Endorsement

Q: What is the difference between an Additional Insured and a Certificate Holder?

A Certificate Holder is simply listed on the COI as a party that receives a copy — they have no additional rights under the policy. An Additional Insured is added by endorsement and has actual rights to make a claim under your policy for covered losses in which your operations are implicated.

An endorsement is a written amendment attached to a commercial insurance policy that adds, removes, or modifies coverage terms — superseding any conflicting language in the base policy form. Endorsements are also called riders or policy amendments. Every change to your policy after it is issued must be documented as a formal endorsement.

Who this is for: Business owners, contractors, and risk managers who want to understand how policy endorsements work, when they are required, and what they cost.

TL;DR / Key Takeaways

An endorsement legally overrides conflicting language in the base policy form; if you want a coverage change, it must be in writing as an endorsement.
Common endorsements include Additional Insured, Waiver of Subrogation, Primary & Non-Contributory, Hired & Non-Owned Auto, and Blanket Additional Insured.
Some endorsements broaden coverage (adding cyber liability to a BOP); others restrict it (excluding certain job sites or operations).
Additional Insured endorsements are routinely required by general contractors, property owners, lenders, and government agencies before work begins.
Endorsement premiums range from $0 (no additional charge) to hundreds of dollars per year depending on the type and insured's exposure.

What Is an Endorsement in Insurance?

An endorsement is a legally binding document that is attached to — and made part of — an insurance policy. Once attached, it carries the same legal weight as the base policy form itself. If the endorsement conflicts with the base form, the endorsement language controls.

Endorsements can be issued at policy inception, at mid-term (anytime during the policy period), or at renewal. The carrier records every endorsement on the policy declarations page so there is a complete audit trail of changes.

Common Reasons a Business Needs an Endorsement

A general contractor requires that a subcontractor add them as an Additional Insured before work begins on a project.
A commercial landlord requires a Waiver of Subrogation before a tenant may occupy the space.
A client contract requires the sub's policy to respond on a Primary & Non-Contributory basis.
A business whose employees run errands in rented vehicles and their own personal cars needs a Hired & Non-Owned Auto endorsement.
A professional services firm expands into a new state and needs the policy updated to reflect the new exposure.

Types of Endorsements: A Comparison

Endorsement Type	What It Does	Who Typically Requires It	Typical Additional Cost
Additional Insured (Scheduled)	Names a specific person/entity as insured under your policy	GCs, property owners, lenders	$0–$100/yr per entity (varies by carrier)
Blanket Additional Insured	Automatically covers any party required by written contract	GCs managing many subs	$50–$300/yr added to GL premium
Waiver of Subrogation	Prevents carrier from suing a named third party after paying a claim	Landlords, project owners	$0–$150/yr per entity
Primary & Non-Contributory	Makes your policy respond first before the AI's own coverage	GCs, municipalities	Included or $0–$75/yr
Hired & Non-Owned Auto	Covers vehicles you rent or employees use their own cars for business	Any business without a fleet	$100–$500/yr
Equipment Breakdown	Covers sudden mechanical or electrical failure of covered equipment	Manufacturers, restaurants	$150–$600/yr
Cyber Liability Extension	Adds first-party cyber coverage to a BOP	SMBs without standalone cyber	$300–$1,500/yr
Pollution Exclusion Endorsement	Restricts or eliminates pollution coverage	Carriers on environmental risks	Reduces premium or $0 additional
Employee Benefits Liability	Covers errors in administering employee benefit programs	Employers with benefit plans	$100–$400/yr
Cross-Liability / Separation of Insureds	Treats each insured as if a separate policy were issued	Any policy with multiple insureds	Usually $0 (standard in many forms)

Cost ranges are illustrative industry estimates as of 2025-2026. Actual premiums depend on industry, payroll, revenue, claims history, and carrier underwriting guidelines.

How an Endorsement Gets Added to a Policy (5 Steps)

Identify the requirement. A contract, lease, or lender specifies the endorsement needed — for example, "Name XYZ General Contractor as Additional Insured on a Primary & Non-Contributory basis with Waiver of Subrogation."
Submit the request to your agent or broker. Provide the exact legal name, address, and relationship of the party to be added. Your agent (like Morrow) submits an endorsement request to the carrier.
Carrier reviews and issues the endorsement. For standard endorsements on admitted policies, turnaround is typically same-day to 48 hours. Complex or non-standard requests may take longer.
Endorsement is attached to the policy. The carrier issues a formal endorsement document with an effective date, an endorsement number, and any additional premium charge. The policy declarations page is updated.
Provide evidence of the endorsement. A new Certificate of Insurance (ACORD 25) is issued reflecting the endorsement. For AI requirements, the certificate must show the additional insured's name; often the actual endorsement form must also be provided.

Real-World Example: Subcontractor Adding an Additional Insured

Scenario (illustrative — not a guarantee of coverage or outcome):

Cascade Tile Works, a Portland, Oregon tile contractor with $1.2M in annual revenue, wins a commercial retail build-out subcontract. The general contractor's subcontract agreement requires:

Cascade's CGL policy must name Redwood Construction Group, LLC as an Additional Insured on a Primary & Non-Contributory basis.
A Waiver of Subrogation in favor of Redwood.
Minimum CGL limits of $1M per occurrence / $2M aggregate.

Cascade contacts Morrow. Morrow submits endorsement requests to Cascade's CGL carrier. The carrier issues:

ISO CG 20 10 (Additional Insured — Ongoing Operations) and CG 20 37 (Additional Insured — Completed Operations) naming Redwood Construction Group, LLC.
ISO CG 24 04 (Waiver of Transfer of Rights of Recovery — Waiver of Subrogation) in favor of Redwood.
A Primary & Non-Contributory wording endorsement.

Additional annual premium: approximately $185 for this project's endorsements. Morrow turnaround on the certificate and endorsement copies: same business day. The GC accepts the documentation and Cascade mobilizes on schedule.

Note: ISO endorsement form numbers referenced are industry-standard forms. Actual forms issued depend on the carrier's filed forms and state availability. Oregon-specific requirements [verify state] may apply.

FAQ

What is the difference between an endorsement and a rider?

The terms are used interchangeably in commercial P&C insurance. "Endorsement" is the industry standard term in property and casualty lines; "rider" appears more often in life and health insurance. Both refer to a written amendment that changes the terms of a base policy.

Does an endorsement change my premium?

It depends on the endorsement. Some endorsements that add coverage (e.g., Additional Insured) carry a small additional premium — often $0 to a few hundred dollars per year. Others that restrict coverage (e.g., an exclusion endorsement) may reduce premium. Many standard endorsements required by contracts are issued at no additional charge by some carriers.

Can an endorsement be added mid-policy?

Yes. Endorsements can be added at any point during the policy period. A mid-term endorsement will carry a specific effective date. If an additional premium applies, the carrier will pro-rate the charge for the remaining days of the policy period.

Is a Certificate of Insurance the same as an endorsement?

No. A Certificate of Insurance (ACORD 25) is a summary document that provides evidence of insurance. It does not create, modify, or guarantee coverage. The endorsement is the actual legal document attached to the policy that changes coverage terms. Many contracts require both: the endorsement (to actually change the policy) and a COI (to evidence it).

What is a "Blanket Additional Insured" endorsement?

A Blanket Additional Insured endorsement automatically extends Additional Insured status to any party that your written contract requires you to name as an additional insured — without having to list each party individually. This is efficient for contractors who work with many GCs or property owners simultaneously.

Do I need an endorsement every time I start a new project?

Not necessarily if you have a Blanket Additional Insured endorsement in place. However, some contracts require scheduled (project-specific) endorsements naming the exact entity. Review each contract's insurance requirements carefully or ask your Morrow broker to review them.

What is the difference between an Additional Insured and a Certificate Holder?

A Certificate Holder is simply listed on the COI as a party that receives a copy — they have no additional rights under the policy. An Additional Insured is added by endorsement and has actual rights to make a claim under your policy for covered losses in which your operations are implicated. These are fundamentally different — never substitute one for the other.

Can a carrier refuse to issue a certain endorsement?

Yes. Carriers can decline to issue endorsements that create coverage they are unwilling to underwrite — for example, some carriers will not issue completed operations AI coverage for certain high-hazard trades. In that case, your broker can shop the coverage with carriers that will accommodate the requirement.

Why Morrow for Endorsements and Policy Changes

Independent agency with multiple carrier options. Morrow places commercial P&C coverage across a broad market of admitted and surplus lines carriers. If your current carrier won't issue a required endorsement, Morrow can remarketed the account to one that will — without you having to start over.
Fast COI and endorsement turnaround. Project schedules don't wait for slow certificate processing. Morrow prioritizes same-business-day turnaround on standard COI and endorsement requests, so you can mobilize on time.
Contract insurance requirement review. Morrow's brokers read subcontract and lease insurance requirement sections and flag gaps before they become a problem — not after a claim is denied.
Real claims advocacy. If an Additional Insured makes a claim under your policy, Morrow advocates for your interests throughout the process — coordinating with the carrier, reviewing coverage positions, and pushing back on improper denials.
Specialization in contractor and trades coverage. Additional Insured and Waiver of Subrogation requirements are the daily currency of the construction trades. Morrow brokers understand these requirements and the specific ISO form numbers carriers use, so nothing gets lost in translation.

Get Your Policy Endorsed Correctly

If a contract, landlord, or lender is asking for an endorsement you don't have — or you're not sure whether your current policy language meets what's required — Morrow can review your policy and issue the correct endorsement fast.

[Request a policy review or COI from Morrow →] (contact Morrow at [Morrow to confirm: website/phone])

Trust strip: Morrow (Afthonea Inc, DBA Morrow) is a licensed independent commercial P&C insurance agency. Licensed in [Morrow to confirm: states]. Carrier partners include [Morrow to confirm: carriers]. Rated [Morrow to confirm: review rating/platform].

Author: Content reviewed by a licensed P&C insurance professional with experience in commercial lines underwriting and broker operations. Published: June 2026 Last updated: June 2026

Sources: - Insurance Services Office (ISO) — Commercial Lines Policy Forms and Endorsements - Insurance Information Institute (III) — Understanding Your Insurance Policy - National Association of Insurance Commissioners (NAIC) — Consumer Insurance Glossary - ACORD — Certificate of Insurance (ACORD 25) Standards - State insurance department filed form databases (e.g., Oregon Division of Financial Regulation [verify state])