ADU CITIES Contractor Directory

Cornerstone Design & Build

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

CSLB license#1106091
ClassificationsA — General Engineering · B — General Building · C-10 — Electrical
Office of record124 E 30TH St Ste D
National City, CA 91950
Address as listed in the CSLB record — the office of record, not a service-area claim.
Phone (CSLB record)(619) 851-7478
Contractor bond$25,000 — American Contractors Indemnity Company
Workers' comp (CSLB record)Exempt
Business typeCorporation
License issuedJune 16, 2023
License expiresJune 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.