foot all-in, garage conversions around $200 to $350, and JADUs around $50,000 to $150,000. Use our ADU cost estimator and get three itemized bids.

How are Norwalk ADU builders ranked here?

By Google rating weighted by the number of reviews, so a 4.9 with 200 reviews ranks above a 5.0 with 3. Featured placements are clearly labeled and don't affect the organic ranking.

Nearby cities in Los Angeles County

Los Angeles 118Long Beach 119Santa Clarita 27Glendale 117Lancaster 12Palmdale 12Pomona 67Torrance 98Pasadena 100Downey 28West Covina 68El Monte 24
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