ADU CITIES Contractor Directory

Cornerstone Engineering Contractors

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

☎ Call (909) 725-3500Verify this license at CSLB
CSLB license#1153466
ClassificationsA — General Engineering
Office of record7461 Windrose Dr
Highland, CA 92346
Address as listed in the CSLB record — the office of record, not a service-area claim.
Phone (CSLB record)(909) 725-3500
Contractor bond$25,000 — American Contractors Indemnity Company
Workers' comp (CSLB record)Exempt
Business typeCorporation
License issuedApril 14, 2026
License expiresApril 30, 2028

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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.