Certificate holder vs additional insured comes down to this: the certificate holder gets proof that the contractor is insured, and the additional insured is actually covered by that insurance. As the certificate holder, you receive a certificate of insurance showing what the contractor carries. As an additional insured, you're covered under the contractor's own liability policy for claims tied to their work, but only if an endorsement on the policy says so.
The trouble usually starts when a certificate arrives with a "Y" in the additional insured column and everyone assumes the job is done. Often nobody looks again until there's a claim. We wrote this for whoever collects certificates from subcontractors, and for the owner who signs the contracts that require them.
Insurance is regulated state by state, and policy wording varies by insurer and form edition. For what a specific policy or contract means, ask your insurance broker or your lawyer.
What is a certificate of insurance holder?
The certificate holder is the person or company a certificate of insurance is issued to. On a COI from your subcontractor, that's your company, named in the Certificate Holder box at the bottom of the form. For the basics of the form itself, see What Is a Certificate of Insurance?
Being the certificate holder gets you a document. It doesn't give you any rights under the policy: you can't file a claim under it, and you can't change it. Georgia's insurance department says in Bulletin 23-EX-9, an FAQ it describes as guidance rather than law, that the Certificate Holder box can't be used to "imply or confer any new or additional rights" beyond what the policy or an executed endorsement provides.
So why ask to be the certificate holder at all? It gets you proof, addressed to you, that the contractor had insurance on the day the certificate was issued. For a low-risk vendor that may be all you need. For a sub working on your job site, it usually isn't.
What an additional insured gets
An additional insured is a person or company added to someone else's policy as an insured. When a sub's general liability policy names your company, that policy treats you as an insured for claims arising from the sub's work, within the limits the endorsement sets.
Say someone is hurt on your site because of the sub's work and sues you. As an additional insured, you can send the claim to the sub's insurer and ask it to defend you. Without that status, the claim lands on your own policy, and the most you have is whatever the indemnity clause in your subcontract is worth.
There are two catches. The endorsement is narrower than the contractor's own coverage: it usually covers you only for liability connected to the contractor's work, and not for everything that happens on your site. It can also cost the contractor money. The Connecticut Insurance Department notes in Bulletin S-14 that "in some cases, there may be a cost" for this protection, which is one more reason to write it into the contract and the bid instead of asking for it by email at the last minute.
Certificate holder vs additional insured, side by side
| Question | Certificate holder | Additional insured |
|---|---|---|
| What you get | A certificate addressed to you, showing coverage on the day it was issued | Coverage under the contractor's policy, as the endorsement describes it |
| Where it comes from | The contractor's agent fills in your name on the certificate | The insurer adds you through an endorsement, or the policy's own terms cover you |
| Can you make a claim? | No | Yes, for claims the endorsement covers |
| Notice if the policy is cancelled | Only if the policy or an endorsement requires it | Only if the policy or an endorsement requires it |
| Cost to the contractor | Usually none | Sometimes an added premium |
| Proof you should keep | The certificate | The certificate plus the endorsement page |
You can be both at once, and on a construction job you usually want to be. The certificate tells you the coverage exists, and the endorsement is what puts you under it.
How the additional insured endorsement creates your status
Only the policy can make you an additional insured, either through an endorsement that names you or through blanket wording that covers anyone the contractor agreed in writing to add.
A scheduled endorsement that names you
A scheduled endorsement lists your company by name on a page that's part of the policy. That's about as clear as proof gets. Many insurers use standard forms from ISO (Insurance Services Office), and on construction work two come up most often:
- CG 20 10, "Additional Insured – Owners, Lessees or Contractors – Scheduled Person or Organization." Insurance Journal calls it the most common additional insured endorsement for contractors. Editions after the November 1985 version cover you only for ongoing operations, meaning while the work is being done.
- CG 20 37, "Additional Insured – Owners, Lessees or Contractors – Completed Operations." This one covers claims that come up after the work is finished, like a leak from plumbing installed months earlier.
If your contract asks for coverage during and after the work, you usually need both, or the insurer's own equivalents. Edition dates matter too, because the wording has changed over the years. Your broker can tell you which to ask for.
Blanket additional insured endorsement
A blanket (or automatic) additional insured endorsement doesn't list names. It covers anyone a written contract requires the contractor to add, so the agent doesn't have to request a new endorsement for every job. Insurance Journal describes two ISO versions: CG 20 33, for parties the contractor has a written construction agreement with, and CG 20 38, which also reaches other parties that agreement requires the contractor to add. Many insurers write their own blanket forms instead.
Blanket wording only helps you if you fit its conditions. When you read the form, check these:
- Is there a written contract? Most blanket forms cover only parties the contractor agreed in writing to add. A handshake, or a purchase order with no insurance clause, may not count, so get a signed subcontract that requires the status before work starts.
- Who signed with whom? Some blanket forms cover only parties that have a direct contract with the contractor. Insurance Journal walks through an example where the owner is left out because it signed only with the general contractor, not with the subs. If your client has to be covered on your subs' policies too, those forms need wording that reaches up the chain, like CG 20 38.
- Does it cover completed work, or only ongoing operations?
How to show additional insured on a COI, and what it can't say
Our certificate of insurance sample walks through the ACORD 25's ADDL INSD column and description box. Georgia's bulletin tells agents to mark that box only when an endorsement names the certificate holder as additional insured. Wherever you are, that "Y" is the agent telling you what the policy says. It isn't the endorsement.
Blanket coverage is where people on the receiving end get tripped up. Suppose the sub's policy has a blanket endorsement, and you ask the agent to name your company as additional insured on the certificate. In some states the agent isn't allowed to:
- Georgia says a certificate may not name the holder as additional insured when the policy has only a blanket endorsement, though it may state that the policy contains one. The same goes for a blanket waiver of subrogation. Certificates also can't refer to a contract's insurance requirements: a contract number for identification is fine, "coverage per contract #118" isn't.
- New York law says no one may willfully require a certificate to include terms the policy doesn't expressly include (Insurance Law §502). In December 2015 a Department of Financial Services attorney told Big I New York that agents may not list specific additional insureds on a certificate when coverage comes from a blanket endorsement, and that no one may require them to, as Big I New York reported.
So a certificate that says "blanket additional insured where required by written contract" may be the most a correct certificate in your state can say. Pushing the agent to reword it won't change the policy, and it can backfire. Georgia's bulletin lists penalties of up to $5,000 per violation, and they can apply to certificate holders who require false or misleading certificates as well as to agents. Ask for the endorsement instead.
What to ask for when you need to be an additional insured
Use this list whether you're the one sending the request or the one deciding what the contract requires. Asking for the actual pages is normal: Georgia's bulletin confirms that nothing in its law stops an agent or insurer from giving you copies of the policy or its endorsements.
- The certificate, made out to your exact legal name. With a scheduled endorsement, the ADDL INSD box should be marked on the general liability row (and on auto or umbrella if your contract requires it there). With a blanket one, depending on your state, the certificate may only say the policy has one.
- The additional insured endorsement page itself. For a scheduled endorsement, check that your company is named. For a blanket one, read who it covers and keep a copy next to the signed contract.
- Completed operations coverage, if your contract requires it: a CG 20 37, an equivalent, or blanket wording that covers completed work.
- The waiver of subrogation endorsement, if the contract requires one.
- The form numbers and edition dates, so your broker can check them.
- The renewed endorsement each policy period. An endorsement belongs to one policy, so ask for the new one along with each renewed certificate.
A short email is usually enough:
Hi Dana, thanks for the certificate for Brindle Creek Drywall. Our subcontract requires Ashford Lane Builders Inc. to be an additional insured on the general liability policy for ongoing and completed operations, with a waiver of subrogation on GL and workers' comp. Could you send the additional insured and waiver of subrogation endorsements that apply, with their form numbers? Blanket pages are fine. Thanks!
If the endorsement doesn't match the contract, take it up with the contractor and whoever signed your contract, ideally with your broker in the loop. Getting the certificate reworded won't fix it. If the contract language itself is the question, ask your lawyer.
Waiver of subrogation, briefly
Subrogation is an insurer's right, after paying a claim, to recover the money from whoever caused the loss. A waiver of subrogation is an endorsement in which the contractor's insurer gives up that right against you. Next Insurance explains that it has to be added before a loss happens, and that it may raise the contractor's premium.
Take a case where the sub's workers' comp insurer pays for an employee's injury on your site. Without a waiver, it could try to recover that money from your company if it believes you contributed. With a waiver in your favor, it can't.
Like additional insured status, a waiver can name you or be blanket. And the SUBR WVD box on the certificate is, again, just the agent's statement. What you want on file is the endorsement.
Keep the endorsement and the dates together
An endorsement is only good while its policy is in force. When the sub's policy renews, you need a new certificate and the new endorsement. Otherwise you end up holding a current certificate next to last year's endorsement, and that mismatch is easy to miss.
File both under the sub, with the expiration date written down. ExpirationPilot tracks each certificate's expiration date and emails the person responsible 30, 14 and 7 days before by default. It can also email the contractor an upload link and follow up once a week, up to six times, until the renewed documents arrive. It doesn't read endorsements or check their wording, so someone on your team still has to compare each file with the contract.
Quick answers
Is a certificate holder the same as an additional insured?
No. A certificate holder receives proof of insurance. An additional insured is covered under the policy. You can be both, but being the certificate holder never makes you an additional insured on its own.
The certificate says "blanket additional insured." Is that enough?
It tells you the policy has a blanket endorsement. Whether that endorsement covers you depends on its wording and on whether your signed contract requires the status. Ask for the endorsement page and keep it with the contract.