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ADU Builders in Seal Beach, CA

28 builders · ranked by Google rating and review volume · 18 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 Seal Beach 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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Seal Beach is home to about 25,242 people (2020 Census) in Orange County. We found 28 ADU builders and contractors that show up for Seal Beach homeowners on Google Maps, 2 of them based in the city itself. Their average Google rating is 4.9 stars. 6 market themselves specifically as ADU builders. 18 have a matched, active CSLB license shown with a verified badge. The top-rated by our review-weighted score are ADU West Coast, C&M Home Revival and RSF Construction Inc.

In Orange County, HOA and design-standard questions come up often. State law voids CC&Rs that ban ADUs, but HOAs can still apply reasonable objective standards. Compact lots make attached units and garage conversions popular.

#1

ADU West Coast

5.0 (37 Google reviews)
✔ CSLB License Verified #1064076

13001 Seal Beach Blvd #210, Seal Beach, CA 90740

Based in Seal Beach
ADU specialistHome builderGeneral contractor
CallWebsiteView profile
#2

C&M Home Revival

4.9 (205 Google reviews)
✔ CSLB License Verified #1129475

4510 E Pacific Coast Hwy #120, Long Beach, CA 90804

Serves Seal Beach · based in Long Beach
Remodels & additionsHome builder
CallWebsiteView profile
#4

Avalon Studio Design Build Corp

5.0 (26 Google reviews)
✔ CSLB License Verified #1101572

17081 Sims Lane Unit A, Huntington Beach, CA 92649

Serves Seal Beach · based in Huntington Beach
Design-buildRemodels & additionsHome builderGeneral contractor
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#5

HQ Remodeling & Design Inc

4.9 (70 Google reviews)
✔ CSLB License Verified #1041842

17011 Beach Blvd suite 900, Huntington Beach, CA 92647

Serves Seal Beach · based in Huntington Beach
Remodels & additionsGeneral contractor
CallWebsiteView profile
#8

Zieba Builders, Inc.

5.0 (14 Google reviews)
✔ CSLB License Verified #558572

1390 E Burnett St A, Signal Hill, CA 90755

Serves Seal Beach · based in Signal Hill
Remodels & additionsGeneral contractor
CallWebsiteView profile
#9

Orr Construction Company

5.0 (13 Google reviews)
✔ CSLB License Verified #1028720

1977 Obispo Ave, Signal Hill, CA 90755

Serves Seal Beach · based in Signal Hill
Remodels & additionsHome builderGeneral contractor
CallWebsiteView profile
#12

A&A Builder

4.9 (16 Google reviews)

Service-area business · Seal Beach

Serves Seal Beach · based in Seal Beach
Remodels & additionsHome builder
CallWebsiteView profile
#17

Dv construction

5.0 (4 Google reviews)
✔ CSLB License Verified #1116638

10055 Lampson Ave, Garden Grove, CA 92840

Serves Seal Beach · based in Garden Grove
CallView profile
#18

MTR Construction, Inc.

4.7 (15 Google reviews)
✔ CSLB License Verified #929602

1711 E 20th St, Signal Hill, CA 90755

Serves Seal Beach · based in Signal Hill
Remodels & additionsHome builderGeneral contractor
CallWebsiteView profile
#22

7 Point Construction

4.3 (6 Google reviews)
✔ CSLB License Verified #896345

201 Covina Ave #4, Long Beach, CA 90803

Serves Seal Beach · based in Long Beach
Remodels & additionsHome builderGeneral contractor
CallWebsiteView profile
#24

aducustomhomes

No rating yet (0 Google reviews)
✔ CSLB License Verified #530033

5199 CA-1, Long Beach, CA 90804

Serves Seal Beach · based in Long Beach
ADU specialistHome builder
CallWebsiteView profile
#25

J&R ADU

No rating yet (0 Google reviews)

Service-area business · Fountain Valley

Serves Seal Beach · based in Fountain Valley
ADU specialistPrefab / modularHome builder
CallWebsiteView profile
#27

KLEAN Construction

No rating yet (0 Google reviews)
✔ CSLB License Verified #1152752

700 Santiago Ave, Long Beach, CA 90804

Serves Seal Beach · based in Long Beach
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Permits and pre-approved plans in Seal Beach

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

Planning an ADU in Seal Beach? Start here

The ADU Permit Process in California: Step by Step (2026)ADU Rental Income and Property Taxes in California: What to ExpectHow to Legalize an Unpermitted ADU in California (AB 2533)SB 9 vs ADU: Lot Splits, Duplexes and Backyard Units in California

All ADU guides →

Seal Beach ADU FAQ

How many ADU builders serve Seal Beach?

Our directory lists 28 ADU builders and contractors that appear for Seal Beach on Google Maps, including companies based in nearby Orange County communities.

Do I need a permit to build an ADU in Seal Beach?

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

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 Seal Beach 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 Orange County

Anaheim 114Santa Ana 97Irvine 107Huntington Beach 88Garden Grove 97Fullerton 23Orange 95Costa Mesa 103Mission Viejo 59Westminster 53Lake Forest 60Newport Beach 96
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