ADU CITIES Contractor Directory

Cornerstone Design Build

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

☎ Call (310) 818-9512Verify this license at CSLB
CSLB license#1097027
ClassificationsB — General Building
Office of record440 N Barranca Ave Suite 3752
Covina, CA 91723
Address as listed in the CSLB record — the office of record, not a service-area claim.
Phone (CSLB record)(310) 818-9512
Contractor bond$25,000 — American Contractors Indemnity Company
Workers' comp (CSLB record)Workers' Compensation Insurance — State Compensation Insurance Fund
Business typeCorporation
License issuedSeptember 26, 2022
License expiresSeptember 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.