ADU Contractors in San Bernardino, CA — License-Verified Contractors
Every contractor below holds an active California license with an office of record in San Bernardino, verified against CSLB public data as of November 6, 2026: general builders — A (General Engineering) and B (General Building), the classifications that can build an ADU — and the licensed trades ADU construction uses, C-10 Electrical, C-36 Plumbing and C-5 Framing & Rough Carpentry. Listings are alphabetical; the featured builder is labeled, never ranked.
ADU rules — setbacks, size limits, parking, and fees — are set by the local jurisdiction and change often. Before you hire, read the ADU permit process guide and the Southern California ADU cost guide, and verify any license free at CSLB.
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
426 license-verified contractors based in San Bernardino — page 9 of 9
True Power Electric Co
C-10Trujillo's General Builds
BTubul Danielle Mazal
BUnderground Manholes
Underground Builders Inc
AC-42United Security Applications & Service
C-10Upgrade California Construction
Upgrade California LLC
BValdivia Pro Plumbing LLC
C-36Var Construction
BVega General Building Contractors
Vega General Contractors
BC-20Velazquez Investment & General Contracting
BVerdant Landscape Services Inc
BC-27Villanueva Alfredo Electrical Services
C-10W Wood & Associates Development Inc
ABC-27Warren Kevin General Contractor
BWatermarke Homes L L C
BWeka Inc
AWest Coast General Services Inc
BWest Coast Repipe Inc
C-10C-36Westec Builder
BWestpoint Construction Inc
BWhelan Electric Inc
C-10Wyatt Construction
ASBBC-21Yanny's Construction
BZarate Juan
BZuniga Construction
BData source: CSLB public records as of November 6, 2026 · Verify any license at CSLB