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C31 Construction Zone Traffic Control License (California)

California has 472 active C31 Construction Zone Traffic Control holders in the state file as of 2026-10-29¹, the 53rd-largest of 64 classes with at least 200 holders. 11 of them expire by 2026-12-28.

Active holders: 472; 0.2% of active California licenses
Expiring by 2026-12-28: 11; 2.3% of holders
Median bond on file: $25,000; 472 bonds
Workers' comp exempt: 16.7%; of 472 with WC status

How many C31 contractors are exempt from workers' comp?

79 of 472 active C31 holders with a recorded status (16.7%) filed an exemption¹, against 48.7% across all California classes.

How do you check a C31 license?

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

Other California license classes

C32 Parking and Highway Improvement500
C47 General Manufactured Housing451
D03 Awnings525
D38 Sand and Water Blasting424
C34 Pipeline545
D42 Non-Electrical Sign Installation422
C49 Tree and Palm631
D41 Siding and Decking414

All 64 classes

Sources

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