Additional Insured vs. Certificate of Insurance vs. Waiver of Subrogation
Contracts and leases routinely ask for additional insured status, a certificate of insurance, and a waiver of subrogation in the same breath. This page explains what each one actually does, why only some of them change coverage, and where to verify them in the policy.
At a glance
| Additional Insured AI | Certificate of Insurance (COI) COI | Waiver of Subrogation WOS | |
|---|---|---|---|
| What it is | An endorsement that extends your policy's coverage to another party | A document that summarizes and evidences your insurance | An endorsement in which your insurer gives up its right to recover from a named party |
| Does it change coverage? | Yes — it adds a party as an insured | No — it only reports coverage that already exists | Yes — it alters the insurer's recovery rights |
| Who benefits | The party added, such as a landlord, GC, or client | The party requesting proof of insurance | The party protected from your insurer's recovery action |
| Legal weight | Binding coverage under the endorsement terms | Informational only; grants no rights by itself | Binding contractual or endorsement term |
| Common contract phrase | "Name us as additional insured" | "Provide a certificate of insurance" | "Waive subrogation in our favor" |
Coverage, Proof, and Recovery Rights
These three terms show up together in contracts but do very different things. An Additional Insured endorsement actually extends your policy's coverage to another party. A Certificate of Insurance only describes coverage that already exists — it is proof, not protection. A Waiver of Subrogation changes what your insurer may do after it pays, giving up its right to recover from a named party.
The frequent misunderstanding is treating a certificate as if it grants rights. Standard ACORD certificates state plainly that they confer no rights and do not amend coverage. Only the underlying policy and its endorsements — additional insured and waiver of subrogation among them — actually change who is protected and who can be pursued.
Why Contracts Ask for All Three
A well-drafted contract typically requires the endorsements — additional insured and waiver of subrogation — to create the actual rights, plus a certificate as evidence that those endorsements are in place.
Endorsement Forms
Coverage is created by endorsement, so look for the attached additional insured and waiver of subrogation forms and their edition dates.
The Certificate Itself
An ACORD certificate of insurance lists carriers, limits, and dates but includes disclaimer language stating it grants no coverage.
Contract Insurance Requirements
The lease or subcontract's insurance requirements section spells out exactly which endorsements and evidence the other party must provide.
What it looks like on a real claim
Example 1 — Subcontract requires all three
A general contractor's subcontract requires the sub to add the GC as an additional insured, provide a COI, and waive subrogation. A sub's worker then damages the GC's $60,000 equipment.
The GC can seek defense and indemnity under the sub's policy as an insured
The GC holds a document proving coverage exists, but it grants no coverage by itself
The sub's insurer cannot later sue the GC to recover what it paid
Example 2 — California landlord and tenant
A California landlord's lease requires the tenant's liability policy to protect the landlord. A fire starts in the tenant's suite and spreads through the building.
The landlord is covered as an insured for liability arising from the tenancy
The landlord's certificate merely confirms the tenant's policy and limits on file
If added, the tenant's insurer waives its right to recover against the landlord
The bottom line
Additional insured status, a certificate of insurance, and a waiver of subrogation are often bundled into one contract clause, but they operate on three different levels: extending coverage, evidencing it, and limiting recovery. Only two of them change what the policy actually does.
For California businesses signing leases or subcontracts, the safest approach is to confirm the actual endorsements are attached to the policy rather than relying on the certificate alone. A certificate can show that coverage was requested, but the endorsement is what makes it real.