· Updated August 9, 2026

Subcontractor Insurance Requirements Checklist | COI File

Every general contractor needs a subcontractor insurance requirements checklist. Learn which coverages, limits, and endorsements to verify before any sub mobilizes on your project.

Before any subcontractor steps onto your jobsite, you need five things verified on their certificate of insurance: general liability at $1M per occurrence and $2M aggregate minimum, workers compensation at statutory limits, commercial auto if they drive on site, umbrella coverage bringing combined limits to $5M or more on larger projects, and three specific endorsements naming your company as additional insured with waiver of subrogation and primary non-contributory language. Skip any of these and the sub causes damage or injury, you pay the claim, not them.

This checklist walks through each requirement, explains why it matters, and flags the gaps that catch general contractors off guard. Use it for every subcontractor before they mobilize.

What Insurance Coverage Types Must Subcontractors Carry?

A subcontractor COI is not a one-line document. It should list multiple coverage types, each with its own limits and policy numbers.

General Liability (CGL)

This is the foundation. It covers third-party bodily injury and property damage caused by the subcontractor work. The baseline in 2026 is $1,000,000 per occurrence and $2,000,000 aggregate. Do not accept $1M aggregate on a $1M per occurrence policy. That means one claim exhausts the entire policy for the year and subsequent claims have no coverage.

For high-risk trades like roofing, structural steel, excavation, and demolition, push general liability to $2M per occurrence and $4M aggregate, with umbrella coverage on top. The WTW 2025 Construction Marketplace report notes that higher-hazard project types face ongoing rate pressure, so expect subs in these trades to push back on cost. A single roofing claim can exceed $1M. If a sub cannot carry the required limits, do not accept the bid.

Workers Compensation

Statutory limits in the state where the work is performed. If a subcontractor claims they do not need workers comp because they are a sole proprietor, verify with your state board. Many states require it regardless. A sub worker injured on your site without workers comp coverage becomes your liability. GCs have been hit with six-figure judgments when uninsured sub workers were injured and sued up the chain.

Commercial Auto

$1,000,000 combined single limit minimum. This covers vehicles entering and leaving your site. If the sub uses personal vehicles for business, their personal auto policy likely excludes business use. This is one of the most frequently overlooked gaps in sub requirements, so ask whether they use personal or business vehicles.

Umbrella / Excess Liability

On projects valued over $500,000 or involving high-risk trades, require umbrella coverage bringing total combined limits to $5,000,000 or more. WTW data shows umbrella rates trending flat to +15 percent in 2025, so budget-conscious subs may try to skip this. The umbrella must follow form to the underlying general liability and auto policies, meaning it covers the same things but with higher limits. The additional insured endorsement must also extend to the umbrella. A surprising number of umbrellas do not automatically include additional insureds from the underlying policy.

Professional Liability / E&O

Required for design-build subs, engineers, architects, and any sub providing professional advice or stamped drawings. General liability excludes professional services. Without E&O, a design error that causes a construction defect lands entirely on you. Require $1M minimum, with higher limits for subs doing structural or geotechnical design.

Pollution Liability

Required for subs handling fuel, chemicals, solvents, or hazardous materials. Standard general liability excludes pollution. A fuel spill from a sub excavator that contaminates soil is a six-figure cleanup with no coverage if pollution liability is not in place. This one is easy to forget because it is not on the standard ACORD 25 checklist, but for demo crews, fuel suppliers, and environmental contractors, it belongs in your requirements.

What Endorsements Are Non-Negotiable on Every Sub COI?

Coverage types and limits are the what. Endorsements are the who is protected and how. These three endorsements separate a compliant COI from a dangerous one.

Additional Insured: CG 20 10 and CG 20 37

Being named as additional insured is the single most important requirement in your sub insurance spec. It means the sub general liability policy covers you for claims arising from the sub work. Without it, the sub policy protects only the sub.

You need two forms. CG 20 10 covers you during ongoing operations. CG 20 37 extends that coverage to completed operations, the period after the sub finishes work when construction defect claims typically surface. Accepting only CG 20 10 is a common and expensive mistake. A wall built by a sub that collapses two years later is a completed operations claim. Without CG 20 37, you have no coverage for it.

The additional insured box checked on the COI is not enough. The endorsement must be attached to the actual policy. The COI itself says so: it "confers no rights upon the certificate holder." Ask for a copy of the endorsement if the project value or risk warrants it.

Waiver of Subrogation

This waiver prevents the sub insurer from paying a claim to the sub, then turning around and suing you to recover that payout. Without it, the sub insurer can pay for damage the sub caused, then pursue you in subrogation, claiming your supervision or site conditions contributed. You end up in litigation against your own sub insurance carrier. Waiver of subrogation shuts that door. Require it on general liability, auto, and workers compensation policies.

Primary and Non-Contributory

This language ensures the sub insurance pays first, before your own policy is touched. Without it, in the event of a claim, your insurer and the sub insurer may split the cost proportionally, which means your policy limit is eroded by a claim you did not cause. The clause must reference your company by name and apply to the specific project. Generic "primary and non-contributory" wording without naming your entity is ambiguous and can be challenged.

The Pre-Mobilization Subcontractor Insurance Checklist

Use this checklist for every subcontractor before they begin work. No exceptions. The average claim cost when a subcontractor policy has lapsed is $284,000, based on Zurich Construction Risk Engineering data. That is the cost of skipping this list.

  1. Named insured matches subcontract legal name exactly.

    "ABC Construction" and "ABC Construction LLC" are not the same entity. A DBA alone is insufficient. Verify against the subcontract and the state business registry.

  2. General liability: $1M per occurrence / $2M aggregate minimum.

    Check both numbers. $1M/$1M is a red flag. High-risk trades like roofing and structural require $2M/$4M.

  3. Workers compensation at statutory limits, state where work is performed.

    Confirm the policy covers the specific state. A Florida workers comp policy does not cover work performed in Georgia.

  4. Commercial auto $1M combined single limit if vehicles enter site.

    Ask whether the sub uses personal or business vehicles. Personal auto policies exclude business use almost universally.

  5. Umbrella/excess liability bringing combined limits to project requirement.

    Confirm the umbrella follows form to underlying GL and auto. Confirm additional insured status extends to the umbrella.

  6. Policy effective date is on or before mobilization date.

    A future effective date means coverage has not started. Do not let the sub begin work until the policy is active.

  7. Policy expiration date extends beyond project completion plus warranty period.

    A policy expiring mid-project is a ticking clock. Require annual renewals submitted 30 days before expiration.

  8. Your company named as additional insured with CG 20 10 and CG 20 37 endorsements.

    Your legal entity name must appear exactly. "Jones GC" and "Jones General Contractors Inc." are different entities to an adjuster.

  9. Waiver of subrogation in favor of your company on GL, auto, and WC.

    Verify the waiver references your entity by name. A generic waiver without naming you may not be enforceable.

  10. Primary and non-contributory language naming your company.

    Look for this in the Description of Operations section. It must name your entity and reference the specific project or contract.

  11. Carrier A.M. Best rating A- VII or higher.

    Lower-rated carriers may lack the financial reserves to pay large claims. Check rating at ambest.com before accepting the certificate.

  12. Carrier licensed/admitted in the project state.

    Verify through your state Department of Insurance website. Surplus lines carriers must be eligible through the state stamping office.

  13. Professional liability / E&O if sub provides design or engineering.

    General liability excludes professional services. If the sub stamps drawings or provides design input, E&O is required.

  14. Pollution liability if sub handles hazardous materials, fuel, or chemicals.

    Standard GL excludes pollution claims. A single fuel spill cleanup can exceed $100K.

  15. Agent contact information verified independently.

    Do not use the phone number on the COI for verification. Look up the agency independently online. Call and confirm the policy is active, limits match, and your entity is listed as additional insured.

  16. Document everything.

    Date of verification, who performed it, any discrepancies found and how they were resolved. In a claim or audit, you need to prove you verified, not just collected.

The Gaps That Catch General Contractors Off Guard

The subcontractor-work exclusion is the gap that sinks more GC claims than any other, according to Prime Risk Insurance construction coverage data. Many general liability policies limit or remove completed-operations coverage for damage arising from subcontractor work. If your own GL has this exclusion and your sub is uninsured or underinsured, you carry the full loss without any fallback coverage. Review your own policy with your broker and confirm the subcontractor exception is present in the "Your Work" exclusion.

Another gap that surfaces repeatedly: the sub COI looks perfect at project start, but eight percent of subcontractor policies are cancelled mid-term, per ISNetworld data. The certificate in your file still shows active coverage while the underlying policy is gone and the sub keeps working. Regular re-verification every 90 days on active projects catches these mid-term lapses before they become claim problems.

Small contractors are particularly vulnerable to coverage gaps tied to subcontractors, according to Tivly insurance gap analysis published in May 2026. They are more likely to rely on outdated COIs, accept lower limits from smaller subs, and skip verification entirely because they lack dedicated compliance staff. The solution is not necessarily more staff. It is a disciplined checklist applied consistently, or automated COI tracking that flags non-compliance before the sub mobilizes.

How to Verify a Subcontractor COI in Under 10 Minutes

If you are collecting COIs manually, the process takes discipline but it does not need to take hours.

  1. Lay the COI next to your subcontract. Compare the named insured, coverage types, limits, and additional insured entity name. Two minutes.
  2. Check all 16 points on the checklist above. Mark each pass or fail. Four minutes.
  3. Flag discrepancies. Any mismatch goes on a punch list for the sub to resolve. One minute.
  4. Call the agent for high-risk or high-value subs. Use an independently sourced phone number. Ask: "Is policy [number] active? Are limits [X]? Is [your entity] listed as additional insured with waiver of subrogation?" Two minutes. Most agents can confirm in under 120 seconds.
  5. Log the verification. Date, verifier name, result, and any follow-up items. One minute.

For GCs managing multiple projects with 30-plus active subcontractors, manual verification at this pace is still 5 to 7 hours per week, on top of the actual project management work. This is where COI tracking software changes the equation. AI extraction reads the COI, pulls every field, compares it against your contract requirements, and flags non-compliant certificates automatically. Manual verification drops from 10 minutes per COI to reviewing only the exceptions.

COI File handles verification, expiration tracking, and automated renewal requests. It is 7-day free trial on all plans. Start free today. 7-day free trial • Cancel anytime.

Frequently Asked Questions

At minimum, require general liability at $1M per occurrence and $2M aggregate, workers compensation at statutory limits, and commercial auto at $1M. For large commercial projects, add umbrella/excess liability bringing total limits to $5M or more. High-risk trades like roofing, demolition, and structural work should carry higher limits and pollution liability where applicable. Every sub must name the GC as additional insured on both ongoing and completed operations, provide a waiver of subrogation, and include primary and non-contributory language. Without all three of these endorsements, the sub policy protects the sub but not you.
$1,000,000 per occurrence and $2,000,000 aggregate is the industry baseline for commercial and public projects in 2026. That said, $1M per occurrence with only $1M aggregate is effectively half the coverage because the aggregate caps total claims across the policy year. Most GCs now require $2M aggregate minimum. On federal projects, infrastructure work, and large commercial jobs, total combined limits of $5,000,000 or more through umbrella coverage are standard, according to Vertikal RMS 2025 vendor insurance requirements data.
No. A COI is issued for informational purposes only. It does not confer rights, does not amend the policy, and does not guarantee coverage exists. The ACORD 25 form states this explicitly at the top of every certificate. If a sub cancels their policy the week after sending you a COI, the paper in your file offers zero protection. You need the actual endorsements attached to the underlying policy: additional insured status on a CG 20 10 or CG 20 37, waiver of subrogation, and primary/non-contributory language. The COI is evidence. The endorsements are the protection.
Three endorsements are non-negotiable. First, additional insured status on ISO form CG 20 10 for ongoing operations plus CG 20 37 for completed operations. Without CG 20 37, you lose coverage the moment the sub finishes work, which is precisely when construction defect claims surface. Second, a waiver of subrogation prevents the sub insurer from paying a claim to the sub and then suing you to recover that money. Third, primary and non-contributory language ensures the sub policy pays first before your own insurance is touched. Accepting a COI that is missing any of these three is like accepting half a contract.
Check the carrier A.M. Best rating. Most GCs require A- VII or better, which indicates both financial strength and size. Verify the carrier is licensed in your state through your state Department of Insurance website, every state maintains a searchable database. For surplus lines carriers, check eligibility through your state surplus lines stamping office. If the carrier has no A.M. Best rating, is not licensed in your state, or the agent contact information on the COI does not match independent online searches, call the agent directly using a phone number you find yourself, not the one printed on the certificate.
At every renewal date, which is typically annual, and at minimum every 90 days on long-running projects. About 8 percent of subcontractor policies are cancelled mid-term for non-payment or other reasons, according to ISNetworld data. The COI in your file still shows active coverage. The underlying policy is gone. A quarterly verification check against the carrier catches mid-term lapses that expiration-date tracking misses. For projects exceeding 12 months, build re-verification into the project schedule at each billing cycle.
The subcontractor-work exclusion in the GC own general liability policy is the single most damaging gap. Many GL policies limit or eliminate completed-operations coverage for damage arising from sub work. If your policy has this exclusion and your sub is uninsured or underinsured, you carry the full loss. Other common gaps: accepting CG 20 10 additional insured without CG 20 37 completed operations coverage, not requiring pollution liability for trades handling chemicals or fuels, not verifying auto liability for subs who drive on site, and accepting umbrella coverage that does not follow form to the underlying policy for additional insured status.

Sources and References

  • Zurich Construction Risk Engineering - Average claim cost of $284,000 when subcontractor insurance lapses. Data cited across multiple industry analyses.
  • ISNetworld - Approximately 8% of subcontractor insurance policies cancelled mid-term for non-payment or other reasons.
  • Buildings.com / BCS Research - Up to 90% of COIs are incorrect on first submission to property managers and GCs.
  • WTW Insurance Marketplace Realities 2025 - Construction - Rate trends for general liability, umbrella, and subcontractor default insurance.
  • Vertikal RMS Vendor Insurance Requirements Guide 2026 - Industry-standard limits by project type and trade.
  • Prime Risk Insurance - General Contractor Coverage Gaps Guide - Subcontractor-work exclusion as the most damaging gap for GCs.
  • Grit Insurance - Subcontractor Insurance Requirements for GCs - Baseline limits and endorsement requirements for 2026 commercial projects.
  • Tivly - Insurance Gaps Continue to Expose Small Construction Contractors (May 2026) - Coverage gap patterns among small to mid-size GCs.
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Firdaosh Bano

COI Compliance Specialist

Firdaosh Bano is a COI compliance specialist and the founder of COI File. She spent 6 years managing vendor compliance for commercial properties - tracking 2,000+ COIs across 150+ properties in spreadsheets before building the tool she wished she'd had. She writes about certificate of insurance compliance, vendor risk management, and making insurance tracking less painful for small teams.

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