To understand a waiver of subrogation, you first have to understand subrogation itself.
What subrogation is
When your insurer pays a claim that was actually someone else's fault, it has the right to step into your shoes and recover that money from the at-fault party. That recovery right is called subrogation. Example: a subcontractor's mistake damages a building, the owner's insurer pays the owner, then that insurer pursues the subcontractor (or their insurer) to get its money back.
What a waiver does
A waiver of subrogation is an endorsement in which your insurer gives up that right to recover against a specific party. Even if that party caused the loss, the insurer agrees not to come after them.
Why contracts require it
Commercial contracts and leases routinely require each party to add a waiver in the other's favor. The logic: the parties have already agreed who bears which risks, and they don't want one side's insurer undoing that arrangement by chasing the other side after a loss. You'll see waivers required most often on general liability, workers' compensation, and property policies in construction contracts, leases, and vendor agreements.
How it's set up — and what it costs
- It's added by endorsement, so it's a real policy change, not just a line on a certificate.
- Carriers often charge a small additional premium (especially on workers' comp), because giving up recovery rights increases their exposure.
- It can be specific (one named party) or blanket (anyone the insured has contractually agreed to waive). Blanket waivers are convenient for clients who sign many contracts.
For agents: when a contract requires a waiver of subrogation, confirm the policy can add one, get the endorsement issued, and make sure the certificate reflects it. It's commonly requested in the same breath as additional insured status.
Educational only — confirm against the actual policy and your carrier's guidelines.