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C45 Sign License (California)

California has 856 active C45 Sign holders in the state file as of 2026-10-29¹, the 42nd-largest of 64 classes with at least 200 holders. 23 of them expire by 2026-12-28.

Active holders: 856; 0.4% of active California licenses
Expiring by 2026-12-28: 23; 2.7% of holders
Median bond on file: $25,000; 856 bonds
Workers' comp exempt: 39.7%; of 856 with WC status

How many C45 contractors are exempt from workers' comp?

340 of 856 active C45 holders with a recorded status (39.7%) filed an exemption¹, against 48.7% across all California classes.

How do you check a C45 license?

Search by license number or business name on the California license lookup, which reads the same state file.

Other California license classes

C42 Sanitation System962
D63 Construction Clean-up849
C5 Framing and Rough Carpentry1,036
D24 Metal Products809
D21 Machinery and Pumps1,042
ASB Asbestos Certification773
C23 Ornamental Metal1,067
C57 Well Drilling712

All 64 classes

Sources

CA CSLB License Master (cslb.ca.gov data portal) (cslb.ca.gov, 2026-10-29)