What is a blanket additional insured endorsement?
A blanket additional insured endorsement automatically extends additional insured status to parties the named insured agreed in writing to cover. Instead of issuing a scheduled endorsement for every client, landlord or general contractor, one policy form can respond to many qualifying contracts.
Blanket does not mean universal. The endorsement's conditions still decide who qualifies, when status begins, which operations are covered and whether completed operations are included.
The written-contract trigger
Most blanket endorsements require a written contract or agreement that obligates the named insured to add the other party. If the agreement was unsigned, executed after work began, or uses vague insurance language, the automatic status may not attach. Keep the contract with the certificate and endorsement evidence.
Ongoing and completed operations remain separate
A blanket ongoing-operations endorsement does not necessarily protect the additional insured after the contractor finishes work. Construction agreements often require both ongoing and completed-operations coverage, whether delivered through blanket carrier forms or scheduled ISO forms such as CG 20 10 and CG 20 37.
How to verify blanket additional insured status
- Obtain the actual blanket endorsement, not only the ADDL INSD checkbox.
- Confirm the policy number and effective dates match the certificate.
- Read the definition of parties granted status and the written-contract condition.
- Confirm the contract was executed on time and names the correct entities.
- Check whether ongoing and completed operations are both covered when required.
- Verify primary/non-contributory wording separately.
Blanket versus scheduled endorsement
A scheduled endorsement names the protected party directly and is easier to match to one project. A blanket endorsement is operationally efficient but pushes more of the verification onto the contract and form wording. Neither is automatically better; the requirement is that the mechanism actually grants the protection the contract demands.
Frequently asked questions
Does a blanket additional insured endorsement name me?
Usually not. Your status arises because you fit the endorsement's class of parties and have a qualifying written contract with the named insured.
Is a blanket endorsement enough for completed operations?
Only if its wording expressly grants completed-operations coverage. Many forms cover ongoing operations only, so verify completed operations separately.
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