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ADU Builders in Glendora, CA

26 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 Glendora 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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Glendora is home to about 52,558 people (2020 Census) in Los Angeles County. We found 26 ADU builders and contractors that show up for Glendora homeowners on Google Maps, 5 of them based in the city itself. Their average Google rating is 4.7 stars. 10 market themselves specifically as ADU builders, and 1 mention garage conversions. 11 have a matched, active CSLB license shown with a verified badge. The top-rated by our review-weighted score are Prime Team Builders, Inc., Easy Builders Construction and Foothill Renovators.

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.

#7

The ADU Company

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

504 E Navilla Pl, Covina, CA 91723

Serves Glendora · based in Covina
ADU specialistRemodels & additionsHome builderGeneral contractor
CallWebsiteView profile
#11

DMAX Construction

5.0 (4 Google reviews)

621 N Monte Vista Ave, San Dimas, CA 91773

Serves Glendora · based in San Dimas
Remodels & additionsGeneral contractor
CallView profile
#13

ADU Experts

5.0 (3 Google reviews)

Service-area business · Azusa

Serves Glendora · based in Azusa
ADU specialistGeneral contractor
CallView profile
#14

B & D Construction

4.7 (13 Google reviews)
✔ CSLB License Verified #409057

1472 Avenida Loma Vista, San Dimas, CA 91773

Serves Glendora · based in San Dimas
Remodels & additionsHome builderGeneral contractor
CallWebsiteView profile
#24

CalHome ADU

1.0 (1 Google reviews)

2540 Fulton Rd, Pomona, CA 91767

Serves Glendora · based in Pomona
ADU specialistGeneral contractor
CallView profile
#25

JLF ADU

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

4716 N Fircroft Ave, Covina, CA 91722

Serves Glendora · based in Covina
ADU specialist
CallWebsiteView profile

Permits and pre-approved plans in Glendora

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

Planning an ADU in Glendora? Start here

The ADU Permit Process in California: Step by Step (2026)How to Legalize an Unpermitted ADU in California (AB 2533)AB 1033: Can You Sell an ADU Separately in California?How to Choose an ADU Builder in Southern California: 15-Point Checklist

All ADU guides →

Glendora ADU FAQ

How many ADU builders serve Glendora?

Our directory lists 26 ADU builders and contractors that appear for Glendora on Google Maps, including companies based in nearby Los Angeles County communities.

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

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

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 Glendora 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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