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Workers’ Compensation Insurance Requirements in Connecticut
Connecticut mandates workers’ comp from your first employee and carries some of the highest trade rates in the nation — Trade Safe gets contractors compliant fast without overpaying.
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Workers’ Compensation Insurance Requirements in Connecticut
Connecticut’s workers’ comp system triggers the moment you hire your first employee, and its premium index consistently ranks among the top ten most expensive in the country. For roofing, concrete, and carpentry crews especially, understanding the real cost drivers before you shop coverage can save serious money.
Connecticut Workers’ Compensation Legal Requirements
Under Connecticut General Statutes § 31-284(a), any employer with one or more employees — full-time or part-time — must carry workers’ compensation insurance; sole proprietors with no employees are not required to cover themselves.
- Coverage is mandatory from the first employee, part-time or full-time
- Sole proprietors and partners may elect not to cover themselves, but must cover any employees they hire
- Uninsured employers face fines up to $300 per employee per day, capped around $50,000, plus possible stop-work orders
- Willful noncompliance can be charged as a Class D felony
How Connecticut’s Workers’ Comp System Works
System type: Private Carrier Market
Connecticut is a private-carrier, competitive state where employers purchase coverage on the open insurance market. In the Oregon DCBS 2024 study, Connecticut ranked 6th of 51 jurisdictions overall, with an index rate at 135% of the national median — making it one of the more expensive states for workers’ comp coverage, especially for construction trades.
How Connecticut’s Rates Compare by Trade
| Trade (NCCI Class Code) | National Rank (of 51) | Rate per $100 of Payroll |
|---|---|---|
| Roofing (Class 5551) | 3rd of 51 | $18.34 |
| Electrical Wiring (Class 5190) | 8th of 51 | $3.21 |
| Plumbing NOC (Class 5183) | 5th of 51 | $4.14 |
Source: Oregon Dept. of Consumer and Business Services, 2024 Workers’ Compensation Premium Rate Ranking Study (published June 2025) — the only study benchmarking all 50 states plus DC on a common industry mix.
Filing a Workers’ Comp Claim in Connecticut
Injured employees must notify their employer as soon as practicable, and the claim is filed with the Connecticut Workers’ Compensation Commission, which oversees the state’s decentralized district-office claims process. Employers or their carriers must report the injury and begin the claims process promptly to avoid commission penalties.
Penalties for Non-Compliance
Connecticut can issue a stop-work order shutting down the business, fine employers up to $300 per employee per day of noncompliance (up to $50,000), and pursue a Class D felony charge for willful violations under CGS § 31-288.
Resources: Connecticut Workers’ Compensation Commission, CGA Office of Legislative Research — Sole Proprietors and Workers’ Comp, Connecticut General Statutes § 31-284
How Much Does Workers’ Comp Insurance Cost in Connecticut?
Connecticut’s trade rates run well above the national median across the board, with roofing standing out as one of the priciest classifications in the country. Electrical and plumbing crews still pay a premium compared to lower-cost states.
| Trade | Estimated Cost per $100 Payroll | What Drives It |
|---|---|---|
| Roofing | $18.34 (per the Oregon study’s Class 5551 rate) | High claim severity and medical/wage-replacement costs push Connecticut roofing to the 3rd-highest rate nationally |
| Electrical | $3.21 (Class 5190) | Above-median rate reflecting the state’s overall high cost of workers’ comp coverage |
| Plumbing | $4.14 (Class 5183) | Ranks 5th nationally, driven by the same statewide cost pressures affecting all Connecticut trades |
What Moves the Price Up or Down
- Experience modification factor — safety track record has an outsized effect in a high-cost state like Connecticut
- Payroll size — since premium is calculated per $100 of payroll, larger crews mean larger premiums
- Claims history and medical cost trends specific to Connecticut’s healthcare and wage-replacement environment
- Trade classification — Connecticut’s roofing, concrete, and carpentry rates rank among the highest in the nation
These figures come from the Oregon DCBS 2024 Workers’ Compensation Premium Rate Ranking Study and are benchmark index rates, not a quote. Actual premium depends on your experience mod, claims history, and payroll — get a real quote from Trade Safe.
Frequently Asked Questions
Does Connecticut require workers’ comp for just one employee?
Yes. Connecticut law requires coverage the moment you have one employee, whether full-time or part-time.
Do Connecticut sole proprietors have to cover themselves?
No, sole proprietors and partners with no employees can elect not to carry coverage on themselves, but must cover any employees they hire.
Why are Connecticut’s roofing rates so high?
Per the Oregon DCBS study, Connecticut ranks 3rd nationally for roofing (Class 5551) at $18.34 per $100 of payroll, reflecting high claim severity and cost of care in the state.
What are the penalties for skipping workers’ comp in Connecticut?
Employers can face fines up to $300 per employee per day (capped near $50,000), a stop-work order, and willful violations can be prosecuted as a Class D felony.
Requirements and rates change over time — always verify current rules with the Connecticut Workers’ Compensation Commission.
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