ADU CITIES Contractor Directory

Cal Building Systems Inc

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

☎ Call (714) 993-9650Verify this license at CSLB
CSLB license#521087
ClassificationsC-10 — Electrical · C-16 — Fire Protection · C-7 — Low Voltage Systems
Office of record3900 Prospect Ave Unit B
Yorba Linda, CA 92886
Address as listed in the CSLB record — the office of record, not a service-area claim.
Phone (CSLB record)(714) 993-9650
Contractor bond$25,000 — American Contractors Indemnity Company
Workers' comp (CSLB record)Workers' Compensation Insurance — National Casualty Company
Business typeCorporation
License issuedNovember 19, 1987
License expiresNovember 30, 2027

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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.