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

ADU Builders in Orange County

359 builders across 30 cities · 188 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 Orange County 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

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.

Cities in Orange County

Aliso Viejo 22Anaheim 114Brea 74Buena Park 52Costa Mesa 103Cypress 61Dana Point 10Fountain Valley 65Fullerton 23Garden Grove 97Huntington Beach 88Irvine 107La Habra 6Laguna Beach 56Laguna Hills 48Laguna Niguel 44Lake Forest 60Mission Viejo 59Newport Beach 96Orange 95Placentia 18Rancho Santa Margarita 41San Clemente 12San Juan Capistrano 30Santa Ana 97Seal Beach 28Stanton 61Tustin 98Westminster 53Yorba Linda 63

Pre-approved plans and ADU programs in Orange County

County programs apply to unincorporated areas. City programs apply within that city. Links verified November 2026.

Top-rated ADU builders in Orange County

#15

ADU West Coast

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

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

ADU specialistHome builderGeneral contractor
CallWebsiteView profile
#28

Modernyze

5.0 (26 Google reviews)
✔ CSLB License Verified #1019812

2323 Main St, Irvine, CA 92614

Remodels & additionsHome builderGeneral contractor
CallWebsiteView profile
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