Anyone whose liability exposure stems from your business operations should be listed as an additional insured on your commercial general liability policy. In practice, that usually means your landlord, the general contractor and property owner on any construction project, clients who hire you under a written contract, event venues you rent, government entities that issue you permits, and retailers who sell products you manufacture. The specific parties depend on your industry, your contracts, and the physical spaces where you work.
Adding a party as an additional insured extends your policy’s defense and indemnity to that third party for claims tied to your work, so they do not have to turn to their own insurer first. The sections below walk through the categories of parties that commonly require this status and the companion contract terms that almost always travel with it.
Landlords and Property Owners
If you lease office space, a storefront, a warehouse, or heavy equipment, the owner will almost certainly require additional insured status. Commercial leases include this requirement because the landlord faces potential lawsuits — a customer slipping in your leased space, for example — even though you control day-to-day operations. Adding the landlord to your policy means your insurer defends and covers them for claims tied to your use of the property, and keeps the landlord’s own insurance out of the picture.
Many leases go further and require your policy to respond as the primary layer, so the landlord’s insurer does not need to contribute at all. ISO endorsement form CG 20 11, designed specifically for lessors of premises, limits coverage to liability arising from the portion of the property leased to you, which keeps the scope well-defined for both sides.
General Contractors and Project Owners
Construction projects involve a layered chain of responsibility. Subcontractors at every tier are typically required to name the general contractor, and often the property owner or developer, as additional insureds. If your crew’s work causes an injury or damages neighboring property, the general contractor and the project owner both face lawsuits, and additional insured status gives them a direct path to your insurer.
This flows downward through the project hierarchy. The general contractor names the project owner on its own policy, then requires every subcontractor to name both the general contractor and the project owner. Securing the endorsement is a standard prerequisite for commercial and government construction bids, and work typically cannot begin until certificates of insurance confirming the status reach the requesting party.
For ongoing work, the ISO CG 20 10 endorsement is standard. For claims that surface after your work is finished, CG 20 37 covers the “completed operations” period. Many construction contracts require both, because defects can trigger lawsuits years after a project wraps up. Providing only CG 20 10 leaves the additional insured uncovered once your crew leaves the site.
Clients Who Hire Your Business
Outside construction, any client who hires your company for professional or commercial services may require additional insured status by contract. IT consultants, marketing agencies, janitorial companies, security firms, and countless other service providers see this demand regularly. The logic is the same: if your work on a client’s behalf leads to a third-party injury or property damage claim, the client wants your policy to respond first.
These requirements usually appear in the master service agreement or the statement of work, and the client will ask for a certificate of insurance before the engagement begins. If you cycle through many clients, a blanket additional insured endorsement — which extends coverage to any party you are contractually required to cover, without listing them individually — avoids calling your insurer for every new contract. Confirm with your agent that the blanket wording actually reaches the parties your contracts name, since some insurers have argued that blanket language requiring a “direct written agreement” does not extend down multi-tier contractual chains.
If you are a freelancer or sole proprietor and a new client insists on being added, treat it as a normal cost of doing business. It is not an unusual request.
Event Venues and Government Entities Issuing Permits
Rent a banquet hall, convention center, or park pavilion, and the venue owner will almost always require additional insured status before the event. The venue faces potential lawsuits from guests injured during your event, and the endorsement puts your insurer in front of those claims. Some venues require multiple entities to be listed, such as both the facility management company and the building owner.
Government entities apply the same principle to permits. If you obtain a permit for a street fair, a film shoot, construction work on public land, or any activity in a public right-of-way, the city or county will typically require additional insured status on your general liability policy. ISO form CG 20 12 exists specifically for state or political subdivisions that have issued permits, and it limits coverage to operations you perform under the permit.
Retailers and Distributors of Your Products
If you manufacture a product, the retailers and distributors who sell it face product liability lawsuits when a defective item injures a consumer, even though the retailer had nothing to do with the defect. Distribution agreements typically require the manufacturer to add the retailer as an additional insured through a vendor’s endorsement, which gives the retailer products liability coverage under the manufacturer’s policy and eliminates the need for the retailer to buy separate coverage for upstream defects.
On the retail side, confirm that the endorsement specifically covers the products you are distributing and that it has been formally issued. A promise in a distribution agreement is not the same as an active endorsement on a policy. On the manufacturer side, expect this request from every major retailer and factor it into your distribution costs.
Primary and Non-Contributory Coverage
Many contracts do not simply require additional insured status. They also require your policy to be “primary and non-contributory.” The “primary” part means your policy pays first. The “non-contributory” part means your insurer cannot ask the additional insured’s own insurance to chip in before your limits are exhausted.
Without this language, both insurers might argue the other should pay, delaying the claim and potentially dragging the additional insured into a coverage dispute. The ISO CG 20 01 endorsement establishes this arrangement formally, provided the additional insured is a named insured under their own separate policy and you agreed in writing that your coverage would be primary and non-contributory. If your contract calls for this, make sure the endorsement is actually attached to your policy, not just referenced in the agreement.
Waiver of Subrogation
Contracts that require additional insured status often also require a waiver of subrogation. Subrogation is the process by which your insurer, after paying a claim, steps into your shoes to recover the money from whoever caused the loss. A waiver of subrogation prevents your insurer from suing a specific third party, usually the same party named as an additional insured, to recoup what it paid.
The two protections are complementary but distinct. Additional insured status extends coverage to the third party; a waiver of subrogation keeps your insurer from later turning around and suing that same party. Construction contracts commonly require both, because delays caused by project participants suing each other are costly. Adding a waiver endorsement typically costs between $50 and $150, though blanket waivers covering all contracts may increase your overall premium by a small percentage.
Additional Insured vs. Additional Interest
These terms sound similar and provide very different levels of protection. Confusing them can leave a third party exposed.
An additional insured receives actual coverage under your liability policy. Your insurer will defend and pay claims on their behalf for covered incidents tied to your operations. An additional interest, by contrast, simply receives notifications about your policy status. That party is told if your policy is renewed, cancelled, or modified, but they are not covered for claims.
The most common additional interest is a bank or lender that financed your vehicle or equipment. The lender has a financial stake in the insured property and needs to know the coverage is active, but it is not performing operations that would expose it to liability claims. A landlord, by contrast, needs actual coverage because guests and visitors can sue the property owner. If a contract requires you to add a party, read carefully to see which status is being requested.
The Limits of Additional Insured Coverage
Adding someone to your policy does not give them the same protection as the named insured. Several limitations apply, and both sides should understand them before relying on the arrangement.
- Coverage reaches only liability arising from your work or operations. If the additional insured’s own independent actions cause an injury, unrelated to what you did, your policy will not respond. Many endorsements include a sole negligence exclusion, so the additional insured has no coverage when they are the only party at fault.
- An additional insured cannot modify the policy, change coverage limits, or cancel the endorsement. Only the named insured and the insurer control the terms.
- Claims paid on behalf of an additional insured reduce your aggregate policy limits. If your policy has a $1 million aggregate and your insurer pays $300,000 defending an additional insured, you have $700,000 left for the rest of the policy period. Adding multiple additional insureds raises the risk that your limits will be depleted before a claim of your own arises.
- Ongoing operations coverage (CG 20 10) and completed operations coverage (CG 20 37) are separate. If your contract requires both and your endorsement provides only ongoing operations, the additional insured has no coverage after your work is finished.
Because limits are shared, factor the number of additional insureds you routinely add into your decisions about aggregate limits and whether an umbrella policy makes sense.
How to Add a Party to Your Policy
Start by collecting the party’s full legal name and physical address exactly as they want it on the certificate. Identify the relationship — landlord, general contractor, client, venue, permit-issuing agency, retailer — because the endorsement form depends on the arrangement. For construction, confirm whether the contract requires ongoing operations coverage (CG 20 10), completed operations coverage (CG 20 37), or both, and whether primary and non-contributory wording or a waiver of subrogation is also required.
Submit the request through your insurer’s online portal, your broker or agent, or the carrier directly. Most insurers charge a fee per endorsement, commonly $25 to $150 depending on the carrier and the coverage type. Once processed, the insurer issues a certificate of insurance as proof. Turnaround is typically one to two business days, and some digital platforms are faster.