ADU Contractors in San Bernardino County, CA
6,185 active, license-verified contractors with an office of record in San Bernardino County — general builders (A & B) and the licensed trades that build ADUs (C-10 electrical, C-36 plumbing, C-5 framing). Pick your city, or search directly.
Mars Construction Industries Corp
ADU Cities' own design-build team
CSLB #1138550 · A · B · C-36 · C-20
Building ADUs across Los Angeles, Orange, Riverside, San Bernardino, San Diego & Ventura counties
San Bernardino is the largest county by land area in the continental United States, and this directory's 6,185 active, license-verified contractors — general builders (A and B) plus the licensed trades ADU projects use (C-10 electrical, C-36 plumbing, C-5 framing) — spread from Chino Hills and Rancho Cucamonga through the valley cities to the high desert, Big Bear, and Twentynine Palms.
Distance matters here: a contractor's office of record can be an hour from your lot, and mountain and desert communities add snow-load, fire-zone, and septic questions that valley cities never see. Verify the license, then ask any builder how they handle permits in your specific community.