Additional Insured (AI) endorsements can either grant direct liability coverage to a contract partner for a specific project, cover vicarious liability for the AI's workmanship or products, or—depending on the wording—do both.
AI endorsements are widely misunderstood for several reasons: court interpretations are relatively recent and vary by state; policy language changed when comprehensive policies moved to commercial forms; and by the time a dispute reaches litigation the same endorsement wording may already have been interpreted multiple times.
Who Is an Insured (Section II) is commonly amended to include the person or organization shown in the Schedule, but only with respect to liability arising out of your ongoing operations performed for that insured. How courts read phrases like "arising out of" and "ongoing operations" drives outcomes more than labels such as "additional insured."
Common wording variants
- “Arising out of” operations for that insured (the AI)
- “Ongoing operations” — yours on behalf of the AI
- “Work” — yours on behalf of the AI (older forms)
- Various manuscript or industry-specific endorsements
The phrase "arising out of" is typically interpreted broadly by courts and does not limit coverage to only negligence-based acts or omissions; a factual connection between your operations and the loss can be enough to trigger coverage.
On ISO forms, "work" and "ongoing operations" are often treated as synonymous, with courts focusing on any process connection between your operations and the claimant's damages. Manuscript forms can differ, so reading the precise endorsement language is essential; industry-specific examples such as Additional Insured Endorsements and Window Tinting show how variations arise in practice.
Because construction and service processes typically involve overlapping responsibilities, both the named insured and the AI may be held liable for the same incident even if apparent negligence lies mainly with one party.
Keep this broad interpretation in mind when accepting AI status. Read the endorsement carefully and, where helpful, consult practical guidance such as Understanding Additional Insureds in Contractor Insurance Policies so you know the likely scope of protection before agreeing to contract language.
If the endorsement language is unclear or you want to limit exposure, discuss the contract and endorsement with coverage counsel or talk to an agent.
Frequently Asked Questions
What does “additional insured” actually mean for my business?
It means the named additional party can be covered under your liability policy for claims connected to your operations as specified by the endorsement language.
Does “arising out of” require proof of negligence?
No; many courts interpret "arising out of" broadly so that a causal connection between your work and the loss may be enough.
Are manuscript endorsements different from ISO forms?
Yes; manuscript or industry-specific endorsements can alter scope and should be reviewed carefully because they may limit or expand coverage compared to standard ISO wording.
Can I limit my obligation when a contract requires me to add another party as an AI?
You can negotiate endorsement language and seek narrower wording or additional insured-only-for-liability provisions, but changes require insurer approval.