What insurance does a C-36 contractor need?

Workers' compensation is required by law once they have employees; the CSLB suspends a licence without it. Beyond that, producers usually place: Workers' comp; General liability with completed operations; Commercial auto (service fleets); Tools and equipment.

How many C-36 contractors are there in California?

17,330 active licences hold the C-36 classification as of 2026-09-06; 8,181 (47%) have workers' comp on file and 8,827 are exempt.

When do C-36 workers' comp policies renew?

1,882 renew within 90 days. January is the peak month.

Which WCIRB class codes apply to C-36 work?

Most often 5183 (Plumbing NOC), 5187 (Plumbing, residential service and repair). The WCIRB assigns the class from the actual operations and payroll, so verify per account in the WCIRB classification search.

CSLB classification · Plumbing

C-36 Plumbing Contractor

Name: C-36 Plumbing Contractor: California licence and insurance statistics
Creator: Birdray
License: https://creativecommons.org/licenses/by/4.0/

Installs and services plumbing systems. Third-largest class; service fleets, water damage completed-ops claims.

17,330

Active licences

8,181

With workers' comp

47%

1,882

Renewing in 90 days

284

Lapsed or suspended

8,827

Exempt

274

New in 90 days

Coverages a producer should expect

›Workers' comp
›General liability with completed operations
›Commercial auto (service fleets)
›Tools and equipment

Exposures underwriters ask about

· Water damage from completed work
· Service fleet auto
· Trench work

WCIRB classes usually assigned

5183 Plumbing NOC
5187 Plumbing, residential service and repair

Governing class depends on actual operations and payroll. Verify with the WCIRB classification search before quoting.

Carriers writing this class

Policies on file, statewide

C-36 workers' comp renewals by month, California

369

Sep

850

Oct

490

Nov

533

Dec

1,020

Jan

630

Feb

673

Mar

735

Apr

591

May

700

Jun

634

Jul

449

Aug

Sep

Counties with the most

Related classes in Plumbing

C-34 Pipeline Contractor C-42 Sanitation System Contractor C-55 Water Conditioning Contractor

Frequently asked

What does a C-36 licence allow a contractor to do?: Installs and services plumbing systems. Third-largest class; service fleets, water damage completed-ops claims.
What insurance does a C-36 contractor need?: Workers' compensation is required by law once they have employees; the CSLB suspends a licence without it. Beyond that, producers usually place: Workers' comp; General liability with completed operations; Commercial auto (service fleets); Tools and equipment.
How many C-36 contractors are there in California?: 17,330 active licences hold the C-36 classification as of 2026-09-06; 8,181 (47%) have workers' comp on file and 8,827 are exempt.
When do C-36 workers' comp policies renew?: 1,882 renew within 90 days. January is the peak month.
Which WCIRB class codes apply to C-36 work?: Most often 5183 (Plumbing NOC), 5187 (Plumbing, residential service and repair). The WCIRB assigns the class from the actual operations and payroll, so verify per account in the WCIRB classification search.

Selling to C-36 contractors in California?

Birdray runs signal-timed outbound for one agency per territory: the companies behind these numbers, the person to email, and the renewal date, sent from your inbox. The database is free to search.

How the outbound works Search free

Sources: CSLB licence and workers' compensation records, California Secretary of State, OSHA, FMCSA, county permits. Aggregates only; no individual contractor appears on this page. "Active" means a CLEAR licence status. Renewal counts include policies on file with the CSLB expiring in the window. Refreshed weekly; this page as of 2026-09-06. Every field and its source →