The definition of workers compensation starts with a simple exchange: employers fund insurance that pays injured workers, and in return, workers give up the right to sue. For general contractors running construction projects, this exchange carries higher stakes than in any other industry. Construction accounts for 21% of all workplace fatalities in the United States, according to BLS data from 2024, yet only represents 6% of the total workforce.

This pillar guide breaks down every component of workers compensation that matters to GCs. We cover what the insurance pays for, how construction class codes determine premiums, what an experience modification rate signals about a subcontractor, and why failing to verify a sub's coverage can make you the liable employer.

What Workers Compensation Insurance Covers

Workers compensation insurance pays for five categories of benefits when a worker gets injured on the job or develops an occupational illness.

Medical expenses. All treatment related to the injury, from the emergency room visit through surgery, physical therapy, and prescription drugs. The average construction injury medical claim reached $39,800 in 2024, according to NCCI data.

Lost wages. Temporary disability benefits typically replace 66% of the worker's average weekly wage, up to a state-set maximum. In California, the 2025 maximum weekly benefit is $1,619.15. In Texas, it is $1,133.

Permanent disability. When injuries cause lasting impairment, the worker receives additional compensation based on a disability rating. A construction worker who loses a hand may receive 150 to 250 weeks of benefits depending on the state.

Vocational rehabilitation. If a worker cannot return to their previous role, WC pays for retraining and job placement. About 12% of construction WC claims involve rehabilitation services.

Death benefits. When a workplace fatality occurs, WC pays funeral expenses (typically $5,000 to $15,000 depending on state) and ongoing income replacement to dependents.

Benefit Type	What It Covers	Typical Construction Value
Medical expenses	All injury-related treatment	$39,800 average claim
Temporary disability	Wage replacement during recovery	66% of weekly wage
Permanent disability	Lasting impairment compensation	150-250 weeks (varies by injury)
Vocational rehab	Retraining for new occupation	12% of claims use this
Death benefits	Funeral costs + dependent income	$5,000-$15,000 funeral + ongoing

How Workers Compensation Works in Construction: Class Codes

Every construction trade gets assigned a class code by the National Council on Compensation Insurance (NCCI) or the state's rating bureau. These codes determine the base premium rate per $100 of payroll.

The rates vary enormously because different trades carry different injury risks. A carpenter working at height faces more exposure than an electrician doing finish work, and the class codes reflect that difference.

Key construction class codes and their approximate rates (per $100 payroll):

Class Code	Trade Description	Typical Rate Range
5403	Carpentry	$8.50-$15.20
5606	General Contractor (project management)	$3.10-$7.40
5190	Electrical wiring	$4.20-$8.60
5213	Concrete work	$7.80-$14.50
5551	Roofing	$18.00-$35.50
5022	Masonry	$9.10-$16.70
5437	Finish carpentry/cabinet installation	$5.60-$9.80
5183	Plumbing	$5.10-$9.40

When a sub carries the wrong class code, they pay premiums that do not match their actual risk. If a roofer (5551) is misclassified as a finish carpenter (5437), their carrier may deny claims or seek reimbursement from the GC.

You should verify that every sub's certificate of insurance shows class codes matching the work they perform on your project.

The Experience Modification Rate (EMR/MOD)

The experience modification rate compares a company's actual loss history against the expected losses for their class codes. An EMR of 1.0 means the company matches the industry average. Below 1.0 means better than average safety performance. Above 1.0 means worse.

EMR directly multiplies the base premium. A contractor with a $50,000 base premium and an EMR of 1.35 pays $67,500. The same contractor with a 0.80 EMR pays $40,000.

For GCs, a sub's EMR signals their safety culture. Many project owners require all subs to carry an EMR below 1.0. An EMR above 1.2 often disqualifies a sub from bidding on federal, institutional, or large commercial projects.

EMR benchmarks for sub evaluation:

EMR Range	Safety Signal	GC Action
Below 0.75	Top-tier safety program	Preferred subcontractor
0.75-0.99	Better than industry average	Standard approval
1.00-1.19	Average to slightly elevated risk	Request safety plan review
1.20-1.49	Elevated risk	Require additional safety measures
1.50+	High risk	Consider disqualification

Monopolistic vs. Competitive State Systems

Not every state allows private insurers to write workers compensation policies. Understanding the difference matters when you operate across state lines.

Monopolistic states. Ohio, North Dakota, Washington, and Wyoming require employers to purchase WC through the state fund. No private carrier option exists. If your sub operates in these states, their certificate of insurance will show the state fund as the carrier. Standard ACORD certificates may look different because state fund documentation follows state-specific formats.

Competitive states. The remaining 46 states (plus D.C.) allow private carriers, state funds, or both. In competitive states, employers choose from dozens of carriers. California, New York, and Texas each have state funds that compete alongside private insurers.

Self-insurance. About 20% of states allow qualifying employers to self-insure for WC. These employers must demonstrate financial capacity, typically $5 million or more in net worth, and post a surety bond. If your sub is self-insured, request proof of their self-insurance certificate and confirm it is current with the state's self-insurance office.

Why GCs Must Verify Every Sub's Workers Compensation Coverage

The statutory employer doctrine creates direct liability for GCs when subs fail to carry workers compensation insurance.

Here is how it works. If a sub's employee gets injured and the sub has no WC coverage, the injured worker can file a claim against the GC. Under statutory employer laws (active in 38 states), the GC becomes the default employer for WC purposes. The GC's own WC policy pays the claim, and the GC's EMR takes the hit.

In 2024, the average WC claim in construction cost $42,000. A single uninsured sub incident can increase a GC's EMR by 0.05 to 0.15 points, driving up premiums for three years.

The financial chain reaction of one uninsured sub:

Worker injury on your project: $42,000 average claim cost
Your EMR increases by 0.10 points (example)
Your annual premium increases by approximately $5,000-$12,000
The EMR impact stays on your record for 3 years
Total cost: $57,000-$78,000 from one incident

This is why verification is not optional. Every sub, every project, every time.

What Is Workers Compensation Coverage: Key Policy Components

When you review a sub's WC certificate, you need to understand what the policy actually covers.

Part One: Workers Compensation. This section pays statutory benefits to injured employees. Coverage limits match whatever the state requires. There is no dollar cap listed because the policy pays whatever the law mandates.

Part Two: Employers Liability. This section covers lawsuits from injured workers who claim negligence beyond what WC provides. Standard limits are $100,000 per accident, $500,000 aggregate disease, and $100,000 per employee disease. Many GC contracts require higher limits of $1,000,000 each.

Part Three: Other States Coverage. This section extends coverage to states not listed in the policy declarations. If your sub works across state lines, confirm Part Three includes every state where they will perform work on your project.

Review the additional insured endorsement on the sub's general liability policy alongside their WC certificate. WC policies do not carry additional insured endorsements, but the GL policy should name you as additional insured for completed operations.

Check for waiver of subrogation endorsements on the WC policy. This prevents the sub's WC carrier from suing you to recover claim payments. Most GC contracts require this endorsement, and it must be in place before work begins.

Excluded Officers and Partners: A Hidden Risk

Many WC policies allow company owners, officers, and partners to exclude themselves from coverage. In sole proprietorships and LLCs, this is common because it reduces premiums.

The problem arises when excluded owners work on your job site. If an excluded owner falls from scaffolding, they have no WC coverage. They may pursue a personal injury lawsuit against you instead, bypassing the WC system entirely.

Forty-three states allow officer exclusions. Only seven states (including California and New York) require all officers of corporations to be covered.

What to verify on every sub's certificate:

Confirm no officers or partners are excluded if they perform work on site
Request the exclusion endorsement page to see exactly who is excluded
Add contract language requiring all on-site personnel to be covered under WC
Verify annually because exclusions can change at policy renewal

How We Help GCs Verify Workers Compensation Compliance

At SubcontractorAudit, we automate the verification process that this guide describes. Our platform reads WC certificates, checks class codes against the work scope, monitors EMR data, flags excluded officers, and sends alerts before policies expire.

You set your compliance requirements once. We verify every sub against those requirements continuously.

See how COI tracking works

Frequently Asked Questions

What is the basic definition of workers compensation? Workers compensation is a state-mandated insurance program where employers pay premiums to cover medical expenses, lost wages, and disability benefits for employees injured on the job. In exchange, employees give up the right to sue their employer for workplace injuries. All 50 states require WC for most employers, though specific requirements vary by state.

Do independent contractors need workers compensation? Independent contractors (1099 workers) are generally not required to carry WC for themselves. However, if a worker is misclassified as a 1099 when they should be a W-2 employee, the hiring employer owes WC coverage. The IRS and state agencies reclassify an estimated 10-30% of 1099 workers in construction as employees upon audit.

What happens if my subcontractor does not carry workers compensation? In 38 states with statutory employer laws, the GC becomes responsible for the injured worker's WC benefits. Your own WC policy pays the claim, your EMR increases, and your premiums rise for three years. In some states, you also face fines of $1,000 to $10,000 per day for each uninsured worker on site.

How do I verify a subcontractor's workers compensation coverage? Request a current ACORD certificate of insurance showing WC coverage. Verify the policy period has not expired, class codes match the work being performed, no officers who work on site are excluded, and the policy covers the state where work occurs. Contact the carrier directly or use a compliance platform to confirm the policy is active and has not been cancelled.

What is an experience modification rate and why does it matter? The EMR compares a company's actual WC claim history against the expected claims for their industry classification. An EMR of 1.0 equals the industry average. Below 1.0 indicates better safety performance and lower premiums. Above 1.0 indicates worse performance and higher premiums. GCs use EMR to evaluate sub safety. Many owners require all subs to maintain an EMR below 1.0.

Can a subcontractor's workers compensation claim affect my insurance? Yes, if the sub is uninsured or underinsured and you are deemed the statutory employer. Your policy pays the claim, which increases your EMR and premiums. Even when subs carry proper coverage, a pattern of claims on your projects may cause your carrier to increase rates or non-renew your policy. Tracking sub EMRs before awarding contracts reduces this exposure.