What Is an Additional Insured and Why Do Clients Ask for It?

An additional insured is a person or organization—other than the named insured—who receives coverage under your commercial liability policy, typically because of a written contract requiring it. Clients, property owners, and general contractors request it to protect themselves from lawsuits arising out of your work. Who this is for: contractors, service providers, consultants, and any business that signs client contracts.

TL;DR — Key Takeaways

• An additional insured is added to your policy via endorsement; they are NOT the same as a certificate holder.
• Coverage extends to the additional insured only for liability arising from your operations, not their own independent acts (on most standard endorsements).
• Clients request it so they can be defended and indemnified under your policy if a third party sues them for something your work caused.
• Adding an additional insured rarely raises your premium—but the endorsement type matters (blanket vs. scheduled; ongoing vs. completed operations).
• Failing to provide additional insured status when contractually required can void your contract and expose you to uncovered losses.

What Exactly Does "Additional Insured" Mean?

Under a standard ISO Commercial General Liability (CGL) policy, the Named Insured is the business that purchased the policy. An Additional Insured (AI) is a separate party granted certain rights under that policy through an endorsement—usually ISO form CG 20 10 (ongoing operations), CG 20 37 (completed operations), or both.

The additional insured gets:

1. The right to be defended by your insurer if sued for claims covered under your policy.
2. Indemnification from your policy for damages arising out of your work or operations.
3. Notice of cancellation (often required by contract, typically 30 days).

The additional insured does not get:

• Coverage for their own independent negligence (on standard CG 20 10/37 endorsements; broader, older-edition AI endorsement forms can expand this).
• The ability to file first-party property claims.
• Any increase in your policy limits—they share your per-occurrence limit.

Additional Insured vs. Certificate Holder — What's the Difference?

This is the most common source of confusion in commercial contracts.

A certificate of insurance (COI) proves coverage exists. An additional insured endorsement actually extends coverage. A client who only asks for a COI and not an AI endorsement is leaving themselves unprotected.

Why Do Clients and General Contractors Ask for It?

Clients and GCs request additional insured status to shift financial risk back to the party doing the work. Here's the logic:

• If you're a plumber and a pipe you installed fails three months later, flooding a tenant's office, the building owner may be sued alongside you.
• Without AI status, the building owner must defend that lawsuit on their own policy and pay their own deductible.
• With AI status, they tender the defense to your insurer, preserving their own policy limits and loss history.

This is especially common in:

• Construction and trades — GCs require AI status from every subcontractor before work begins.
• Property management — landlords require it from vendors, landscapers, and maintenance contractors.
• Staffing and professional services — corporate clients require it from consultants and agencies.
• Special events — venues require it from caterers, AV companies, and event planners.

What Is "Primary and Non-Contributory" and Why Do Contracts Demand It?

Many contracts go beyond basic AI status and require primary and non-contributory (P&NC) language.

• Primary means your policy responds first—before the additional insured's own policy.
• Non-contributory means your policy pays without demanding the additional insured's insurer contribute.

Without P&NC, insurers can "co-insure"—splitting costs—which forces the additional insured to burn their own deductible and limits. ISO endorsement CG 20 01 or similar carrier-specific forms are used to add P&NC language. If a contract requires it and your policy doesn't have it, you may be in breach.

Blanket vs. Scheduled Additional Insured Endorsements

Most contractors with active client contracts benefit from a blanket additional insured endorsement (CG 20 33 or similar), which auto-covers any party you're contractually required to add, without requiring a policy change each time.

How to Add an Additional Insured — Step by Step

1. Receive the contract. Review the insurance requirements section; identify if AI status is required and what form (CG 20 10, CG 20 37, P&NC, blanket, etc.).
2. Contact your broker. Forward the contract's insurance requirements to your Morrow broker. Do not assume your current policy already covers it.
3. Confirm endorsement type. Your broker verifies whether your policy already includes a blanket AI endorsement or whether a scheduled endorsement needs to be added.
4. Issue the certificate. Once confirmed, your broker issues a COI listing the additional insured with the correct endorsement form numbers noted in the Description of Operations box.
5. Deliver to client. Send the COI (and endorsement copy if required) before work begins.
6. Keep records. Retain the contract, COI, and endorsement on file for at least as long as the statute of limitations for completed operations claims in your state (typically 3–6 years, sometimes longer for construction [verify state]).

Real-World Example: Electrical Subcontractor in Texas

Illustrative example — not a guarantee of coverage or outcome.

Situation: A Dallas-based electrical subcontractor ("ElecCo") is hired by a general contractor ("BuildCo") to wire a new commercial office building. The contract requires ElecCo to name BuildCo as an additional insured on both ongoing and completed operations, with P&NC language, on a $1M per-occurrence / $2M aggregate CGL policy.

What happens 14 months after project completion: A tenant reports an electrical fire traced to a junction box ElecCo wired. The building owner sues BuildCo for $600,000 in property damage and lost rents. BuildCo tenders the claim to ElecCo's insurer under the AI completed operations endorsement (CG 20 37).

Outcome: ElecCo's insurer defends BuildCo, pays the settlement of $480,000, and BuildCo's own policy is untouched. ElecCo's own deductible (say, $2,500) applies to ElecCo's defense, not BuildCo's.

Without the AI endorsement: BuildCo would have had to defend under its own policy, likely triggering a $10,000–$25,000 deductible and a future premium increase—and might have sued ElecCo separately for breach of contract.

Typical cost of adding AI status in this scenario: $0–$150/year additional premium for a blanket endorsement already on the policy; possibly $200–$500 for a standalone completed operations extension if not already included.

Frequently Asked Questions

Q: Does adding someone as an additional insured increase my premium? Usually minimally or not at all. If you already have a blanket AI endorsement—common on contractor policies—adding another party costs nothing. Completed operations coverage sometimes carries a small additional premium ($50–$300/year depending on trade and exposure). A scheduled endorsement for a one-time client is often free.

Q: What is the difference between an additional insured and a loss payee? A loss payee is a party (typically a lender or lessor) with a financial interest in your property who receives first-party property claim payments. An additional insured receives liability coverage—defense and indemnity if sued. These are different endorsements for different coverage lines.

Q: Can my client's own negligence be covered under my additional insured endorsement? Generally no. ISO CG 20 10 and CG 20 37 limit coverage to liability arising out of your operations. If the client causes an accident entirely on their own with no connection to your work, your policy won't cover them. Some broader AI endorsements or P&NC language can shift more risk, but pure independent negligence is typically excluded.

Q: Do I need to list every additional insured on my policy manually? Not if you have a blanket AI endorsement. Blanket endorsements automatically cover any party that a written contract requires you to name as an AI, without manual updates. Confirm with your broker that "blanket" language is on your policy before assuming it.

Q: What happens if I forget to add an additional insured before starting work? You may be in breach of contract. The client may have the right to stop work, terminate the contract, or withhold payment. If a claim occurs during a period when the AI endorsement was missing, coverage for that party may be denied. Always get AI status confirmed before mobilizing.

Q: Does additional insured status on my GL policy also apply to my umbrella/excess policy? It depends. Many umbrella policies follow-form—meaning AI status on the underlying GL flows up to the umbrella—but some require separate AI endorsements on the umbrella itself. Contracts often specify "additional insured status on all applicable policies including excess." Confirm with your broker.

Q: How long does additional insured coverage last under completed operations? The policy's completed operations coverage period applies (typically the same annual policy term, renewed each year). Contracts sometimes require you to maintain completed operations AI coverage for 2–10 years post-project, particularly in construction. Your broker should track renewal continuity to avoid gaps.

Q: Is a certificate of insurance enough, or does the client need the actual endorsement? A COI is evidence of coverage, not coverage itself. Some clients and GCs now require a copy of the actual endorsement, not just a certificate notation. Your broker can provide both. If the contract says "provide evidence of AI status including endorsement," issue both documents.

Why Morrow for Additional Insured Certificates and Contractor Insurance

1. Fast COI and endorsement turnaround. Morrow brokers understand that contract execution waits on insurance paperwork. We prioritize same-day certificate issuance for active clients and can confirm AI endorsement form numbers in the description of operations so clients receive what they actually need.

2. Independent agency — multiple carrier options. As an independent agency, Morrow places coverage with multiple A-rated carriers, meaning we can find policies that already include blanket AI, P&NC, and completed operations as standard—rather than charging add-on fees for each.

3. Contract language review. We read your client contracts' insurance sections and tell you exactly what endorsements are required before you sign, flagging mismatches between what you have and what's needed.

4. Specialization in contractors and trade businesses. Morrow has experience placing CGL, inland marine, tools and equipment, workers compensation, and umbrella policies for contractors across trades including electrical, plumbing, HVAC, general construction, landscaping, and specialty subcontractors. [Morrow to confirm specific trade verticals]

5. Claims advocacy when it matters. When a claim comes in involving your additional insured, Morrow advocates on your behalf to ensure the endorsement is interpreted correctly and the claim is handled efficiently—protecting both your relationship with the client and your loss history.

Get Your Additional Insured Certificate Fast

If a client just sent you a contract requiring additional insured status, don't wait. Contact Morrow today and we'll review your current policy, confirm or add the right endorsements, and issue your COI.

Get a Quote → | Request a Certificate →

Licensed independent commercial insurance agency. [Morrow to confirm licensed states and NPN]. Carriers rated A (Excellent) or better by AM Best. [Morrow to confirm carrier list and any applicable ratings.]

Related Resources

• Commercial General Liability Insurance — The Complete Guide
• What Is a Certificate of Insurance (COI) and What Does It Prove?
• Waiver of Subrogation: What Contractors Need to Know
• GL Insurance Cost by Trade: What Contractors Actually Pay
• Umbrella vs. Excess Liability: Which Do You Need?

Author: Content reviewed by the Morrow commercial lines team, including licensed P&C producers with experience in contractor and trade business insurance placements. Published: June 2026 Last updated: June 2026

Sources: - Insurance Services Office (ISO), CGL Policy Form CG 00 01 and endorsements CG 20 10, CG 20 37, CG 20 33, CG 20 01 - National Association of Insurance Commissioners (NAIC), Model Regulation resources - Insurance Information Institute (III), "Commercial General Liability" reference materials - State Department of Insurance publications (applicable per client's state of operation) - Industry guidance from the Independent Insurance Agents & Brokers of America (Big I / IIABA)