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ADU Builders in Whittier, CA

62 builders · ranked by Google rating and review volume · 29 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 Whittier 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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With roughly 87,306 residents at the 2020 Census, Whittier is one of Los Angeles County's established communities. We found 62 ADU builders and contractors that show up for Whittier homeowners on Google Maps, 7 of them based in the city itself. Their average Google rating is 4.7 stars. 32 market themselves specifically as ADU builders, and 6 mention garage conversions. 29 have a matched, active CSLB license shown with a verified badge. The top-rated by our review-weighted score are Luctor Company, Zenith Builder and Domus Design Build.

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

Zenith Builder

5.0 (46 Google reviews)
✔ CSLB License Verified #1035285

Service-area business · Temple City

Serves Whittier · based in Temple City
Remodels & additions
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#4

Hybrid Renovations

4.9 (162 Google reviews)
✔ CSLB License Verified #1134177

10350 Heritage Park Dr Ste 204, Santa Fe Springs, CA 90670

Serves Whittier · based in Santa Fe Springs
Remodels & additionsGeneral contractor
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#10

Ga Design Build

4.9 (29 Google reviews)

16226 Clark Ave, Bellflower, CA 90706

Serves Whittier · based in Bellflower
Design-buildRemodels & additionsHome builderGeneral contractor
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#23

NewGen ADU Builders

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

18000 Studebaker Rd #700, Cerritos, CA 90703

Serves Whittier · based in Cerritos
ADU specialistHome builder
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#27

The ADU Company

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

504 E Navilla Pl, Covina, CA 91723

Serves Whittier · based in Covina
ADU specialistRemodels & additionsHome builderGeneral contractor
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#28

Casas Construction

5.0 (6 Google reviews)
✔ CSLB License Verified #1101290

2181 S Atlantic Blvd Ste 212, Commerce, CA 90040

Serves Whittier · based in Commerce
Remodels & additionsHome builderGeneral contractor
CallWebsiteView profile
#35

A.D.U. Builders

5.0 (2 Google reviews)
✔ CSLB License Verified #1080549

217 E Victoria Ave, Montebello, CA 90640

Serves Whittier · based in Montebello
ADU specialist
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#39

KoBolt Construction

4.6 (11 Google reviews)
✔ CSLB License Verified #1024785

406 E Commonwealth Ave #3, Fullerton, CA 92832

Serves Whittier · based in Fullerton
Remodels & additionsHome builderGeneral contractor
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#51

Expert Home Builders

4.4 (304 Google reviews)
✔ CSLB License Verified #1056600

5800 S Eastern Ave Suit 500, Commerce, CA 90040

Serves Whittier · based in Commerce
Home builderGeneral contractor
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#53

Apex Construction

3.7 (6 Google reviews)
✔ CSLB License Verified #1020301

Service-area business · La Habra

Serves Whittier · based in La Habra
ADU specialistRemodels & additionsGeneral contractor
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#54

CalHome ADU

1.0 (1 Google reviews)

2540 Fulton Rd, Pomona, CA 91767

Serves Whittier · based in Pomona
ADU specialistGeneral contractor
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#57

Buena Park ADU

No rating yet (0 Google reviews)

6925 Aragon Cir, Buena Park, CA 90620

Serves Whittier · based in Buena Park
ADU specialistHome builder
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#59

ADU

No rating yet (0 Google reviews)

13809 Actina Ave, Bellflower, CA 90706

Serves Whittier · based in Bellflower
ADU specialist
View profile
#60

JLF ADU

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

4716 N Fircroft Ave, Covina, CA 91722

Serves Whittier · based in Covina
ADU specialist
CallWebsiteView profile
#62

Robles Inc ADU

No rating yet (0 Google reviews)

Service-area business · La Puente

Serves Whittier · based in La Puente
ADU specialist
CallView profile

Permits and pre-approved plans in Whittier

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

Planning an ADU in Whittier? Start here

Garage Conversion ADU Cost in Southern California (and What Drives It)AB 1033: Can You Sell an ADU Separately in California?ADU Rental Income and Property Taxes in California: What to ExpectThe ADU Permit Process in California: Step by Step (2026)

All ADU guides →

Whittier ADU FAQ

How many ADU builders serve Whittier?

Our directory lists 62 ADU builders and contractors that appear for Whittier on Google Maps, including companies based in nearby Los Angeles County communities.

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

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

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 Whittier 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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