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ADU Builders in Duarte, CA

23 builders · ranked by Google rating and review volume · 11 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 Duarte 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, Duarte had a 2020 Census population of about 21,727. We found 23 ADU builders and contractors that show up for Duarte homeowners on Google Maps, 1 of them based in the city itself. Their average Google rating is 4.8 stars. 7 market themselves specifically as ADU builders. 11 have a matched, active CSLB license shown with a verified badge. The top-rated by our review-weighted score are Ramirez Drywall & Taping, D G Custom Construction & Electrical Inc and Easy Builders Construction.

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.

#6

The ADU Company

5.0 (6 Google reviews)
✔ CSLB License Verified #1118354

504 E Navilla Pl, Covina, CA 91723

Serves Duarte · based in Covina
ADU specialistRemodels & additionsHome builderGeneral contractor
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#19

JLF ADU

No rating yet (0 Google reviews)
✔ CSLB License Verified #1075968

4716 N Fircroft Ave, Covina, CA 91722

Serves Duarte · based in Covina
ADU specialist
CallWebsiteView profile
#22

ADU Express

No rating yet (0 Google reviews)

Service-area business · Duarte

Serves Duarte · based in Duarte
ADU specialist
CallView profile

Permits and pre-approved plans in Duarte

ADU permits in Duarte 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 Duarte whether it has approved plans you can use. See our pre-approved plans guide and California ADU law summary.

Planning an ADU in Duarte? Start here

ADU Rental Income and Property Taxes in California: What to ExpectPrefab and Modular ADUs in California: Real Costs, Permits and PitfallsGarage Conversion ADU Cost in Southern California (and What Drives It)How to Legalize an Unpermitted ADU in California (AB 2533)

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Duarte ADU FAQ

How many ADU builders serve Duarte?

Our directory lists 23 ADU builders and contractors that appear for Duarte on Google Maps, including companies based in nearby Los Angeles County communities.

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

Yes. ADUs need a building permit from the City of Duarte, 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 Duarte?

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 Duarte 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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