ADU Contractors in Pinon Hills, CA — License-Verified Contractors
Every contractor below holds an active California license with an office of record in Pinon Hills, 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
26 license-verified contractors based in Pinon Hills
A New Dawn Construction Inc
BA-quality Construction Company
BAdvanced Vacuum Plumbing Systems
C-36Aguirre's General Construction
BAlyea M C Construction
BC-5American Contracting Inc
BClean Star Electric
C-10D-63D Q E Electric Inc
C-10Davison Electric
William Davison
C-10Earthright Building And Development Inc
BFar West Electric
C-10Gamble Construction Company
Gamble Harvey JR
BGmpi LLC
C-36Hazard Robert Kenneth
BHoward Bruce Alan
BJuliot Construction
BKalmutzki Construction
BKoontz Konstruction Services
BC-54Montgomery B W Underground Inc
ANan-c Construction
BNichols Construction
BO C Electric
BC-10Patterson Ronald Lee
C-36C-42Simons Construction
BViking Plumbing
C-36Data source: CSLB public records as of November 6, 2026 · Verify any license at CSLB