What do additional insured, primary & noncontributory, and waiver of subrogation actually mean?

First, what an endorsement even is

An endorsement is a written change to an insurance policy. Think of the policy as the base contract and endorsements as amendments stapled to it — they add coverage, remove it, or change how it works. The three requests in this article are all endorsements to a liability policy, usually the general liability policy of a subcontractor or vendor.

That matters because a COI is not an endorsement. A COI is a one-page summary that says coverage exists on the day it was issued. The standard form, the ACORD 25, says right on it that it confers no rights and doesn't amend the policy. So a certificate that mentions "additional insured" is only as good as the actual endorsement sitting on the policy behind it. If the endorsement isn't there, the words on the certificate don't create it.

Additional insured: their policy covers you too

An additional insured endorsement adds another person or business to someone else's liability policy — not for everything, but typically for claims arising out of the named insured's work or operations for them. Say a GC hires a roofing sub and gets named as an additional insured on the sub's general liability policy. If a claim comes in because of the roofer's work — a passerby hurt by a dropped tool, say — the GC can look to the roofer's policy to respond, instead of only their own.

Why the requesting party wants it: it puts the cost of a claim with the party whose work caused it, and it gives them a direct path to that party's insurer instead of a lawsuit-shaped detour. The exact scope depends on the endorsement's wording — some forms cover only ongoing operations, others also cover completed work — so the words on the endorsement matter more than the label.

• "Named insured" = the policyholder. "Additional insured" = someone added by endorsement, with narrower coverage tied to the named insured's work.
• Many policies use a "blanket" additional insured endorsement, which automatically covers anyone the policyholder agreed in a written contract to cover — no need to add each name one by one.
• Additional insured is not the same as certificate holder. The certificate holder just receives the COI. Being an additional insured requires an endorsement.

Primary and noncontributory: their policy pays first, alone

This one sounds dense but is really two small promises. "Primary" means the sub's policy responds to a covered claim first, before the additional insured's own policy gets involved. "Noncontributory" means the sub's insurer won't turn around and ask the additional insured's insurer to share the cost.

Why it exists: without it, both policies might apply to the same claim, and insurers have "other insurance" clauses that decide who pays what. That can turn into a slow argument between two carriers while the claim sits. Primary and noncontributory wording settles the question in advance: the sub's policy is first in line, and it doesn't get to pass the hat.

Why the requesting party wants it: a GC's own policy has a claims history and often a deductible. If a sub's work causes a loss, the GC would rather that claim live entirely on the sub's policy — first dollar, no contribution — and leave the GC's loss record alone.

Waiver of subrogation: their insurer won't chase you

Subrogation is what happens after an insurer pays a claim: it steps into its insured's shoes and goes after whoever it thinks caused the loss, to get its money back. So if a sub's insurer pays out for a jobsite injury and believes the GC's negligence played a part, it could sue the GC to recover.

A waiver of subrogation endorsement switches that off for a named party. The sub's insurer agrees, up front, that it won't pursue recovery against the GC — commonly only where the sub agreed to the waiver in a written contract before the loss. The claim still gets paid; the insurer just gives up the chase afterward.

Why the requesting party wants it: it keeps the parties on a project from ending up in court with each other through their insurers. The GC pays the sub, the sub's insurer handles the sub's claims, and the loss stops there instead of ricocheting back. Waivers show up on general liability policies and, very commonly, on workers' compensation policies too.

Where the trio shows up on the ACORD 25

Open a standard COI and look at the grid of policies in the middle. Next to each policy row there are two small columns: ADDL INSD and SUBR WVD, each marked Y or N. That's the certificate telling you the producer — the agency that issued the certificate — believes an additional insured endorsement and a waiver of subrogation apply to that policy. Primary and noncontributory doesn't get its own checkbox — when it's noted at all, it appears as text in the Description of Operations box near the bottom, often alongside language like "certificate holder is an additional insured where required by written contract."

Here's the catch worth repeating: those checkboxes and that text are statements about the policy, not the policy itself. A checked box with no endorsement behind it protects no one. If an endorsement genuinely matters to you — and on a big job it usually does — ask for a copy of the endorsement pages themselves, or confirm directly with the issuing agent. (CompliCloud can send that confirmation for you, straight from the stored certificate.)

There's a fuller walkthrough of the form in our ACORD 25 guide, including what every box means.

You've been asked for all three. Now what?

Don't panic, and don't sign yet. This trio is a normal, routine request in construction and property management contracts — it's how bigger parties standardize risk down the chain, and being asked for it usually just means you're working with an organized client.

Call your insurance agent and read them the contract's insurance section word for word. Ask three things: does my policy already have blanket endorsements that satisfy this, is there any charge to add what's missing, and can you issue the COI showing it. Many policies already include blanket additional insured and waiver endorsements; where something has to be added, there may be a small premium charge — it varies by carrier and policy, so let your agent quote it rather than guessing.

One honest caution: these endorsements shift real risk onto your policy. That's the point of them, and it's usually an acceptable cost of getting the work. But if a contract's insurance demands feel far out of scale with the job, that's a fair thing to raise with the client or run past your agent before you sign. Requirements vary by state, client, and contract — your agent and the contract itself are the authorities, not a checklist.

Common questions

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