Naming someone as additional insured extends your general liability policy to cover them for claims arising out of your work. Most construction contracts require it before you can start. The two things contractors miss are the difference between ongoing operations coverage, which ends when you finish the job, and completed operations coverage, which responds to claims that surface afterward, and the extra clauses often bundled with it, primary and non-contributory wording and waiver of subrogation. Each of those shifts real risk onto your policy, and coverage depends on the endorsement form and policy wording.
What the Endorsement Actually Does
When a contract says "name us as additional insured," it is asking you to extend your general liability policy to protect that party for claims arising out of your work. It is added by endorsement, and the endorsement form controls what is actually covered.
This is not a formality. You are agreeing that your policy, your limits, and your carrier's defense obligation will stand in front of someone else's insurance for a defined category of claims.
The Gap Most Contractors Do Not Know They Have
There are two categories, and contracts frequently require both while contractors frequently carry only one.
Ongoing operations covers the additional insured for claims arising while you are performing the work. When you demobilize, that protection stops.
Completed operations responds to claims that surface after the work is finished. This is the one contractors miss, and in California it is the one that matters most, because latent construction defect claims can be brought for up to ten years after substantial completion under Code of Civil Procedure Section 337.15.
A GC who required completed operations status in the contract, and received a certificate showing only ongoing operations, has a gap. So does the contractor, because they are now in breach of the agreement they signed.
The Clauses That Ride Along
Additional insured language rarely arrives alone. Two clauses almost always accompany it:
- Primary and non-contributory. Your policy pays first, and your carrier cannot ask the other party's carrier to contribute. Without this, carriers argue about who pays and your defense gets slower and messier.
- Waiver of subrogation. Your carrier gives up its right to recover from the other party, even when that party caused the loss. Carriers generally accept it when a written contract requires it, but it must be endorsed onto the policy to be effective.
Both shift risk toward your policy. Both are standard in construction contracting. Neither is automatic.
The Practical Sequence
- Read the insurance exhibit before you sign, not after the compliance email arrives.
- Send the exhibit to your broker and ask directly whether your current policy satisfies it.
- Request the certificate and the actual endorsement forms, not just the certificate.
- Confirm the endorsement matches what the contract requires, particularly the completed operations piece.
- Keep the documents through the statute of repose period, not just through the job.
Why the Certificate Alone Is Not Enough
A certificate of insurance is a summary. It confirms that coverage existed on the date it was issued, and it does not amend the policy. The endorsement is the document that actually grants additional insured status.
Sophisticated general contractors increasingly request the endorsement forms directly for this reason. If your certificate says additional insured but no endorsement exists on the policy, the certificate does not create coverage.
The Bottom Line
Additional insured status is a normal cost of doing construction work, and there is nothing wrong with granting it. The mistakes are procedural: agreeing to completed operations without carrying it, signing a waiver requirement without the endorsement in place, and treating the certificate as if it were the coverage.
Read the exhibit, ask your broker before you sign, and get the endorsements. It takes a phone call and prevents the category of dispute that surfaces years later, when the job is long finished and the documentation is hard to reconstruct.
Frequently Asked Questions
What does additional insured actually mean?
It means your general liability policy is extended to protect another party, usually the general contractor, property owner, or developer, for claims that arise out of your work. If someone is injured because of your operations and sues both you and the GC, your policy can defend and indemnify the GC as well. It does not make them a policyholder and it does not cover their own independent negligence in most standard forms.
What is the difference between ongoing and completed operations?
Ongoing operations coverage protects the additional insured for claims arising while you are actively performing the work. Completed operations coverage responds to claims that surface after the job is finished. Many contracts require both, and many contractors carry only ongoing. In California this gap matters more than in most states because the statute of repose for latent construction defects runs ten years under Code of Civil Procedure Section 337.15, so claims can appear long after final payment.
What does primary and non-contributory mean?
Primary means your policy pays first, before the additional insured's own insurance. Non-contributory means your carrier cannot ask their carrier to share the loss. Together the clauses put your policy at the front of the line for covered claims. Contracts routinely require this language, and carriers usually add it by endorsement, but it is not automatic on every policy.
Should I agree to a waiver of subrogation?
It is common and often unavoidable on construction contracts. A waiver of subrogation means your carrier gives up the right to recover from the other party even if that party caused the loss. Carriers generally accept it when it is required by written contract, but it needs to be endorsed onto the policy. Signing a contract that requires it without confirming your policy carries the endorsement is how contractors end up in breach of their own agreement.
Does adding an additional insured raise my premium?
Adding a single additional insured on a blanket endorsement typically has little or no separate charge on most contractor policies. Broader requirements can affect pricing, particularly completed operations status for a large number of parties or unusually broad wording. The larger cost driver is usually the underlying limits the contract requires rather than the endorsement itself.
Can I be required to add someone after the job has started?
Contracts sometimes require it retroactively, and carriers can often add an additional insured effective a past date, but not always, and not after a claim has occurred. The safe practice is to read the insurance exhibit before signing and request the certificate and endorsements before mobilizing, rather than after the GC's compliance department flags you.