Blanket Additional Insured

A blanket additional insured endorsement is a single amendment to a liability policy — most often a general liability policy — that grants additional insured status to anyone the named insured is obligated by written contract to cover. Instead of the insurer issuing a new scheduled endorsement (and often charging premium) for each customer, landlord, general contractor, or municipality that demands to be named, the blanket form does it automatically the moment a qualifying contract is signed. Coverage typically attaches only to the extent required by that contract and only for liability arising out of the named insured's ongoing (and sometimes completed) operations, so the third party's protection tracks the actual indemnity bargain the two parties struck.

For a small business this matters because additional insured requirements are a routine gate to getting hired. A subcontractor bidding a job, a tenant signing a commercial lease, or a vendor contracting with a big-box retailer will usually be told to name the other party as an additional insured on a primary and non-contributory basis — see primary and noncontributory. A blanket form lets you satisfy that demand instantly and hand over a compliant certificate the same day, avoiding the delay and per-endorsement fees of scheduling each entity individually. The obligation to add them almost always flows from an insured contract containing a hold-harmless or indemnity clause, which is why underwriters scrutinize the contractual language before relying on the blanket wording.

A critical nuance is what a blanket endorsement is not. It is not the same as blanket insurance, a property concept where one limit floats across multiple locations or categories of covered property — the words "blanket" describe entirely different mechanics on the liability versus property side. It also differs from a plain scheduled additional insured, which names each entity explicitly and covers only those listed. Because a blanket form covers only parties you are contractually required to add, an entity you voluntarily agree to name in a handshake deal, or one added after a loss, may fall outside it. Buyers should also confirm whether the blanket wording extends to completed operations and whether it is truly primary and non-contributory, since a bare grant of additional insured status without those features often fails to satisfy the very contract that triggered it.