Workers’ Comp Class Codes for Construction Contractors

Workers’ compensation class codes group employees by the work they perform and the risks connected to that work.

Each class code has its own insurance rate. A roofer usually receives a different rate from an office administrator because their injury risks are very different.

For contractors, correct class codes are essential. They affect the estimated premium, final audit, and experience rating. An incorrect code can cause overpayment or a large bill after the policy ends.

Workers’ Comp Class Codes at a Glance

Question	General answer
What is a class code?	A numerical category for a type of business operation or job exposure
Why does it matter?	Each code has its own workers’ compensation rate
Who assigns the code?	The insurer applies the state’s approved classification rules
Can one contractor have several codes?	Yes, when separate operations qualify
Can one employee have several codes?	Sometimes, but detailed time records may be required
Are codes the same nationwide?	No; state rules, descriptions, and exceptions can differ
Is a job title enough?	No; actual duties and business operations matter
Can the code change after an audit?	Yes
Is a class code the same as a NAICS code?	No
Can contractors challenge a code?	Usually, through the insurer and state classification process

NCCI provides a Class Look-Up tool for classification codes, approved phraseology, state variations, and rate history. However, contractors must still apply the rules for the state where their employees work.

How Workers’ Compensation Class Codes Work

A class code connects a type of work with its expected injury cost.

Workers who face similar hazards are grouped together. Insurers then use loss data from that group to help develop workers’ compensation rates.

For example, employees who perform roofing work face risks such as falls, heat exposure, and material handling. Office employees usually face lower physical risks.

As a result, roofing classifications normally carry a higher rate than clerical classifications. NCCI has reported that Code 5551 for roofing has much higher claim frequency per payroll than Code 8810 for clerical office employees.

How Class Codes Affect the Premium

Workers’ compensation rates are usually stated as an amount per $100 of payroll.

The basic calculation is:

Payroll ÷ 100 × Class Code Rate = Base Premium

Suppose a contractor has $200,000 of payroll under a code with a $5.00 rate.

The calculation would be:

$200,000 ÷ 100 × $5.00 = $10,000

Other factors can change the final price. These may include the experience modifier, schedule rating, state assessments, and policy fees.

Texas explains that insurers assign payroll to the appropriate classifications. They then multiply each classification’s payroll by its rate per $100.

Common Construction Class Codes

The following codes are common examples in jurisdictions that use NCCI classifications.

However, contractors should not select a code from this table without checking their state manual. Phraseology and rules may differ by state.

Code	Common description
0042	Landscape gardening and drivers
5022	Masonry, not otherwise classified
5183	Plumbing, not otherwise classified, and drivers
5190	Electrical wiring within buildings and drivers
5403	Carpentry, not otherwise classified
5437	Installation of cabinet work or interior trim
5445	Drywall, wallboard, or plasterboard installation
5474	Painting, not otherwise classified
5537	HVAC and refrigeration installation, service, and repair
5551	Roofing of all kinds and drivers
5606	Certain construction project managers and executive supervisors
5645	Residential carpentry for qualifying dwellings
6217	Excavation and drivers
8810	Clerical office employees
8742	Outside salespersons or collectors

Official NCCI materials identify many of these classifications, including plumbing, electrical wiring, roofing, residential carpentry, excavation, drywall, painting, and construction project management.

These descriptions are simplified. The full classification scope may include detailed inclusions, exclusions, and state exceptions.

What Does “NOC” Mean?

“NOC” means not otherwise classified.

Insurers use an NOC code when the business operation fits that general category but does not qualify for a more specific classification.

For example, Code 5403 covers certain carpentry operations not described by another applicable carpentry code. NCCI’s scope for Code 5403 includes qualifying commercial carpentry and other general carpentry work.

An NOC code should not be treated as a catch-all option. The insurer must first check whether a more specific code applies.

Are Class Codes Based on the Company or Each Employee?

The answer depends on the classification rules.

Workers’ compensation classification generally begins with the employer’s business operations. The insurer identifies what the company does and which classifications describe those operations.

It then assigns employee payroll under the applicable codes.

For example, a plumbing contractor’s field operations may fall under a plumbing classification. A separate office employee may qualify for a clerical code.

California’s WCIRB explains that insurers classify the employer’s business rather than choosing a code based only on an employee’s occupation. A plumbing contractor, for instance, receives the applicable plumbing classification for its plumbing operations.

Can a Contractor Use More Than One Class Code?

Yes.

A contractor may qualify for several class codes when the company performs distinct operations.

For example, a remodeling company might have:

Carpentry employees
Painting employees
Electrical employees
Clerical office employees
Outside sales employees

However, insurers do not separate every small task automatically.

The operations must meet the classification rules. In addition, the contractor must maintain reliable payroll and time records.

Without proper records, the insurer may assign payroll to the higher-rated applicable classification.

WCIRB states that employers must keep records showing the time an employee spends in each operation when payroll division is allowed. Otherwise, all payroll may go to the highest-rated classification.

Can One Employee Have Two Class Codes?

Sometimes.

Suppose an employee spends part of the week painting and the rest performing carpentry. The insurer may allow payroll division when the state rules permit it.

However, the contractor usually needs daily records showing:

Employee name
Date worked
Hours in each operation
Jobsite
Type of work performed
Payroll assigned to each classification

A rough estimate created at the end of the month may not satisfy the rules.

WCIRB allows payroll division in certain cases when the employer records the employee’s actual working time in each operation.

What Happens Without Time Records?

The insurer may place all of that employee’s payroll under the highest-rated applicable code.

For example, an employee might perform lower-rated interior work and higher-rated roofing work. Without clear records, the insurer may apply the roofing classification to all wages.

Therefore, accurate timekeeping can have a major effect on premium.

What Are Standard Exception Classifications?

Standard exceptions are classifications that may apply across many industries.

The two most common examples are:

Code 8810: Clerical office employees
Code 8742: Outside salespersons or collectors

These workers must meet strict requirements.

Clerical Office Employees

A clerical employee generally needs to work in a separate office environment and perform clerical duties exclusively.

Typical duties may include:

Bookkeeping
Scheduling
Billing
Data entry
Telephone work
Recordkeeping

An employee who also visits active jobsites, loads materials, or performs field work may not qualify.

WCIRB states that most businesses may use standard exception classifications for employees who perform exclusively clerical or outside sales work.

Outside Sales Employees

An outside salesperson generally spends time away from the business premises selling, estimating, or meeting customers.

However, the employee may lose eligibility if they also supervise construction, deliver materials, or perform labor.

NCCI identifies Codes 8810 and 8742 as standard exception classifications. It also reports that these codes often receive close review during classification inspections.

How Are Construction Supervisors Classified?

Construction supervision can create classification problems.

The correct code depends on what the supervisor actually does.

Working Supervisors

A working supervisor who performs trade labor will often receive the same classification as the crew.

For example, a roofing foreman who installs shingles may remain under the roofing code.

Non-Working Supervisors

A supervisor who only directs work may qualify for a separate classification under certain rules.

Code 5606 can apply to qualifying project managers, construction executives, construction managers, and construction superintendents. However, the employee must meet the classification’s restrictions.

An impressive job title does not guarantee the lower-rated code. Actual duties still control.

WCIRB also distinguishes between working supervisors, non-working supervisors, and executive-level construction managers.

Does a General Contractor Use One General Contractor Code?

Not always.

A contractor that performs work with its own employees will usually need the classifications for those operations.

For example, a general contractor may directly employ:

Carpenters
Concrete workers
Painters
Equipment operators
Project managers

Each qualifying operation may require its own code.

A contractor that subcontracts all construction may receive different treatment. However, that classification requires the contractor to meet specific rules.

A company cannot simply choose a “general contractor” code because it manages several trades.

Do Subcontractors Affect Class Codes?

Yes.

Workers’ compensation auditors often review payments to subcontractors.

When a subcontractor has valid workers’ compensation coverage, the general contractor may avoid including that subcontractor’s employees under its own policy.

However, uninsured subcontractors can create added exposure.

The auditor may request:

Workers’ compensation certificates
Subcontracts
Invoices
Payment records
Contractor licenses
Owner exemption documents

If the contractor cannot prove coverage, the insurer may classify the subcontractor’s work as though the contractor’s employees performed it.

Texas classification guidance states that uninsured contractor payroll may receive the classification that applies to the work performed.

Class Codes vs. NAICS Codes

Workers’ compensation class codes are not the same as NAICS codes.

Workers’ Compensation Class Codes

These codes help insurers:

Group similar risks
Assign rates
Calculate premiums
Report loss experience

NAICS Codes

NAICS codes classify businesses for economic and statistical purposes.

A construction company may have one primary NAICS code but several workers’ compensation class codes.

Therefore, contractors should not copy a NAICS code into the workers’ compensation application.

Why Class Codes Vary by State

Workers’ compensation is regulated at the state level.

Many states use NCCI classification resources. However, states may adopt special rules, exceptions, or different descriptions.

California uses classifications published through WCIRB. New York uses its own classification system through NYCIRB.

California also uses dual-wage classifications for several construction trades. These rules may place workers in different codes based on documented hourly wages.

For example, California maintains separate wage-based classifications for trades such as roofing, plumbing, and electrical work.

This is why an online code list cannot replace a state-specific review.

What Is the Governing Classification?

The governing classification is usually the basic classification that produces the greatest amount of payroll at a job or location.

Standard exception codes, such as clerical office employees, are normally excluded from that comparison.

NCCI defines the governing code as the basic classification at a job or location that produces the greatest payroll.

New York uses a similar concept in its current classification rules.

The governing classification can affect experience rating and other policy reporting. However, it does not mean every employee receives that code.

What Happens During a Classification Inspection?

An insurer or rating organization may inspect the contractor’s operations.

The inspector may review:

Business activities
Employee duties
Jobsite operations
Payroll records
Websites and advertisements
Customer contracts
Subcontractor use
Equipment
Office separation
Supervision duties

The inspection may confirm the current codes or recommend changes.

NCCI’s classification inspection research shows that employers are sometimes moved to different governing codes after the actual operations are reviewed.

A classification change can affect both current and future premiums.

What Happens at the Final Audit?

Workers’ compensation policies usually begin with estimated payroll and classifications.

At the end of the policy period, the insurer audits the actual exposure.

The auditor may check:

Payroll by employee
Job descriptions
Time cards
Tax reports
General ledger records
Cash labor
Subcontractor payments
Certificates of insurance
Owner status

The final audit may produce an additional premium or a refund.

Texas workers’ compensation rules state that policies are subject to a final payroll audit based on actual payroll and premium exposure.

Common Classification Mistakes

Choosing the Lowest-Priced Code

A contractor cannot choose a code simply because it has a lower rate.

The code must accurately describe the business operation.

Classifying Field Workers as Clerical

A worker who visits jobsites or performs field duties may not qualify for Code 8810.

Using One Code for Every Trade

A remodeling contractor may need separate classifications for carpentry, painting, electrical work, and other operations.

Splitting Payroll Without Records

Insurers may reject payroll divisions that lack detailed time records.

Misclassifying Supervisors

A working foreman usually does not qualify as an office employee or executive supervisor.

Ignoring Subcontractors

Uninsured subcontractor payments can create added premium during the audit.

Using Codes From Another State

A code description may change across state lines.

How to Verify Your Contractor Class Codes

Follow these steps before accepting a quote.

1. Describe Every Business Operation

List all work performed by employees.

Include occasional services, not only the company’s main trade.

2. Review Actual Employee Duties

Do not rely only on titles.

Document what each employee does during a normal week.

3. Separate Payroll Correctly

Maintain daily time records when employees work in multiple operations.

4. Verify Subcontractors

Collect workers’ compensation certificates before work begins.

5. Use the Correct State Manual

Check the classification rules for every state where employees work.

6. Ask for the Full Phraseology

Request the complete class-code description, not only the number.

7. Review the Audit

Compare the final audit with payroll, time cards, and subcontractor records.

Can a Contractor Challenge a Class Code?

Usually, yes.

Start by asking the insurer for a written explanation.

Provide supporting documents such as:

Employee job descriptions
Payroll reports
Time records
Contracts
Photographs
Business procedures
Subcontractor documents

If the disagreement continues, the contractor may have access to a state rating bureau or regulatory appeal process.

Do not delay. Classification disputes often have filing deadlines.

Frequently Asked Questions

Are workers’ compensation class codes the same in every state?

No. States may use different codes, descriptions, rates, and classification rules.

Can a contractor have several class codes?

Yes. Separate operations may qualify for separate classifications.

Can one employee use two codes?

Sometimes. Detailed time records are often required.

Is Code 8810 available for every office employee?

No. The employee must perform qualifying clerical duties and meet separation requirements.

Does a project manager automatically receive Code 5606?

No. Actual responsibilities must satisfy the classification rules.

Do independent subcontractors need class codes?

Their own insurer will classify their operations. Uninsured subcontractor work may affect the hiring contractor’s audit.

Does the class code determine the entire premium?

No. Payroll, rate, experience modifier, credits, assessments, and audits also affect the cost.

Can the insurer change a code after the policy begins?

Yes. An inspection or audit may identify a different applicable classification.

Conclusion

Workers’ compensation class codes group contractor employees according to their work and injury exposure.

Each code has its own rate. Therefore, accurate classifications directly affect the premium.

Construction businesses often need several codes. Field employees, office staff, salespeople, supervisors, and subcontracted operations can receive different treatment.

Contractors should never choose codes based only on job titles or online rate tables. Actual duties, payroll records, and state-specific rules control the result.

Before buying or renewing coverage, review every employee’s work. Then, verify the class codes with a licensed insurance professional.

Good records can prevent overcharges, audit disputes, and unexpected premium bills.

Editorial review: This guide was researched and reviewed by the Coverage Editorial Team using government agencies, insurance regulators, licensing authorities, policy documentation, and current industry pricing sources.