ADU builder? The featured spot in your city is open. Call or text 424-298-3600

ADU Builders in South Pasadena, CA

24 builders · ranked by Google rating and review volume · 10 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 South Pasadena homeowners who are comparing builders right now. Includes your logo, project photos, a direct call button and a link to your website.

📞 Call 424-298-3600💬 Text 424-298-3600

Located in Los Angeles County, South Pasadena had a 2020 Census population of about 26,943. We found 24 ADU builders and contractors that show up for South Pasadena homeowners on Google Maps, 5 of them based in the city itself. Their average Google rating is 4.8 stars. 3 market themselves specifically as ADU builders, and 1 mention garage conversions. 10 have a matched, active CSLB license shown with a verified badge. The top-rated by our review-weighted score are Coronado Construction Company Inc, CAP Angeles Construction Inc and Willbii 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.

#3

Willbii Inc.

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

2158 Huntington Dr, San Marino, CA 91108

Serves South Pasadena · based in San Marino
Remodels & additionsHome builderGeneral contractor
CallWebsiteView profile
#4

Teamup Construction

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

35 N Lake Ave #710, Pasadena, CA 91101

Serves South Pasadena · based in Pasadena
Remodels & additionsHome builderGeneral contractor
CallWebsiteView profile
#6

Pasadena Repair Pro

4.9 (25 Google reviews)

35 N Lake Ave #710, Pasadena, CA 91101

Serves South Pasadena · based in Pasadena
Garage conversionsRemodels & additions
CallView profile
#10

Nott & Associates

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

1508 Mission St, South Pasadena, CA 91030

Based in South Pasadena
Remodels & additionsHome builderGeneral contractor
CallWebsiteView profile
#12

LUDIS INC

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

15 E McLean St, Alhambra, CA 91801

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

Permits and pre-approved plans in South Pasadena

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

Planning an ADU in South Pasadena? Start here

SB 9 vs ADU: Lot Splits, Duplexes and Backyard Units in CaliforniaJADU vs ADU in California: Size, Rules, Cost and Which to BuildADU Rental Income and Property Taxes in California: What to ExpectThe ADU Permit Process in California: Step by Step (2026)

All ADU guides →

South Pasadena ADU FAQ

How many ADU builders serve South Pasadena?

Our directory lists 24 ADU builders and contractors that appear for South Pasadena on Google Maps, including companies based in nearby Los Angeles County communities.

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

Yes. ADUs need a building permit from the City of South 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 South 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 South 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 98Pasadena 100Downey 28West Covina 68El Monte 24
📞 Call 424-298-3600💬 Text us