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ADU Builders in Alhambra, CA

49 builders · ranked by Google rating and review volume · 20 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 Alhambra 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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Alhambra is home to about 82,868 people (2020 Census) in Los Angeles County. We found 49 ADU builders and contractors that show up for Alhambra homeowners on Google Maps, 4 of them based in the city itself. Their average Google rating is 4.8 stars. 9 market themselves specifically as ADU builders, and 1 mention garage conversions. 20 have a matched, active CSLB license shown with a verified badge. The top-rated by our review-weighted score are Coronado Construction Company Inc, Zenith Builder and CAP Angeles 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

Zenith Builder

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

Service-area business · Temple City

Serves Alhambra · based in Temple City
Remodels & additions
CallWebsiteView profile
#4

Willbii Inc.

5.0 (22 Google reviews)
✔ CSLB License Verified #1108001

2158 Huntington Dr, San Marino, CA 91108

Serves Alhambra · based in San Marino
Remodels & additionsHome builderGeneral contractor
CallWebsiteView profile
#5

Teamup Construction

5.0 (17 Google reviews)
✔ CSLB License Verified #1134224

35 N Lake Ave #710, Pasadena, CA 91101

Serves Alhambra · based in Pasadena
Remodels & additionsHome builderGeneral contractor
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#13

Nott & Associates

5.0 (8 Google reviews)
✔ CSLB License Verified #746905

1508 Mission St, South Pasadena, CA 91030

Serves Alhambra · based in South Pasadena
Remodels & additionsHome builderGeneral contractor
CallWebsiteView profile
#16

LUDIS INC

5.0 (7 Google reviews)
✔ CSLB License Verified #1061815

15 E McLean St, Alhambra, CA 91801

Based in Alhambra
Remodels & additionsHome builderGeneral contractor
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#26

BUILDER 20 INC

5.0 (3 Google reviews)
✔ CSLB License Verified #1023066

1817 N Ave 56, Los Angeles, CA 90042

Serves Alhambra · based in Los Angeles
General contractor
CallWebsiteView profile
#31

LYF Design & Development Inc

5.0 (2 Google reviews)
✔ CSLB License Verified #1072862

1201 W Huntington Dr Unit 208, Arcadia, CA 91007

Serves Alhambra · based in Arcadia
General contractor
View profile
#34

MiLar Design & Build

4.7 (3 Google reviews)
✔ CSLB License Verified #1152747

812 Fremont Ave, South Pasadena, CA 91030

Serves Alhambra · based in South Pasadena
Design-buildRemodels & additions
CallWebsiteView profile

Permits and pre-approved plans in Alhambra

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

Planning an ADU in Alhambra? Start here

SB 9 vs ADU: Lot Splits, Duplexes and Backyard Units in CaliforniaPrefab and Modular ADUs in California: Real Costs, Permits and PitfallsJADU vs ADU in California: Size, Rules, Cost and Which to BuildHow to Legalize an Unpermitted ADU in California (AB 2533)

All ADU guides →

Alhambra ADU FAQ

How many ADU builders serve Alhambra?

Our directory lists 49 ADU builders and contractors that appear for Alhambra on Google Maps, including companies based in nearby Los Angeles County communities.

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

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

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 Alhambra 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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