Guide
What Additional Insured Means for Your Business
By Keelstar Team · Updated June 1, 2026
The short answer
Additional insured status extends certain coverages from your vendor's policy to you — typically general liability — so their insurer may defend and indemnify you for claims arising from the vendor's work. It is not blanket protection: scope depends on the endorsement, your contract, and who caused the loss. Always confirm the endorsement matches your agreement, not just a checkbox on the ACORD 25.
The plain-English definition
When you are named as an additional insured on a vendor's liability policy, you share in that policy's protection for certain claims — usually those connected to the vendor's work for you. If a visitor slips on a wet floor after your cleaning contractor mopped, or a subcontractor's work damages a tenant unit, their insurer may cover your organization alongside the vendor — subject to policy terms.
Why U.S. contracts require it
Property owners, general contractors, and healthcare systems require additional insured status because vendors create third-party liability on your premises and under your brand. Without it, your own policies absorb defense costs and settlements that the vendor's carrier might otherwise pay. Lenders, landlords, and upstream owners often mandate it in lease and subcontract flow-downs.
What the endorsement actually covers
Coverage scope lives in the endorsement — not the certificate checkbox. Common ISO forms cover liability arising out of your ongoing operations or completed operations performed for you. 'Your work' endorsements in construction tie coverage to the project. Primary and non-contributory wording affects whether the vendor's policy pays before yours. Read the endorsement or have risk management review it for high-exposure relationships.
Additional insured vs certificate holder
Certificate holder means you received the ACORD 25 — informational only. Additional insured means you may have rights under the policy. Teams confuse these constantly. A certificate listing you as certificate holder without a valid additional insured endorsement does not meet typical U.S. construction or property management requirements.
Healthcare and facilities context
Hospitals and clinic operators often require additional insured status from medical waste haulers, biomedical equipment servicers, and facility contractors who work near patients. The goal is to align vendor liability with incidents on campus — not to replace the organization's own medical professional liability program.
How to verify compliance
Compare the contract's insurance exhibit to the certificate remarks and the actual endorsement PDF. Confirm your legal name, the correct policy (usually general liability), and project or location language where required. Store the endorsement with the certificate so auditors and claims counsel can access it without chasing the broker.
Frequently asked questions
- Does additional insured make us immune from lawsuits?
- No. It gives you access to the vendor's liability coverage for qualifying claims — often with defense costs — but exclusions, limits, and fault still apply.
- Why do certificates and contracts disagree on additional insured?
- Brokers sometimes issue certificates with generic language before endorsements are processed. Request the endorsement form when the contract requires specific ISO wording.
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