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ADU Builders in Pasadena, CA

100 builders · ranked by Google rating and review volume · 36 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 Pasadena 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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Pasadena is home to about 138,699 people (2020 Census) in Los Angeles County. We found 100 ADU builders and contractors that show up for Pasadena homeowners on Google Maps, 17 of them based in the city itself. Their average Google rating is 4.9 stars. 35 market themselves specifically as ADU builders, and 3 mention garage conversions. 36 have a matched, active CSLB license shown with a verified badge. The top-rated by our review-weighted score are Hollywood Contractor Corp, Coronado Construction Company Inc and Western Building Solutions.

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.

#3

Western Building Solutions

5.0 (52 Google reviews)
✔ CSLB License Verified #1139272

430 Foothill Blvd Ste D, La Cañada Flintridge, CA 91011

Serves Pasadena · based in La Cañada Flintridge
Remodels & additionsGeneral contractor
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#4

Zenith Builder

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

Service-area business · Temple City

Serves Pasadena · based in Temple City
Remodels & additions
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#5

Ace Design & Build

5.0 (29 Google reviews)
✔ CSLB License Verified #1132942

205 S Broadway 7 #7, Los Angeles, CA 90012

Serves Pasadena · based in Los Angeles
Design-buildGeneral contractor
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#7

ADU Builders Today

4.9 (61 Google reviews)

1346 Foothill Blvd #407, La Cañada Flintridge, CA 91011

Serves Pasadena · based in La Cañada Flintridge
ADU specialistGeneral contractor
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#12

Hillside General

5.0 (16 Google reviews)
✔ CSLB License Verified #1052290

Service-area business · La Cañada Flintridge

Serves Pasadena · based in La Cañada Flintridge
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#23

Enhaus Design Build

5.0 (11 Google reviews)
✔ CSLB License Verified #1104705

778 Alameda St, Altadena, CA 91001

Serves Pasadena · based in Altadena
Design-buildHome builderGeneral contractor
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#28

Infinite Development Group

5.0 (10 Google reviews)
✔ CSLB License Verified #1120847

2505 Foothill Blvd Unit E, La Crescenta-Montrose, CA 91214

Serves Pasadena · based in La Crescenta-Montrose
Remodels & additionsHome builderGeneral contractor
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#31

Opus Builders

5.0 (9 Google reviews)
✔ CSLB License Verified #1059646

1412 Colorado Blvd, Los Angeles, CA 90041

Serves Pasadena · based in Los Angeles
General contractor
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#33

Nott & Associates

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

1508 Mission St, South Pasadena, CA 91030

Serves Pasadena · based in South Pasadena
Remodels & additionsHome builderGeneral contractor
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#34

MKW Homes Inc

5.0 (8 Google reviews)
✔ CSLB License Verified #1074934

Service-area business · Pasadena

Serves Pasadena · based in Pasadena
Remodels & additionsHome builderGeneral contractor
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#38

LUDIS INC

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

15 E McLean St, Alhambra, CA 91801

Serves Pasadena · based in Alhambra
Remodels & additionsHome builderGeneral contractor
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#42

The ADU Company

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

504 E Navilla Pl, Covina, CA 91723

Serves Pasadena · based in Covina
ADU specialistRemodels & additionsHome builderGeneral contractor
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#48

Major Construction

5.0 (5 Google reviews)
✔ CSLB License Verified #1092223

121 W Lexington Dr #521A, Glendale, CA 91203

Serves Pasadena · based in Glendale
Remodels & additionsGeneral contractor
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#52

Home Front Build

4.8 (9 Google reviews)
✔ CSLB License Verified #962293

715 Cypress Ave, Los Angeles, CA 90065

Serves Pasadena · based in Los Angeles
Remodels & additionsHome builderGeneral contractor
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#55

BUILDER 20 INC

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

1817 N Ave 56, Los Angeles, CA 90042

Serves Pasadena · based in Los Angeles
General contractor
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#59

Adu design

5.0 (3 Google reviews)

Service-area business · Pico Rivera

Serves Pasadena · based in Pico Rivera
ADU specialistGeneral contractor
CallView profile
#65

D-Best ADU Company

5.0 (2 Google reviews)

2626 Foothill Blvd, La Crescenta-Montrose, CA 91214

Serves Pasadena · based in La Crescenta-Montrose
ADU specialist
CallView profile
#71

Otto ADU

4.6 (13 Google reviews)
✔ CSLB License Verified #1081287

2926 Denby Ave Unit B, Los Angeles, CA 90039

Serves Pasadena · based in Los Angeles
ADU specialist
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#86

MF ADU

3.0 (2 Google reviews)

1979 Lake Ave, Altadena, CA 91001

Serves Pasadena · based in Altadena
ADU specialistHome builder
CallWebsiteView profile
#89

JLF ADU

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

4716 N Fircroft Ave, Covina, CA 91722

Serves Pasadena · based in Covina
ADU specialist
CallWebsiteView profile

Pasadena ADU programs and pre-approved plans

Links verified November 2026. Program details change, so confirm current status with the city. See all SoCal pre-approved ADU plan programs.

Planning an ADU in Pasadena? Start here

How Long Does It Take to Build an ADU in Southern California?How to Legalize an Unpermitted ADU in California (AB 2533)Prefab and Modular ADUs in California: Real Costs, Permits and PitfallsSB 9 vs ADU: Lot Splits, Duplexes and Backyard Units in California

All ADU guides →

Pasadena ADU FAQ

How many ADU builders serve Pasadena?

Our directory lists 100 ADU builders and contractors that appear for Pasadena on Google Maps, including companies based in nearby Los Angeles County communities.

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

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

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 Pasadena 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 98Downey 28West Covina 68El Monte 24Inglewood 46
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