ADU CITIES Contractor Directory

Tsai Masterbuilders

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

☎ Call (909) 319-9383Verify this license at CSLB
CSLB license#457096
ClassificationsB — General Building
Office of record819 N Streamview Street
Walnut, CA 91789
Address as listed in the CSLB record — the office of record, not a service-area claim.
Phone (CSLB record)(909) 319-9383
Contractor bond$25,000 — Jet Insurance Company
Workers' comp (CSLB record)Exempt
Business typeSole Owner
License issuedMay 18, 1984
License expiresFebruary 29, 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.