Construction Workers' Comp: Class Codes That Cost You the Most Money

Construction class codes sit at the high end of the NCCI scopes manual. Roofing, structural steel, demolition, and excavation routinely price above $10 per $100 of payroll, while a residential carpentry crew might run $4 or $5. The class code mix on your payroll is the single biggest premium driver for any contractor. If even 10 percent of your payroll lands in the wrong code at audit, the dollar swing is real money. This post walks through the highest-cost construction class codes, how the rates get set, and the levers a general contractor actually has.

How Construction Class Codes Are Built

The NCCI scopes manual defines class codes nationally. State rating bureaus in California, New York, Pennsylvania, Delaware, and a few others file their own (WCIRB California publishes the California equivalents). Construction codes are scope-of-work specific: carpentry framing is different from interior trim work, which is different from millwright installation. The codes follow the work, not the job title or the contractor. A GC that self-performs concrete codes the concrete labor to concrete; office staff stay on 8810 Clerical.

The Highest-Rate Construction Class Codes

These are the codes that absorb the biggest chunks of premium in a typical commercial GC payroll.

• Code 5551 Roofing. Routinely the highest-rate construction code in most NCCI states. Fall exposure pushes published loss costs above $15 per $100 of payroll in many filings, and carrier appetite is limited.
• Code 5040 Iron or Steel Erection, Structural. Frequently above $10 per $100 of payroll. Height and rigging exposure dominate the cost curve.
• Code 6217 Excavation and Drivers. OSHA cites trenching collapses as one of the deadliest construction activities. Premium reflects the severity exposure even at moderate frequency.
• Code 5474 Painting NOC. Moderate to high. Lift work and exterior height drive the rate.
• Code 5022 Masonry NOC. Moderate to high. Lifting and lift-truck exposure are the loss drivers.
• Code 5403 Carpentry NOC. Higher than residential carpentry because of structural exposure and scaffolding work on commercial jobs.
• Code 5645 Carpentry, Detached One- or Two-Family Dwellings. Residential framing. Lower-rated than commercial carpentry but still mid-range nationally.

Roofing and structural steel are the two codes where rate spreads between carriers are largest because fewer markets want the exposure. A bad loss year can move your rate 25 to 50 percent at renewal.

Why the Same Code Costs Different Amounts by State

Loss costs are filed annually by NCCI or by independent state bureaus. Recent California filings priced roofing well above the same code in several Mountain West states, because California's claim severity (medical and indemnity) runs higher and the state's permanent disability schedule is more generous. The Loss Cost Multiplier (LCM) layered on top varies by carrier; two carriers writing the same code in the same state can sit 30 percent apart. Schedule credits and debits, plus your experience modification, finish the math. A roofing contractor with a 1.25 experience mod pays 25 percent more than the same shop at 1.00 doing identical work.

Audit Risk and Payroll Splits

Audit findings are where construction workers' comp premium actually gets decided. The default rule on most policies is simple: an employee who performs work in more than one class code during a pay period gets the highest-rated code unless you have written records that document the split. For a construction operation running across roofing, framing, and finish work, that default can move a six-figure payroll into a code that doubles the rate.

• Daily timesheets by task. Foreman-signed records that show actual hours worked in each scope, organized by job. The carrier's auditor wants to see them organized in a way that ties back to payroll.
• Subcontractor certificates of insurance. Any uninsured sub gets pulled into your audit at the appropriate construction code. A clean COI file is one of the easiest premium savings most GCs leave on the table.
• Owner and officer exclusions. Most states let owners or officers opt out, which removes their payroll from the calculation. Rules vary by state, so confirm with your agent before the audit, not after.
• Overtime payroll treatment. Most NCCI states reduce overtime payroll to straight-time for class code calculation, but only if your records show the gross overtime separately.

How TruPoint Approaches Construction Workers' Comp

We pull the carrier's loss cost filing alongside your class code mix before marketing renewal, so you see which carriers actually want your scopes and which are pricing to decline. For our construction insurance clients, we build a payroll-by-code worksheet that matches your timekeeping, so the audit is the audit, not a surprise. We track your experience mod and intervene early on adverse claim trends, including reserve disputes with the carrier when reserves look inflated. For higher-hazard scopes (roofing, structural steel, demolition), we evaluate monoline placements with state funds or specialty carriers against a packaged BOP, so you see the real cost of each option.

Additional Resources

• NCCI Scopes Manual and Loss Cost Filings
• OSHA Construction Industry Resources
• Associated General Contractors of America (AGC) Safety and Workforce Reports
• CDC NIOSH Construction Topic Page
• WCIRB California (State-Bureau Filings)
• Travelers Construction Industry Risk Resources

Disclaimer

The information contained in this article is provided for general informational purposes only and should not be construed as legal, tax, or insurance advice on any specific matter. Coverage availability, terms, and premium vary by carrier, state, and individual risk profile. TruPoint recommends consulting a licensed insurance professional before making coverage decisions.