Workers' comp for roofers: why is it expensive and how is it priced?

Roofing workers' compensation is one of the most expensive lines in all of construction because roofers are classified as high-hazard. Premiums are driven mainly by your trade's class code rate, your payroll, and your claims history (the experience modification rate). Depending on the state, roofing rates commonly run $24 to $80 per $100 of payroll — multiples of what office or lower-risk trades pay.

The reason is the underlying danger. Falls are the leading cause of death in construction: in 2024 there were 389 fatal falls to a lower level out of 1,034 construction fatalities, per OSHA's reporting of BLS data. Because roofing claims tend to be both frequent and severe, insurers price the class accordingly.

How a roofing premium is actually calculated

Workers' comp premium follows a simple formula: (Payroll ÷ $100) × class-code rate × experience modification rate (EMR). Most roofing operations fall under NCCI class code 5551 ("Roofing — All Kinds"), which applies to all kinds of roofing work — flat, sloped, or built-up. A handful of states use their own codes: California uses 5552, while Delaware and Pennsylvania use 659, according to insurance guidance on roofing class codes.

The class-code rate is the base cost per $100 of payroll for roofers in your state. Your EMR then multiplies that base up or down based on your three-year loss history. As one NCCI experience-rating explainer notes, a modifier of 1.00 is neutral, 1.25 adds a 25% surcharge, and 0.75 gives a 25% discount. For roofers, the EMR is the single biggest controllable cost lever — a clean safety record materially lowers your premium, while a few severe claims can push it well above 1.00.

What drives roofing premiums up

• Fall exposure and claim severity. Roofing routinely ranks among the most dangerous occupations, and severe injuries mean large, hard-to-price claims.
• State of operation. The same class code can cost very differently state to state, which is why the $24–$80 per $100 range is so wide.
• Payroll and job mix. Premium scales directly with payroll; steep or commercial work tends to carry higher rates than light residential repair.
• Your EMR. Past claims follow you for three years and directly multiply the base rate.

State requirements

Most states require workers' compensation as soon as you hire your first employee, and roofing is often singled out for stricter rules. California is the clearest example: the state's licensing board confirms that all active C-39 Roofing contractors must carry workers' compensation insurance or a valid Certification of Self-Insurance, whether or not they have employees, and roofing contractors cannot file for an exemption. Always confirm the rule in your own state before bidding work, since penalties for going uninsured can include stop-work orders and license loss.

Workers' comp sits alongside the other coverages roofers carry — see our overview of roofing business insurance and how general liability for roofers differs from comp. Because your EMR is shaped by claims, tight job-site safety and payroll controls — covered in our workers' comp and payroll safety guide — are the most direct way to bring premiums down over time.

Sources

• OSHA — Stop Falls (BLS construction fatality data, 2024)
• Work Comp Associates — NCCI Class Code 5551
• 1800insurance — Workers' Comp for Roofing Contractors: Costs & Requirements
• Cutcomp — Experience Rating / NCCI Mod Formula
• CSLB — Workers' Compensation Requirements (C-39 Roofing)