South Carolina Subcontractor Insurance Requirements for General Contractors

TL;DR: South Carolina requires workers' compensation for employers with 4 or more employees, and GCs are financially liable when an uninsured sub's injured worker makes a claim — your own WC carrier pays and then comes after your premium. Keep certificates, verify the 4-employee count, and collect lien waivers within 90 days or you lose lien rights.

South Carolina is a strong construction market — Charleston, Greenville, and the Columbia metro are all growing fast. But the state has a handful of compliance quirks that catch GCs from other states off guard. The 4-employee WC threshold is the biggest one. If you're used to a 1- or 3-employee rule, you may think a small sub doesn't need WC. In SC, that assumption can cost you thousands at audit time.

This guide covers everything a SC general contractor needs to know about subcontractor insurance, licensing, lien waivers, and tax compliance.

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South Carolina Contractor Licensing Requirements

The South Carolina Contractor's Licensing Board (CLB), part of the Department of Labor, Licensing and Regulation (LLR), handles commercial and residential licensing separately.

Commercial Contractors (CLB)

• Required for any project valued at $5,000 or more on commercial or public work
• Four license classifications: General, Mechanical, Electrical, and Specialty
• Applicants must pass a business/law exam and a trade exam
• Must carry general liability insurance with minimum limits set by the CLB
• Renewal is annual (December 31 deadline)

Apply or verify a license at LLR.SC.gov/POL/Contractors.

Residential Contractors

Home builders and remodelers fall under the Residential Builders Commission (RBC), also within LLR. Separate license, separate exam, same underlying principle: you must carry GL insurance to hold the license.

Why This Matters for GCs

Your subcontractors must hold the appropriate SC license if their scope hits the threshold. Using an unlicensed sub on a commercial project over $5,000 creates both project-stop and liability exposure. Before you sign a subcontract, verify the license is active on the LLR portal.

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General Liability Insurance Requirements for South Carolina Subcontractors

SC law doesn't set a universal statewide GL minimum for every contractor, but the CLB has specific minimums tied to license classification and project size. More practically, your contract and your certificate requirements govern.

What to Require from Subs

A reasonable baseline for SC:

Coverage	Recommended Minimum
Commercial General Liability (per occurrence)	$1,000,000
CGL (aggregate)	$2,000,000
Workers' Compensation	Statutory (SC)
Employer's Liability	$100,000 / $500,000 / $100,000
Auto Liability	$1,000,000 CSL

For larger commercial or public projects, increase CGL to $2M/$4M and require umbrella/excess of at least $1M–$5M above the primary.

Additional Insured Status

Your contracts should require subs to add you as an additional insured on their CGL policy — specifically on both the ongoing operations and completed operations endorsements. An ACORD 25 certificate is not enough; you need the endorsement itself (CG 20 10 and CG 20 37, or their equivalent) for the coverage to hold.

Primary and Non-Contributory Language

Require that the sub's policy be primary and non-contributory to your policy. Without this language, if there's a claim, the two carriers can fight over contribution and leave you holding delays and defense costs.

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South Carolina Workers' Compensation Requirements

This is where SC is different from most states.

The 4-Employee Threshold

South Carolina requires workers' compensation coverage when an employer has 4 or more employees — not 1, not 3, but 4. SC Code § 42-1-360.

• "Employees" includes part-time, seasonal, and family members working for wages
• Sole proprietors and partners are excluded by default but may elect to be covered
• Corporate officers are included by default but may elect to exclude themselves (must file the election with the SC Workers' Compensation Commission)

Practical example: A framing sub with the owner and two employees = 3 people. No WC required. But if they add a fourth worker for your project, they cross the threshold.

This creates a tracking problem. A sub may have 3 employees when you collect their COI, then bring a fourth person on-site halfway through the job. You need certificates dated to the project, and you should ask directly: "How many employees do you have?"

Monopolistic State? No

South Carolina is not a monopolistic state — subs can buy WC from any admitted carrier.

GC Liability for Uninsured Sub Employees

SC Code § 42-1-400 is the provision that keeps GCs up at night: if a subcontractor is not covered by workers' compensation and one of their workers is injured, the GC is treated as the employer of last resort. Your WC policy pays the claim. Your carrier then has the right to recover from the sub, but good luck if they're a small operation with no assets.

The financial hit comes in two forms:

1. The injury claim itself (medical + indemnity)
2. Your WC audit adjustment — uninsured sub payroll is added to your payroll base, often at a high classification rate

The average WC audit adjustment for a GC runs about $9,755 nationally; in SC, where construction classification rates are significant, it can run well above that depending on how much sub payroll gets reclassified.

What to Collect from Every Sub

1. Certificate of Insurance (ACORD 25) showing WC policy in force
2. Policy number, carrier name, and expiration date
3. Effective dates that cover your project duration
4. Your company listed as the certificate holder

Set calendar reminders for expiration dates. A 90-day advance alert gives you time to demand renewal before the policy lapses mid-project.

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South Carolina Lien Waiver Rules

South Carolina's construction lien law is found in SC Code §§ 29-5-10 through 29-5-440 (the SC Mechanics Lien Law and the Notice of Project Commencement Act).

Deadline: 90 Days

A subcontractor, supplier, or sub-sub must file a Notice of Mechanic's Lien within 90 days of the last date they furnished labor or materials. Miss this window and the lien right is gone.

For GCs, this means collecting lien waivers at every payment milestone — don't wait until the job closes. If a sub gets paid in three draws, collect a partial conditional waiver at each draw and a final unconditional waiver at final payment.

Conditional vs. Unconditional Waivers

SC doesn't prescribe a mandatory statutory form (unlike some states), but your waivers should clearly distinguish:

• Conditional waiver: Releases lien rights conditioned on the check clearing. Use this when you hand over the check.
• Unconditional waiver: Releases lien rights with no conditions. Get this only after you've confirmed payment has cleared.

Using an unconditional waiver before payment clears is a common mistake that leaves you exposed if the sub disputes payment later.

Notice of Project Commencement

For projects exceeding $10,000, owners (and GCs acting as general contractors on private commercial projects) can file a Notice of Project Commencement at the county Register of Deeds. This triggers a requirement that sub-tiers serve a Notice of Furnishing on the GC to preserve lien rights. File the Notice of Commencement early — it's a powerful tool to manage lien exposure from lower tiers you don't even know about.

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W-9 Collection and 1099-NEC Obligations in South Carolina

South Carolina follows federal IRS rules for 1099 reporting — there's no separate SC 1099 program layered on top.

Collect a W-9 Before First Payment

Every subcontractor paid $600 or more in a calendar year requires a 1099-NEC. The only way to file accurately is to have a valid W-9 on file before you cut the first check. Waiting until January is a compliance trap.

IRS penalties for missing or late 1099s: $310 per form (for returns more than 30 days late or never filed). If the IRS determines intentional disregard, the penalty jumps to $630 per form with no cap.

Backup Withholding (24%)

If a sub refuses to provide a W-9 or provides one with an incorrect TIN, you are required to withhold 24% of every payment and remit it to the IRS. This applies regardless of how much the sub protests. It's not optional.

SC Department of Revenue (SCDOR) receives a copy of all 1099s filed federally. SCDOR may also require SC1099 reporting for certain payments — check SCDOR's current guidance if you have high-volume reporting obligations.

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South Carolina Workers' Comp Exemptions

Some subs will hand you an exemption form instead of a WC certificate. Here's what's legitimate in SC:

Sole Proprietors and Partners

Automatically excluded from WC coverage under SC law. They don't need to file anything — they're simply not covered by default. You can ask them to sign a written acknowledgment of their excluded status.

Corporate Officers

Included by default. To exclude themselves, officers must file an election of exclusion with the SC Workers' Compensation Commission. The exclusion applies only to named officers — other employees remain covered.

If a sub's "WC exemption" is a printed statement from an officer who never filed with the SC WCC, that's not a valid exemption. Request the filed election paperwork.

Risk for GCs

SC § 42-1-400 applies even to workers of exempted sole proprietors if they bring helpers onto your job. If a sole proprietor sub shows up with a helper they're paying in cash, that helper is potentially a statutory employee of yours for WC purposes.

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South Carolina-Specific Risks and Quirks

Coastal and Hurricane Zone Work

The Charleston and Myrtle Beach areas require contractors to comply with stricter building codes (ASCE 7 wind loads, SFHA flood zone requirements). Insurance requirements on coastal projects — especially roofing and exterior — often include higher GL limits and sometimes Builders Risk requirements. Confirm with the project owner and your own carrier before signing subs.

SCDOT Public Works

South Carolina DOT projects and other public contracts require prevailing wage compliance on federally funded work (Davis-Bacon applies). State-funded SCDOT work does not have a separate SC prevailing wage law — but federal funding triggers federal requirements. Verify funding sources before assuming a public project is exempt.

Licensed Sub Verification

SC's LLR database lets you verify a sub's license status in real time. A license that was active when you hired the sub can lapse mid-project. Build quarterly reverification into your compliance workflow, not just at onboarding.

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South Carolina Compliance Checklist

Use this before issuing the first payment on any SC subcontract:

• Verified sub's SC contractor license is active on LLR.SC.gov
• Collected ACORD 25 COI with current GL policy
• COI shows policy limits meeting contract requirements
• Additional insured endorsement (CG 20 10 / CG 20 37) received — not just the certificate
• Primary and non-contributory language confirmed
• Confirmed sub has WC coverage if 4+ employees (or confirmed exclusion documentation)
• WC certificate expiration date logged — reminder set 90 days out
• W-9 collected and TIN validated before first payment
• Lien waiver process established (conditional at payment, unconditional at final)
• Notice of Project Commencement filed if project exceeds $10,000

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How PaperBoss Helps SC General Contractors

Managing COI expiration dates, WC thresholds, and lien waiver timelines across a roster of subs is genuinely hard to do in a spreadsheet — especially when the 4-employee rule means a sub's WC status can change between draws.

PaperBoss centralizes all of it: certificates, W-9s, lien waivers, and expiration alerts in one place built for GCs. When a policy is about to expire, you get an automatic reminder. When a new sub comes on, there's a checklist to make sure you don't miss the W-9 before the first check goes out.

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Frequently Asked Questions

How many employees does a South Carolina subcontractor need before workers' comp is required?

Four employees. SC is one of the few states with a 4-employee threshold for WC. An employer with 3 or fewer workers — including part-time and family members — is not legally required to carry workers' compensation insurance. However, GCs should still collect a written acknowledgment of exempt status, because the 4th worker can show up without notice.

Who is liable if an uninsured subcontractor's worker is injured on my SC jobsite?

Under SC Code § 42-1-400, you are. The GC becomes the statutory employer of last resort when a sub lacks required WC coverage. Your WC carrier pays the claim and then adds the sub's uninsured payroll to your audit, increasing your premium. Always verify WC coverage before work begins.

What is the lien filing deadline in South Carolina?

90 days from the last date labor or materials were furnished. Sub-tiers (subs of subs, suppliers) have the same 90-day window. Collect conditional lien waivers at each progress payment to reduce your exposure as the job progresses.

Does South Carolina require a specific lien waiver form?

No. SC doesn't prescribe a mandatory statutory form. You can use your own form, but it should clearly specify whether the waiver is conditional (depends on payment clearing) or unconditional (no conditions), the project address, the payment amount, and the period covered.

Can a corporate officer of a South Carolina sub be exempt from workers' comp?

Yes, but only if the officer has filed a formal election of exclusion with the SC Workers' Compensation Commission. A self-prepared letter or verbal claim of exemption doesn't count. Request the filed election documentation before accepting the exemption.

What are the minimum GL insurance limits for SC subcontractors?

The SC Contractor's Licensing Board sets minimums tied to license type and project value, but most GCs set contract minimums above the state floor: typically $1M per occurrence / $2M aggregate for GL, plus WC/EL at statutory limits. Review your contract requirements and your own carrier's recommendations for each project type.