This is the most expensive misunderstanding in vendor compliance. A property manager sees their company name printed on a certificate, assumes they are protected, and finds out during a claim that they were only on the mailing list.
Side by side
| Certificate holder | Additional insured | |
|---|---|---|
| What it is | The recipient of the certificate document | A party added to the policy itself |
| Created by | Typing a name into a box on the ACORD 25 | An endorsement form attached to the policy |
| Coverage granted | None | Defense and indemnity for claims arising out of the named insured's work |
| Right to notice | Only what the policy provisions actually require | Depends on the endorsement and policy wording |
| Proof to demand | The certificate | The endorsement form itself (CG 20 10, CG 20 37 or equivalent) |
| Cost to the vendor | Nothing | Often a small premium charge, which is why it gets skipped |
Why the checkbox is not enough
The ACORD 25 has an "ADDL INSD" column with a checkbox per coverage line, and a Description of Operations box where an agency will often type wording like "Certificate holder is named as additional insured as respects general liability per written contract." Both are statements typed by an agency employee. Neither is the endorsement. A checked box with no attached form is the single most common gap we see on real certificates.
Which endorsement you should be asking for
- CG 20 10 — Additional Insured, Owners, Lessees or Contractors (Scheduled Person or Organization). Covers ongoing operations: the period while the work is being performed.
- CG 20 37 — Additional Insured, Owners, Lessees or Contractors (Completed Operations). Covers claims that arise after the work is finished, which is when most construction-defect claims actually surface.
- Blanket additional insured wording — some policies add anyone the named insured is required by written contract to add. Convenient, but you still want to see the blanket form, because its trigger language decides whether your contract qualifies.
The ongoing-operations versus completed-operations distinction is where most requirement lists fall short.
Read: CG 20 10 vs CG 20 37Getting the entity name right
An endorsement that names "Maple Property Group" does not obviously protect "Maple Property Group LLC" or "Maple PG Management, as agent for Maple Holdings II LP" — and in a coverage dispute that ambiguity is the carrier's argument, not yours. Standardize the exact wording you require, put it in your vendor agreement, and check every incoming certificate against it character by character rather than by eye.
- Write the required additional-insured wording once, in your vendor agreement.
- Send that exact string to the vendor's agent when you request the certificate.
- On receipt, compare the certificate and the endorsement against the string.
- Store both documents together — the certificate alone is not the evidence you will want later.
What to do when the endorsement never shows up
Go to the producer, not the vendor. The agency issued the certificate and can attach the endorsement in minutes; the vendor usually cannot find the policy documents at all. A short, specific email — naming the policy number, the endorsement form you need, and the exact additional-insured wording — resolves this far more often than a generic "please send updated insurance" request to the vendor.