ADU CITIES Contractor Directory

Irwin Building Co

Also listed as: Callidoscope LLC

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

☎ Call (858) 382-2499Verify this license at CSLB
CSLB license#1158549
ClassificationsB — General Building
Office of record5580 La Jolla Blvd #188
La Jolla, CA 92037
Address as listed in the CSLB record — the office of record, not a service-area claim.
Phone (CSLB record)(858) 382-2499
Contractor bond$25,000 — American Contractors Indemnity Company
Workers' comp (CSLB record)Workers' Compensation Insurance — State Compensation Insurance Fund
Business typeLimited Liability
License issuedJuly 24, 2026
License expiresJuly 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.