How Much Does It Cost to Add an Additional Insured?

Adding an additional insured to a commercial insurance policy typically costs $0 to $150 per endorsement, depending on the carrier, policy type, and how many parties are added. Many general liability policies include blanket additional insured endorsements with no per-party charge. Who this is for: contractors, vendors, tenants, and any business required by contract to add a client, landlord, or project owner as an additional insured.

TL;DR / Key Takeaways

• Most additional insured endorsements cost $0–$150 per named party; blanket endorsements cover all qualifying parties under one flat charge, often already baked into the base premium.
• The endorsement extends your liability coverage to protect the third party — it does not reduce your own limits.
• Adding an additional insured is not the same as issuing a certificate of insurance (COI); the endorsement changes the policy, while the COI merely evidences it.
• Scheduled (named) endorsements are slower and costlier; blanket endorsements are faster and more common for active contractors.
• Costs vary by line: general liability endorsements are cheapest, while commercial auto and umbrella additional insured riders may carry higher fees.

What Does "Additional Insured" Actually Mean?

An additional insured is a person or organization — typically a general contractor, property owner, or client — added to your policy so that your liability coverage also defends and indemnifies them for claims arising from your work or operations. The coverage flows from your policy, not theirs. Their own limits remain separate.

Key distinctions that affect cost and scope:

How Much Does It Cost to Add an Additional Insured? (By Policy Type)

Cost varies significantly by line of coverage:

Rates above are illustrative industry ranges as of mid-2026. Your actual premium will depend on carrier, state, class code, payroll/revenue base, and loss history.

Blanket vs. Scheduled Additional Insured: Which Costs Less?

Blanket additional insured endorsements automatically extend coverage to any party that qualifies under a written contract with the named insured. You pay one flat endorsement charge (or it's included at no extra cost) and every qualifying GC, property owner, or client is covered without a separate certificate request.

Scheduled (named) additional insured endorsements list each party by name. Each new party requires a policy endorsement, which takes insurer processing time (24–72 hours) and may carry a per-party charge.

For active contractors working with multiple clients or GCs, blanket endorsements save time and often money. For businesses with one or two long-term partners, scheduled endorsements may be sufficient.

Does Adding an Additional Insured Raise My Premium?

In most cases, adding an individual additional insured via a blanket endorsement does not raise your renewal premium. However:

• Completed operations additional insured coverage (ISO CG 20 37) can add meaningful cost — often $50–$300 per policy period — because it extends liability coverage for claims arising after your work is finished.
• Primary and non-contributory (P&NC) language, often required alongside additional insured status, can modestly increase premium (5–15% in some markets) because it changes the order of coverage when the additional insured has their own policy.
• Adding many scheduled parties over a policy period can trigger a mid-term premium adjustment, especially on smaller policies.

How to Add an Additional Insured in 5 Steps

1. Review the contract requirement. Identify what the contract demands: ongoing operations only, completed operations, primary and non-contributory language, specific ISO form numbers (e.g., CG 20 10 11 85), or a minimum limit.
2. Contact your broker. Send your broker the contract language or the certificate request. A good broker will confirm the endorsement matches what is required before issuing anything.
3. Confirm your policy has the right endorsement. Your broker requests the endorsement from the carrier. For blanket AI policies, this may already be in place; for scheduled, a new endorsement is issued.
4. Receive the updated certificate of insurance (COI). Once the endorsement is bound or confirmed, your broker issues a ACORD 25 certificate listing the additional insured in the Description box and confirming additional insured status.
5. Deliver the COI to the requesting party. Send the certificate (and endorsement copy if required) to the GC, property owner, or client before work begins. Some contracts require the certificate within 10 days of contract execution.

Total time from request to COI delivery: same day to 3 business days, depending on carrier and whether the endorsement is blanket or scheduled.

Real-World Example: Electrical Subcontractor in Texas

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

A licensed electrical subcontractor based in Austin, TX has a $1M/$2M commercial general liability policy with a blanket additional insured endorsement and completed operations coverage. Annual CGL premium: $4,200.

The general contractor on a commercial build-out requires the sub to: - List the GC and the property owner as additional insureds (ongoing and completed operations) - Provide primary and non-contributory language - Issue a certificate within 5 business days of contract execution

Because the policy already includes a blanket AI endorsement (ISO CG 20 10 / CG 20 37 equivalent) and P&NC language, no additional charge is assessed. The broker issues the ACORD 25 certificate the same afternoon the request is received.

Had this been a scheduled endorsement policy without P&NC language, the carrier might have charged $75–$150 to add the two parties and a mid-term endorsement fee of $25 to update the policy. The sub also would have waited 1–3 business days for the carrier to process the change.

Takeaway: Blanket AI endorsements are standard practice in Texas commercial construction and typically included at no per-party cost in a well-structured CGL policy for active subcontractors.

Frequently Asked Questions

Does it cost money to add an additional insured? Usually $0–$150 per party, depending on carrier and policy type. Many commercial general liability policies include a blanket additional insured endorsement where the cost is already factored into the base premium, making each individual addition free at the time of the request.

How long does it take to add an additional insured? With a blanket AI endorsement already on the policy, a COI can be issued the same day — sometimes within the hour. Scheduled (named) endorsements take 24–72 business hours for carrier processing. Using a broker with direct carrier access speeds this up significantly.

Is an additional insured the same as a certificate holder? No. A certificate holder is simply listed on the COI for notification purposes; they have no rights under the policy. An additional insured is actually added to the policy via endorsement and can make a claim under your coverage if they are sued for something arising from your work.

Can I add an additional insured to my workers compensation policy? No. Workers compensation policies cover your employees' injuries under a statutory framework and do not support additional insured endorsements. Parties with labor-related concerns on a project are typically protected through contractual indemnification, not WC endorsements.

What is "primary and non-contributory" and does it cost extra? Primary and non-contributory (P&NC) language means your policy pays first, before the additional insured's own liability policy contributes. Many contracts require it alongside additional insured status. Some carriers include P&NC in their blanket AI endorsement; others charge a modest separate premium (typically 5–15% of CGL premium in competitive markets).

Can a general contractor require a specific ISO form for additional insured status? Yes, and this matters. Some older contracts reference ISO CG 20 10 11 85, which provided broader coverage than current forms. Carriers may not offer this exact form today. Your broker should review the contractual requirement against what your carrier can actually provide and flag any gaps before you sign the contract.

Do I need to add an additional insured on my umbrella policy too? Often yes. If the contract requires your umbrella or excess policy to follow form to the underlying CGL with respect to additional insured status, you may need a separate AI endorsement on the umbrella. Most umbrella carriers offer this; cost ranges from $0 to $150 per policy period.

What happens if I forget to add an additional insured before a loss? If the additional insured status was contractually required but not endorsed onto the policy before the incident, the third party has no coverage under your policy. This can expose you to breach of contract claims and leave the GC or property owner unprotected — a significant liability for your business relationship and finances.

Why Morrow for Additional Insured Endorsements

1. Independent agency access to multiple carriers. Morrow places commercial P&C coverage with a curated panel of admitted and surplus lines carriers [Morrow to confirm carrier list]. That means we can shop for policies that already include blanket AI endorsements at no per-party charge — rather than policies that nickel-and-dime you for every certificate request.

2. Same-day COI and endorsement turnaround. For clients with blanket AI endorsements in place, Morrow issues certificates the same business day — often within the hour for standard requests. We maintain digital access to carrier systems so you are never waiting on paper.

3. Trade and construction specialization. We understand the certificate-of-insurance workflows that GCs, property owners, and municipalities require. We know the difference between CG 20 10 and CG 20 37, what "primary and non-contributory" means in a subcontract, and how to structure your policy before you ever sign a contract — not after.

4. Contract review before you bind. Before you sign an agreement with tough insurance requirements, Morrow can review the insurance specifications and confirm your current policy meets them — or identify gaps so you can negotiate or fill them before they become a problem.

5. Real claims advocacy. If a claim is filed against you or an additional insured on your policy, Morrow advocates with the carrier on your behalf. We don't disappear after the sale.

Get a Quote or Add an Additional Insured Today

Already a Morrow client? Request a certificate or additional insured endorsement here — most requests are fulfilled same business day.

New to Morrow? Get a commercial insurance quote and let us review your current policy for blanket AI coverage, completed operations gaps, and P&NC language before your next contract requires it.

Trust strip: Morrow (Afthonea Inc, DBA Morrow) is a licensed independent commercial insurance agency [Morrow to confirm licensed states and NPN]. We work with admitted and surplus lines carriers rated A- or better by AM Best. [Morrow to confirm carrier panel and review platform link.]

Related Resources

• Additional Insured Endorsement Explained — What it is, how it works, and what forms to know
• How Much Does Commercial General Liability Insurance Cost? — Full cost guide by trade and revenue
• Certificate of Insurance (COI): What It Is and What It Covers — COI vs. endorsement, who needs one, and how to read it
• Waiver of Subrogation: Cost and When You Need It — Often required alongside additional insured status
• Commercial Insurance for Contractors — Policy structures for subs, GCs, and specialty trades

Author: Sarah Whitfield, CPCU, CIC — Commercial Lines Coverage Specialist with 14 years in P&C insurance brokerage, specializing in construction and contractor programs.

Published: June 2026 | Last updated: June 2026

Sources: - Insurance Services Office (ISO) — CG 20 10 and CG 20 37 endorsement form language - Insurance Information Institute (III) — Commercial liability coverage fundamentals - National Association of Insurance Commissioners (NAIC) — Policy form filing guidance - ACORD — Certificate of Insurance (ACORD 25) standards - State insurance department filings (varies by state) — Endorsement approval and form availability