Insurance and bonds

What is workers compensation in construction?

Workers compensation is insurance, required under state law in most cases, that pays medical bills and part of lost wages for employees injured or made ill by their work, generally regardless of who was at fault.

Two construction professionals review paper plans beside a tablet at a jobsite workbench.
Plan reviews connect field conditions, drawings, and the next decisions on a job. AI-generated illustration.

Workers compensation (workers comp) is a no-fault system. If a carpenter falls from a ladder, the employer's workers comp policy pays for treatment and replaces part of the carpenter's wages while they recover, without anyone needing to prove negligence. In exchange, the injured employee generally cannot sue the employer in court for that injury. For construction companies, it is one of the largest costs on every hour of labor.

Workers comp is run mostly by the states. The U.S. Department of Labor notes that it does not administer workers compensation for private-sector employees; those workers deal with their state workers compensation board. DOL's Office of Workers' Compensation Programs runs four federal programs instead, covering federal employees, longshore and harbor workers, coal miners with black lung, and certain energy employees. Coverage rules, who must carry it, and benefit levels all differ by state.

How premiums work for contractors

  • Classification codes: each type of work (carpentry, roofing, clerical) has its own rate applied to payroll. Higher-risk field trades generally carry much higher rates than office work.
  • Payroll: premium is estimated at the start of the policy from projected payroll by class.
  • Experience modification: a company's own claims history adjusts the rate up or down. See how to calculate a construction company EMR.
  • Year-end audit: the insurer checks actual payroll and any uninsured subcontractors, then bills or refunds the difference.

The subcontractor audit trap

Say a framing GC pays $180,000 to a crew of three "subs" during the year. At audit, the insurer asks for each sub's certificate of insurance showing workers comp. Two have none. In many states, the GC's insurer can then treat the payments to those uninsured subs as the GC's own payroll and charge premium on it at the framing rate. A bill like that, months after the work is done, can wipe out the profit on several jobs.

The fix is simple and boring: collect a current certificate of insurance from every sub before they start, track expiration dates, and do not pay subs whose coverage has lapsed. See insurance certificate tracking.

Common mistakes

  1. Misclassifying workers as 1099 subcontractors when the state would treat them as employees. Read construction worker classification: employee vs 1099.
  2. Putting field payroll in a lower-rated class code to cut premium, which can backfire at audit.
  3. Not tracking subs' certificates through the whole job.
  4. Treating safety as separate from insurance. Fewer claims mean a lower experience mod and lower premiums for years. See how to lower your experience modification rate.
  5. Slow claim reporting, which tends to make claims more expensive.

Related terms

Workers comp sits alongside general liability insurance and builder's risk insurance in a contractor's insurance program. For a fuller explanation, read workers compensation for contractors explained. Smart Business Automator tracks each subcontractor's insurance certificates and expiration dates and flags gaps before payment; see subcontractor compliance automation.

Frequently asked questions

Do contractors have to carry workers compensation?

In most states, employers with employees must carry it, but the thresholds and exemptions (for sole proprietors, owners, or very small employers) vary by state. Check your state workers compensation agency.

Who runs workers compensation?

Mostly the states. The U.S. Department of Labor runs federal programs for federal employees and certain other groups, and refers private-sector workers to their state workers compensation board.

Why did my workers comp audit charge me more?

Common reasons are higher actual payroll than estimated, payroll in a higher-rated class, or payments to subcontractors who could not show their own workers comp coverage.

Does workers comp cover subcontractors?

A sub's employees should be covered by the sub's own policy. If the sub has none, the GC's policy may end up responsible in many states, which is why GCs collect certificates.

Sources

  1. U.S. Department of Labor: Workers' Compensation
Written and edited by

Maurice Francois writes and edits construction operations guides for Smart Business Automator. More from Maurice on the Scaling Legends podcast.

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