ADU CITIES Contractor Directory

Langwasser John Construction

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

☎ Call (909) 982-1501Verify this license at CSLB
CSLB license#778396
ClassificationsB — General Building
Office of record204 Sultana Avenue
Upland, CA 91786
Address as listed in the CSLB record — the office of record, not a service-area claim.
Phone (CSLB record)(909) 982-1501
Contractor bond$25,000 — Atlantic Specialty Insurance Company
Workers' comp (CSLB record)Exempt
Business typeSole Owner
License issuedMay 8, 2000
License expiresMay 31, 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.