Most contractors know they must carry workers’ compensation. You’ve got a policy. You pay your premiums. You move on. But if you’re running a construction business — whether you’re a general contractor managing multiple trades or a specialty subcontractor on someone else’s project — there’s a good chance your workers’ comp situation is more complex than you think.
These aren’t issues you encounter in most non-construction industries. Classification codes, subcontractor relationships, payroll audits, and misclassification risk all create exposure points specific to how construction businesses are built and staffed. Getting it right requires more than just having a certificate on file.
This guide walks through the most common ways construction contractors run into trouble and what to look for to make sure you’re genuinely protected.
Why Workers’ Comp Insurance for Construction Is More Complex Than Other Industries
Workers’ comp premiums are calculated based on who your workers are, what they do, and how much you pay them. In most industries, that’s a relatively straightforward exercise. In construction, it isn’t.
California’s workers’ comp classification system — governed by the Workers’ Compensation Insurance Rating Bureau of California (WCIRB) — contains several hundred industry classifications, and construction accounts for a significant share of them. The WCIRB’s published list of Construction and Erection classifications alone runs dozens of codes deep, covering everything from masonry and roofing to sheet metal work, glazing, and structural steel erection. Most other states use the National Council on Compensation Insurance (NCCI) system, which operates similarly.
Each classification carries its own advisory pure premium rate — expressed as a dollar amount per $100 of payroll — based on the expected cost of injuries for that type of work. Roofing carries a higher rate than carpentry. Structural steel carries a higher rate than landscaping. Assigning the wrong code can create serious compliance exposure at audit time.
California adds another layer through its dual wage threshold system, which is unique to the WCIRB. Many construction classifications are divided into two tiers: a lower-wage classification and a higher-wage classification, each carrying a different rate. Workers earning above the published hourly threshold for their trade fall into the higher-wage class (and typically a lower insurance rate). Workers earning below it fall into the lower-wage class (and a higher rate). The state updates these thresholds regularly, which means your classification picture can shift from year to year.
The bottom line: construction is not a one-code industry. If you have workers doing different types of work, you may need to track and report them under separate classifications, and the difference in cost can be substantial.
The Subcontractor Coverage Question: Who Is Actually Covered?
One of the most common — and costly — misunderstandings in construction workers’ comp involves subcontractors.
Many general contractors assume that once they’ve hired a licensed sub, that sub’s workers are no longer their problem. In practice, it’s more complicated. In California and many other states, if a subcontractor fails to carry their own workers’ comp, the general contractor can be held responsible for any injuries to that subcontractor’s employees.
California law requires all employers to carry workers’ comp under Labor Code §3700. And under longstanding statutory employer principles enforced by California courts and the Department of Industrial Relations (DIR), liability for an uninsured subcontractor’s injured workers can extend to the hiring general contractor. The precise mechanics vary by state, as some apply this doctrine through statute, others through case law, but the practical risk is the same: an uninsured sub on your project can become your problem.
Ghost policies
There’s also the matter of ghost policies, which is a term worth understanding before you accept a certificate of insurance at face value. A ghost policy is a workers’ comp policy typically issued to a sole proprietor with no employees. It can satisfy a proof-of-insurance requirement on paper, but it does not provide coverage for employees. That means if that subcontractor brings workers onto your site, the certificate you accepted may not actually transfer the liability you thought it did.
The California Contractors State License Board (CSLB) requires licensed contractors to maintain active workers’ comp coverage or file a documented exemption. But a contractor who files an exemption today can hire workers tomorrow. Verifying coverage at the start of a project isn’t enough. It needs to be current and confirmed before work begins.
Your protection: Require a valid certificate of insurance from every subcontractor before they set foot on your site. Verify the policy is active, not just issued. Keep those certificates on file for the duration of the project and beyond.
How Workers’ Comp Audits Work
Here’s something many contractors don’t fully appreciate: the premium you pay at the start of your policy year is an estimate. It’s based on your projected payroll and the classifications assigned to your workers. At the end of the year, your insurer will conduct a premium audit to compare what actually happened. They will look at real payroll figures, actual job classifications, payments to subcontractors — against those original estimates. If the numbers don’t match, the insurance company adjusts your premium, sometimes significantly.
Construction businesses draw more scrutiny in this process than almost any other industry, for straightforward reasons. Payroll in construction fluctuates with the project calendar. You may carry a crew of 10 in January and 40 in August. Seasonal hiring, project-based labor, and using subcontractors all create variables that make your actual exposure different from what was projected.
During an audit, your insurer will typically review payroll records, tax filings, 1099s, certificates of insurance from subcontractors, and job cost records. If you can’t document that a subcontractor carried their own valid coverage, the payments you made to them may be reclassified as uninsured payroll and rated at your governing class code. To make that concrete: if you paid a subcontractor $80,000 and can’t produce a valid certificate at audit, that amount may be added to your payroll calculation, potentially adding thousands of dollars to your final premium.
What helps: Organized payroll records, current certificates of insurance for all subs, and consistent classification of your employees’ actual job duties throughout the year. Surprises at audit time are almost always the result of documentation gaps, not bad intentions.
Misclassification: The Mistake That Costs the Most
Classifying workers as independent contractors when they function as employees is a significant compliance risk in any industry. In construction, California has made it particularly consequential.
Under California’s ABC test framework — introduced by AB 5 and subsequently refined through AB 2257 and codified in the Labor Code — workers are presumed to be employees unless a hiring entity can demonstrate otherwise. The test requires showing that the worker is free from the hiring entity’s control, performs work outside the usual course of the business, and operates an independently established trade or business.
Construction subcontractors are subject to a somewhat different standard. Under California Labor Code §2750.5, which the DIR applies to construction work, there is a rebuttable presumption of employee status when a worker performs services that require a contractor’s license or are performed for a licensed contractor. Meeting the criteria to treat someone as a true independent subcontractor, including CSLB licensure, a separate business location, and an independent business operation, requires more than just issuing a 1099.
Getting it wrong has real consequences. If a worker is later reclassified as an employee, you may owe back premiums for the period they were uninsured, plus penalties. The risk compounds at audit time. If your carrier determines that someone you paid as a subcontractor was actually functioning as an employee — based on how the work was controlled, scheduled, and supervised — they can reclassify that person’s compensation and charge you accordingly.
What Happens If You’re Uninsured or Underinsured
California treats failure to carry workers’ comp as a serious legal matter. Under California Labor Code §3700.5, operating without required workers’ comp coverage is a criminal misdemeanor. Beyond the criminal exposure, the potential consequences can include:
- Fines that can reach up to $100,000, assessed by the state under Labor Code §3722, based on factors including the number of employees and whether injuries occurred
- A stop order from the Division of Labor Standards Enforcement (DLSE), which halts all work until coverage is secured — with further criminal exposure if the order is ignored
- Civil liability — if you’re uninsured and a worker is injured, workers’ comp is no longer the exclusive remedy: the injured worker can file a direct lawsuit against you
- Per-employee penalties of up to $10,000 for each employee on payroll at the time of a compensable injury, subject to the statutory cap
The severity of these outcomes depends on factors like willfulness and duration of noncompliance, but the exposure is real in every scenario — even when no injury has occurred. The Division of Labor Standards Enforcement can issue a stop order and initiate penalties based on a compliance audit alone.
Beyond legal consequences, being uninsured or underinsured has practical project-level effects. Most general contractors and project owners require a current certificate of insurance before any subcontractor can begin work on site. A lapsed or insufficient policy can pull you off a project — or disqualify you from bidding on the next one.
What to Look for in a Construction Workers’ Comp Policy
Not all workers’ comp policies are built for construction, and the difference matters. When evaluating your coverage, here are the key elements to verify:
Accurate payroll estimates. Starting with realistic projections reduces the chance of a large audit adjustment at year end. Work with your broker to establish payroll estimates based on actual hiring plans, not round numbers.
Correct classification of all workers. Each employee and job type should be assigned to the classification code that accurately reflects the work they perform. In California, this includes verifying dual wage thresholds for applicable construction codes.
Subcontractor verification. Your policy should support a process for collecting and tracking certificates of insurance from every sub you engage. Gaps in this process can become your liability at audit time.
Your Experience Modification Rate (EMR). The EMR — sometimes called the X-Mod or experience mod — is a numerical factor that adjusts your workers’ comp premium based on your actual claims history compared to other businesses of similar size and trade. An EMR of 1.0 represents the industry average. A rate below 1.0 reflects a better-than-average safety record and translates to a premium credit. A rate above 1.0 results in a surcharge. For construction contractors, the EMR carries additional weight. Many general contractors and project owners use it as a prequalification threshold. Some won’t allow subcontractors with an EMR above 1.0 — or in some cases 0.85 — to bid on their projects at all. Managing your EMR over time is one of the most direct ways to control your cost of coverage.
A knowledgeable broker can help you review all of the above before your policy renews — not after the audit lands on your desk.
Your Coverage Deserves the Same Attention You Give Your Projects
Workers’ comp in construction isn’t a set-it-and-forget-it policy. It’s a living document that you should review, maintain, and manage alongside your business. Classification codes change. Crews change. Subcontractor relationships change. And the rules — especially in California — continue to evolve.
Meslee takes the time to understand your business before we recommend coverage. We review your classifications, walk through your subcontractor process, and make sure your payroll estimates actually reflect how you work. If something doesn’t fit, we find coverage that does.
If you’d like a second set of eyes on your current workers’ comp policy, we’re here to help.
