ADU CITIES Contractor Directory

Duncan Warren Contracting

● Active — license status verified against CSLB public data as of November 6, 2026

☎ Call (909) 880-8501Verify this license at CSLB
CSLB license#553327
ClassificationsA — General Engineering · C-21 — Building Moving and Demolition · D-40 · HAZ — Hazardous Substance Removal
Office of record19867 Cajon Blvd
San Bernardino, CA 92407
Address as listed in the CSLB record — the office of record, not a service-area claim.
Phone (CSLB record)(909) 880-8501
Contractor bond$25,000 — American Contractors Indemnity Company
Workers' comp (CSLB record)Workers' Compensation Insurance — State Compensation Insurance Fund
Business typeSole Owner
License issuedJanuary 10, 1989
License expiresJanuary 31, 2027

Is this your business? Claim this listing to enhance it with your website, photos, and project details.

Data source: CSLB public records as of November 6, 2026. License status can change at any time — verify live at CSLB before signing a contract.