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

ADU Builders in San Diego County

332 builders across 16 cities · 175 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 San Diego County 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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San Diego was an early ADU adopter. Coastal-zone lots may need a coastal development permit, which state law now requires within 60 days, and transit-area lots often qualify for the 18-foot detached height allowance.

Cities in San Diego County

Carlsbad 67Chula Vista 86Coronado 99El Cajon 22Encinitas 64Escondido 110Imperial Beach 13La Mesa 41Lemon Grove 20National City 99Oceanside 56Poway 49San Diego 120San Marcos 66Santee 67Vista 60

Pre-approved plans and ADU programs in San Diego County

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

Top-rated ADU builders in San Diego County

#29

TNT Design & Build

4.9 (175 Google reviews)
✔ CSLB License Verified #1012379

3142 Tiger Run Ct #108, Carlsbad, CA 92010

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