If you employ even one person in California — full-time, part-time, or even a temporary helper — you are required to carry workers' compensation insurance. There are no exceptions for small contractors, and the penalties for going without it are steep: stop-work orders, fines starting at $10,000, and potential criminal charges for repeat offenders.
We get questions about this every week from contractors who are new to running a crew, or veterans whose costs have crept up over the years. Here's what actually matters in 2026.
Why classification codes drive your premium
Every employee gets assigned a classification code that reflects the risk of their work. Roofers (5552) carry one of the highest rates in the state. Carpenters (5403), electricians (5190), and plumbers (5183) sit in the middle. Office staff (8810) sit at the bottom.
Your premium is calculated by multiplying your annual payroll for each classification by that code's rate per $100 of payroll, then adjusting for your experience modification (X-Mod). A roofer making $60,000 a year can cost an employer $9,000+ in workers' comp alone. A clerk at the same wage might cost $200.
Two things follow from this:
- Misclassification is the most common premium mistake we see. Putting a project manager in the carpenter code, or vice versa, can cost (or save) thousands of dollars per year. If a worker spends most of their time in the office and only occasionally visits job sites, they may qualify for the lower clerical rate.
- Splitting payroll correctly matters. California allows you to split an employee's payroll across classifications when they genuinely perform multiple roles, but the rules are strict and you need to keep contemporaneous records.
Your X-Mod is the lever you control
Your experience modification factor compares your claims history to the average employer in your industry. A neutral X-Mod is 1.00. If yours is 0.85, you pay 15% less than the average. If it's 1.20, you pay 20% more.
Three or more claims in a three-year window will almost certainly push your X-Mod above 1.00, and once it's there, it can take years to bring back down. The most effective ways to control it:
- Report every injury immediately, even small ones. Hidden injuries become big claims.
- Get injured workers back on modified duty fast. Light-duty work counts as a return to work and limits indemnity costs.
- Run a documented safety program. Carriers often offer 5-10% discounts for documented OSHA-compliant programs.
What we see contractors get wrong
The single biggest mistake: assuming subcontractors don't need their own coverage. If your sub doesn't have a valid workers' comp policy, California will treat their workers as YOUR employees for premium audit purposes. You'll get charged for their payroll on your policy.
Always collect a current Certificate of Insurance from every sub before they start work. We help our clients set up automated COI tracking so this doesn't slip through the cracks.
When to shop your policy
Most contractors should compare workers' comp rates every 1-2 years. Rates vary significantly between carriers — sometimes 30% or more for the same risk profile. The carriers that are competitive for one trade may be expensive for another, and the market shifts year to year.
If you've had your policy for more than two years without a comparison, you're probably overpaying.
We work with 20+ carriers and shop the market for our contractor clients every renewal. If you'd like a no-obligation comparison of what your current premium looks like across the market, give us a call or request a quote — we can usually have numbers back to you within a few business days.
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Our team has been answering insurance questions for Orange County since 1980. Give us a call or request a free, no-obligation quote — we'll get you answers tailored to your situation.