A guide for general contractors on protecting your business through contractual risk transfer
As a general contractor, you hire subcontractors to get the job done. But when something goes wrong on a jobsite — an injury, property damage, or a completed-project defect discovered years later — the question isn’t just what happened. It’s who pays.
The answer lives in your subcontractor agreement.
Most GCs think of insurance as a policy they buy. In reality, your subcontractor agreement is just as important as any policy in your portfolio. A well-crafted agreement defines how risk is transferred, who is protected, and whether your insurance program actually works the way you expect it to when a claim arises.
The Problem With “Just Get a COI”
Many general contractors require a Certificate of Insurance (COI) from their subs and consider the job done. But a COI is not a guarantee of coverage — it’s a snapshot. It confirms a policy existed at the time it was issued. It does not confirm:
- That your company is properly listed as an Additional Insured
- That the correct endorsements are attached to the policy
- That coverage will respond to your specific loss scenario
- That the sub’s policy hasn’t been cancelled since the certificate was printed
Without a contractual requirement spelled out in a Master Subcontractor Services Agreement (MSA), a COI gives you a false sense of security.
What a Strong Subcontractor Agreement Actually Requires
A comprehensive subcontractor agreement should go far beyond “carry insurance.” Here’s what the most protective agreements include:
1. Commercial General Liability with Per-Project Aggregates
Minimum limits of $1M per occurrence / $2M general aggregate are standard — but the aggregate limit is where most GCs get burned. A single sub’s policy aggregate can be eroded by claims on other projects before yours is even complete.
Require a per-project aggregate endorsement (ISO Form CG 25 03 or CG 25 04), which dedicates a separate $2M aggregate to each project. This ensures your project is fully protected regardless of what else that sub has going on.
2. Additional Insured Endorsements — The Right Ones
Not all Additional Insured endorsements are created equal. Your agreement should require the specific ISO forms by number:
- CG 20 10 — Additional Insured: Owners, Lessees or Contractors (Ongoing Operations)
- CG 20 37 — Additional Insured: Owners, Lessees or Contractors (Completed Operations)
CG 20 37 is critical. It extends your Additional Insured status to cover claims arising after the project is finished — including latent defects that may not surface for months or years. Generic “Additional Insured” language without these specific endorsements may leave you unprotected on completed-operations claims.
3. Completed Operations Tail Coverage
Require subcontractors to maintain completed operations coverage for a minimum of three years post-project completion. Construction defect claims — water intrusion, structural issues, faulty workmanship — routinely emerge long after a project closes out. Without a contractual tail requirement, a sub can let their policy lapse the day the job is done, leaving you exposed.
Reinforce this with a contractual indemnity provision that survives policy cancellation, and require annual COI re-submission so you can verify coverage remains in force.
4. Workers’ Compensation with Elevated Employers’ Liability Limits
Statutory Workers’ Compensation is the minimum — but Employers’ Liability limits of $100K/$100K/$500K are dangerously low for construction. Require elevated limits in the range of $500K to $1M per occurrence depending on your carrier’s preference and project exposure.
This protects both the subcontractor’s employees and limits your own exposure if an injured worker pursues a claim that bleeds over into your GL policy through a wrap-around or third-party liability theory.
5. Commercial Auto at $1M CSL
All vehicles used in connection with your project — owned, non-owned, and hired — should be covered at a minimum of $1M Combined Single Limit (CSL). A sub’s pickup truck or delivery vehicle involved in an accident on the way to your jobsite is a direct liability exposure for your project.
6. Commercial Umbrella / Excess Liability
A $1M umbrella over the sub’s primary layers provides an important buffer. For larger projects or higher-exposure trades, consider requiring higher umbrella limits commensurate with the scope of work.
7. Waiver of Subrogation
Require a blanket waiver of subrogation on all policies — GL, auto, and workers’ comp. Without it, a sub’s insurer who pays a claim can turn around and sue you to recover what they paid. A waiver of subrogation contractually eliminates that risk.
8. Hold Harmless and Indemnification Language
Broad-form contractual indemnity provisions shift liability for the sub’s work back to the sub, even when your company is partially at fault (subject to applicable state law). Work with legal counsel to ensure your hold harmless language is enforceable in your state and aligns with your GL policy’s contractual liability coverage.
The Backstop: Your Own Policy as Defense in Depth
Even with a perfect subcontractor agreement, gaps can occur. A sub goes out of business. A policy lapses. An insurer disputes coverage. That’s why the best GC insurance programs include:
- Completed operations coverage on your own GL policy as a backstop for sub-related claims
- Contractual indemnity provisions that survive beyond policy cancellation
- Annual COI re-submission requirements built into your MSA to keep sub coverage verified year-round
Put It All in Writing — Before Work Begins
The biggest mistake GCs make is letting a sub start work before the paperwork is signed and insurance verified. Your agreement should require:
- Executed MSA before mobilization
- Certificate of Insurance naming your company as Additional Insured, with all required endorsements
- Actual endorsement copies (not just certificate language) confirming the ISO form numbers are attached
Verbal commitments and last-minute certificates don’t protect you. The contract does.
Bottom Line
Your subcontractor agreement isn’t just a legal formality — it’s the foundation of your entire risk management program on every project you build. A well-structured agreement with precise insurance requirements, the right endorsements cited by ISO form number, and strong contractual language can mean the difference between a covered claim and a six-figure out-of-pocket loss.
If you haven’t reviewed your subcontractor agreement with your insurance advisor recently, now is the time. The cost of getting it right is far less than the cost of finding out it was wrong.
Have questions about your subcontractor insurance requirements? Contact Pillar Insurance at (417) 633-7577 or reach us at jtrussell@pillar-insurance.com. We specialize in construction risk and can review your MSA to ensure your program is built to protect you.