Answer-first summary: A certificate holder receives a copy of your certificate of insurance (COI) as proof you carry coverage — but has no rights to make a claim under your policy. An additional insured is added to your policy by endorsement and can actually file a claim against your coverage for liability arising from your work. Most contracts that ask for "proof of insurance" require both designations.
Who this is for: General contractors, subcontractors, commercial tenants, vendors, and any business that signs contracts requiring evidence of insurance.
TL;DR — Key Takeaways
- Certificate holder = proof only. The certificate of insurance (ACORD 25) evidences coverage; it does not create or transfer coverage rights.
- Additional insured = actual coverage rights. The AI endorsement (e.g., ISO CG 20 10) adds the named party to your policy so they can be defended and indemnified for qualifying claims.
- A vendor, landlord, or GC can be both — and usually should be. Listing them as certificate holder and additional insured satisfies most standard contract requirements.
- "Additional insured" must be added by your insurer via endorsement — a COI alone cannot create AI status, regardless of what it says.
- Waiver of subrogation is a third, separate requirement often bundled into the same contract clause; it prevents your insurer from suing the other party after paying your claim.
What Is a Certificate Holder?
A certificate holder is any party named in the "Certificate Holder" box on an ACORD 25 certificate of insurance. Naming someone as a certificate holder:
- Provides evidence that a policy exists as of the date of the certificate
- Does not by itself entitle that party to advance notice of policy cancellation — the current ACORD 25 states only that notice "will be delivered in accordance with the policy provisions." Cancellation-notice rights generally require a separate notice-of-cancellation endorsement and depend on the policy and state law
- Creates no coverage rights — the certificate holder cannot file a claim under the policyholder's policy
A certificate of insurance is not an insurance policy, not a contract of insurance, and cannot modify, extend, or alter the coverage afforded by the referenced policies. Most ACORD forms include this disclaimer explicitly. Courts across the US consistently hold that a COI does not bestow coverage on its named holder.
Common certificate holder examples: A commercial landlord who wants proof a tenant carries general liability; a municipality requiring a permit applicant to show auto liability; a general contractor verifying a subcontractor's workers comp.
What Is an Additional Insured?
An additional insured (AI) is an entity added to an insurance policy — typically a Commercial General Liability (CGL) policy — by endorsement. AI status grants real coverage rights:
- The AI can be defended by the policyholder's insurer for covered claims
- The AI can receive indemnification up to the policy limits for qualifying liability
- Coverage typically applies to liability arising out of the named insured's operations (the specific scope depends on the endorsement wording)
The most common AI endorsements are ISO forms:
| Endorsement | Coverage Scope |
|---|---|
| CG 20 10 (Ongoing Operations) | Covers liability arising from the named insured's ongoing work for the AI |
| CG 20 37 (Completed Operations) | Covers liability arising after the named insured's work is completed |
| CG 20 28 (Lessor of Leased Equipment) | For equipment lessors |
| CG 20 33 / CG 20 38 (Blanket AI) | Automatically adds AIs when required by written contract |
Most construction contracts require both CG 20 10 and CG 20 37, which together cover the full project lifecycle. Blanket AI endorsements (CG 20 33/38) are the most operationally efficient option for contractors with many clients — the endorsement activates automatically when a written agreement requires AI status.
Side-by-Side Comparison
| Feature | Certificate Holder | Additional Insured |
|---|---|---|
| How it's created | Named on ACORD 25 COI | Policy endorsement from insurer |
| Can file a claim? | No | Yes |
| Defense coverage? | No | Yes (under covered claims) |
| Adds cost to policy? | Minimal / none | May trigger small premium charge |
| Policy modification? | No | Yes — changes the policy |
| Cancellation notice? | Only if separately endorsed (not automatic) | Yes (as named on endorsement) |
| Requires insurer action? | Issuing agent can issue COI | Insurer must add endorsement |
| Turnaround time | Minutes (automated) | Hours to days |
| Typical requester | Landlords, municipalities | GCs, project owners, lenders |
When Are Both Required?
Most sophisticated commercial contracts — particularly in construction, commercial real estate, and vendor agreements — require all three of the following simultaneously:
- Certificate of insurance naming the other party as certificate holder
- Additional insured endorsement naming them on the CGL policy (and often the umbrella)
- Waiver of subrogation endorsement preventing your insurer from seeking recovery from them
Failing to provide any one of these, even if the others are in place, typically puts a subcontractor or vendor in breach of contract. A COI alone almost never satisfies a well-drafted indemnity clause.
How to Add an Additional Insured: Step-by-Step
- Review the contract language. Identify exactly what the other party requires — ongoing ops, completed ops, blanket AI, specific form numbers, and minimum limits (e.g., $1M per occurrence / $2M aggregate for CGL).
- Contact your broker or agent. Provide the full legal name of the entity to be added and their address. The exact legal name must match the contract.
- Request the correct endorsement. Your agent submits the AI request to the insurer or issues a blanket AI endorsement if your policy already includes one. Specify CG 20 10, CG 20 37, or both as required.
- Confirm the endorsement is issued. You should receive an endorsement page — not just an updated COI — confirming AI status. Review it to verify the correct entity name and scope.
- Issue the updated COI. Generate an ACORD 25 certificate reflecting the AI status, listing the additional insured in the description field and the certificate holder box. Note: the COI is evidence; the endorsement is the actual coverage.
- Deliver both documents. Send the COI and a copy of the AI endorsement (and waiver of subrogation endorsement, if required) to the requesting party before work begins or lease execution.
Real-World Example: Subcontractor on a Commercial Renovation
Scenario (illustrative — not a guarantee of specific outcomes):
Martinez Electrical LLC, a 12-person commercial electrical contractor in Texas, wins a subcontract on a $2.5M office renovation. The general contractor's contract requires:
- CGL: $1M per occurrence / $2M aggregate
- AI status (ongoing and completed operations) in favor of the GC, the property owner, and the owner's lender
- Umbrella: $5M excess over primary
- Waiver of subrogation on CGL and workers compensation
- Certificate holder: all three parties on the ACORD 25
What Martinez needs to do: - Request CG 20 10 + CG 20 37 endorsements naming all three parties (GC, owner, lender) — potentially three separate endorsements or a blanket AI endorsement already on the policy - Request a waiver of subrogation endorsement on both the CGL and workers comp policy - Issue three separate ACORD 25 certificates (one per certificate holder) plus copies of each endorsement
Approximate additional premium impact (illustrative): - Blanket AI endorsement on CGL: often $150–$500/year for small contractors, sometimes included at no charge - Completed operations AI: may be bundled or add $100–$400/year - Waiver of subrogation: CGL waiver often $50–$250/year; workers comp waiver $100–$300/year or a percentage surcharge (commonly 2–5% of WC premium in many states)
Martinez's agent at Morrow handles the endorsement requests, issues the certificates, and delivers the full compliance package within one business day — allowing the subcontract to execute on schedule.
Frequently Asked Questions
Q: Can a certificate of insurance make someone an additional insured? No. A certificate of insurance is evidence of existing coverage; it cannot create, extend, or modify coverage. Only an endorsement issued by the insurer can add an additional insured to a policy. This is a common misconception — some contracts attempt to use COI language to "grant" AI status, but courts uniformly reject this. The underlying policy endorsement controls.
Q: Does being an additional insured protect the AI for their own negligence? It depends on the endorsement wording. Older ISO forms (pre-2004) provided broader AI coverage, including some protection for the AI's own independent negligence. The 2004 and later ISO CG 20 10 and CG 20 37 forms limit coverage to liability "caused in whole or in part" by the named insured's acts or omissions. If the claim arises solely from the AI's own negligence, coverage under these forms may not apply. Some contracts specify pre-2004 form language or "primary and non-contributory" wording to maximize AI protection.
Q: What does "primary and non-contributory" mean for additional insureds? It means the named insured's policy pays first (primary), without seeking contribution from any insurance the additional insured carries (non-contributory). Without this endorsement, the insurer could argue both policies share the loss. Most GC and owner contracts require this wording explicitly, and it requires a specific endorsement (ISO CG 20 01 or similar).
Q: Can I be removed as an additional insured mid-policy? Yes. Unlike a named insured, additional insured status can often be removed by endorsement during the policy term. This is why project-specific AI endorsements and blanket AI endorsements can differ — always verify AI status is in force for the full project duration, including completed operations coverage, which should typically extend for the statute of repose (often 10 years in construction, though this varies by state [verify state]).
Q: What's the difference between additional insured and loss payee? A loss payee (or mortgagee) is a property insurance concept: a lender or equipment lessor named on a property policy to receive claim payments up to their financial interest. Additional insured is a liability concept. A lender financing real property is typically named as mortgagee/loss payee on the property policy and as additional insured on the CGL.
Q: Does adding an additional insured reduce my policy limits? Your per-occurrence and aggregate limits do not increase because of AI status — both the named insured and additional insured share the same policy limits. If a large claim exhausts the aggregate, the additional insured's recovery is also capped. This is one reason GCs often require subcontractors to carry high umbrella limits.
Q: How quickly can Morrow issue an additional insured endorsement? For most commercial lines accounts with in-force policies, Morrow can process an AI endorsement request and issue a compliant certificate within one business day, often same-day. Blanket AI endorsements already on a policy allow instant certificate issuance without a separate endorsement request.
Q: Is there a cost difference between listing someone as certificate holder vs. additional insured? Certificate holder status is typically free — it's just a designation on the ACORD 25 form. Additional insured status may carry a small endorsement premium, typically $50–$500 per year for small to mid-size commercial accounts, depending on the carrier, trade, and scope of coverage. Blanket AI endorsements often represent better value for contractors who regularly need to add multiple parties.
Why Morrow for Additional Insured and Certificate Management
1. Independent agency, multiple carrier options. Morrow places commercial P&C with multiple admitted and E&S carriers, giving us the flexibility to find a policy that already includes blanket AI endorsements — so you're never scrambling to add parties mid-project.
2. Same-day certificate and endorsement turnaround. We understand construction timelines and lease execution deadlines. Most AI endorsement requests and COI issuances are handled within one business day; many go same-day. We issue ACORD 25 certificates with the correct AI and waiver of subrogation language that satisfies contract compliance reviewers.
3. Contract language review. When you send us a contract's insurance requirements section, we compare it to your current policy and flag every gap — missing AI form numbers, non-contributory language, umbrella follow-form requirements, completed operations periods — before you execute.
4. Experienced across trades and industries. We work with general contractors, subcontractors, commercial tenants, staffing companies, technology vendors, and other businesses where AI and certificate requirements are routine. We speak the language of construction contracts, master service agreements, and commercial leases.
5. Real claims advocacy. If a covered claim arises involving an additional insured, we advocate on your behalf — and theirs — with the carrier to ensure the claim is handled correctly under the endorsement. We don't disappear after the bind.
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Trust strip: Morrow (Afthonea Inc., DBA Morrow) is an independent commercial P&C insurance agency licensed in [Morrow to confirm — state licensing list]. We place coverage with multiple admitted and specialty carriers. [Morrow to confirm — Google/BBB review count and rating.]
Related Pages
- Commercial General Liability Insurance — Overview
- Certificate of Insurance: What It Is and What It Covers
- Waiver of Subrogation Explained
- General Contractor Insurance Requirements
- Additional Insured Endorsement Cost
- Named Insured vs Additional Insured
Author: [Morrow to confirm — licensed commercial P&C agent/broker name and credentials, e.g., CPCU, CIC] Published: June 2026 Last updated: June 2026
Sources: - ISO (Insurance Services Office) CG 20 10, CG 20 37, CG 20 33, CG 20 38 endorsement forms - ACORD 25 Certificate of Insurance / Evidence of Property Insurance form - National Association of Insurance Commissioners (NAIC) — consumer guidance on certificates of insurance - Insurance Information Institute (III) — commercial lines coverage explainers - State department of insurance guidance on certificate of insurance usage (varies by state; several states, including New York and Texas, have enacted statutes prohibiting misuse of COIs) - Associated General Contractors of America (AGC) — contract insurance requirements guidance