Birdray

CSLB classification · Earthwork/Paving

D-56 Trenching Only

Trenching for utilities.

162
Active licences
84
With workers' comp
52%
22
Renewing in 90 days
5
Lapsed or suspended
73
Exempt
2
New in 90 days

Coverages a producer should expect

  • ›Workers' comp
  • ›General liability
  • ›Equipment

WCIRB classes usually assigned

  • 6217 Excavation NOC

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

Carriers writing this class

Policies on file, statewide

  1. State Compensation Insurance Fund21
  2. Insurance Co. Of The West11
  3. Hartford Casualty Insurance Co.5
  4. Everest Premier Insurance Co.3
  5. Starstone National Insurance Co.2
  6. Old Republic Insurance Co.2
  7. Pacific Compensation Insurance Co.2
  8. Pie Insurance Co.2
  9. Continental Casualty Co.2
  10. National Liability And Fire Insurance Co.2

D-56 workers' comp renewals by month, California

4
Sep
11
Oct
7
Nov
2
Dec
15
Jan
3
Feb
6
Mar
7
Apr
4
May
10
Jun
5
Jul
6
Aug
2
Sep

Counties with the most

  1. Riverside County24
  2. Los Angeles County14
  3. San Bernardino County13
  4. Kern County13
  5. Orange County12
  6. San Diego County10
  7. Fresno County9
  8. Placer County6
  9. Alameda County6
  10. Sacramento County6
  11. County5
  12. Santa Barbara County4

Related classes in Earthwork/Paving

C-12 Earthwork and Paving ContractorC-31 Construction Zone Traffic Control ContractorC-32 Parking and Highway Improvement Contractor

Frequently asked

What does a D-56 licence allow a contractor to do?
Trenching for utilities.
What insurance does a D-56 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; Equipment.
How many D-56 contractors are there in California?
162 active licences hold the D-56 classification as of 2026-09-06; 84 (52%) have workers' comp on file and 73 are exempt.
When do D-56 workers' comp policies renew?
22 renew within 90 days. January is the peak month.
Which WCIRB class codes apply to D-56 work?
Most often 6217 (Excavation NOC). The WCIRB assigns the class from the actual operations and payroll, so verify per account in the WCIRB classification search.
Selling to D-56 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 worksSearch 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 →

D-56 Trenching Only: Insurance and WCIRB Classes | Birdray