ADU Contractors in Rancho Cucamonga, CA — License-Verified Contractors
Every contractor below holds an active California license with an office of record in Rancho Cucamonga, 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
582 license-verified contractors based in Rancho Cucamonga — page 12 of 12
Villegas Group General Contracting & Project Management The
BW C C G Inc
BC-10C-20C-36W C C S Inc
BC-10C-20C-36W G C
BW.c. Walker Electric
C-10W.l Construction
BC-8Warrior Electric
Warrior Inc
C-10Weatherguard Company Inc
BC-39Wen Chih Shen
BWest Coast Fire Inc
BC-16West Coast General Engineering & Demo Inc
AC-21West Coast Platinum Builders Inc
BWestland Group Inc
AWestland Mechanical LLC
BC-20Westwood Garry
BWilliams Rick
C-36Wing Fung Construction Inc
BWizard Restorations Inc
BD-63Wolf Homes Construction
BWoodworth J Construction
BWorld Famous Plumbing
C-36Xiangyu Liu
BY C D Inc
ABYangze Fusen
BC-27Yassin Baraa Thamir
BYellow Electric
C-10Yicraft Construction
BYoung's Plumbing And Rooter
C-36Yuma Construction Inc
BZ W Construction
BZhu Zhu Construction
BData source: CSLB public records as of November 6, 2026 · Verify any license at CSLB