What does an additional insured endorsement mean?

What an additional insured endorsement means in plain terms

Your general liability policy has a section called “Who Is An Insured” that lists the people covered: you, your employees acting for the business and a few others. An additional insured endorsement amends that section to add another person or organization. IRMI, an insurance reference publisher, describes it simply as an endorsement used to add coverage for additional insureds by name, such as lessors or mortgage holders.

In practice, the party added is the one that could be sued because of what you do on their job or property. If a passer-by is hurt by your crew’s work and sues both you and the building owner, the owner can ask your insurer to defend and pay for them, instead of going to its own insurer. Jones, a certificate tracking company, notes that landlords and property managers ask for this partly to keep claims off their own loss history and avoid premium increases.

The endorsement does not make the other party a co-owner of your policy. You remain the named insured: you buy the policy, pay the premium and control changes and cancellation, while the additional insured has none of that authority.

Named insured, additional insured or certificate holder

The three labels are often confused on contracts and certificates, but they carry very different rights. A certificate of insurance on its own only proves you have a policy; it does not add anyone to it.

What “caused, in whole or in part, by” your work means

The 2013 editions of the standard ISO endorsements cover the additional insured only for injury or damage caused, in whole or in part, by your acts or omissions, or those of people acting on your behalf. That means the additional insured is covered when you are at least partly at fault, but generally not for an accident that is entirely their own doing. Jones puts it the same way: if an accident is not the result of the named insured’s negligence, no rights accrue to the additional insured.

The same forms add two more limits. The coverage applies only to the extent permitted by law, and it will not be broader than what your contract requires you to provide. The insurer’s maximum for the additional insured is the amount the contract requires or your policy limit, whichever is less, and the endorsement does not increase your limits.

Not every endorsement uses this wording, because many policies carry an insurer’s own equivalent form. The insurance partner of the National Council for Mental Wellbeing warns that some parties ask to be covered even for claims that are solely their fault, and that depending on the wording your insurer can end up paying all of a claim the other party partly caused.

Ongoing operations vs. completed operations

Construction contracts usually ask for both, because the standard forms split coverage by time. The ongoing operations form stops at the end of the job, and the completed operations form picks up after it.

What it means for your own policy

Adding someone is usually quick, but it has real effects on the policy you pay for:

• Shared limits: money paid to defend or settle for the additional insured comes out of your limits, which can leave less for claims against you.
• Defense costs: the National Council article notes that defending an additional insured often brings extra legal and expert fees.
• Loss history: claims paid under the endorsement count against your loss history, which can raise renewal premiums.
• Premium: Embroker says adding one party often costs little, probably no more than $50 at many insurers, though the endorsement can still add to your overall premium. Blanket endorsements, which Insureon describes as covering anyone who meets a description rather than a named party, are often cheaper when you have many clients.
• Related clauses: contracts that ask for additional insured status often also require primary and noncontributory wording and a waiver of subrogation, which shift more of the cost to your insurer.

How to handle a request for additional insured status

Send the insurance section of the contract to your agent before you sign, not after. Ask three questions: does my policy already include a blanket additional insured endorsement that meets this, does the contract require completed operations as well as ongoing, and does it ask for coverage of the other party’s sole negligence.

Give the other party the endorsement itself, or a certificate that references the specific form, rather than a certificate with vague wording. Vertikal RMS warns that a line such as “additional insured as required by contract” does not confirm that an endorsement exists. If the contract asks for more than your policy provides, it is usually easier to negotiate the clause than to fix a gap after a claim. A broker such as Florin can review the contract wording and compare policies that include the endorsements your clients ask for.