What Is a COI?
A COI — certificate of insurance — is a one-page document issued by an insurance agent that summarizes a contractor's or vendor's active insurance coverage: policy types, limits, and expiration dates.
General contractors and property managers request a COI from every subcontractor and vendor before work starts — as proof they carry the minimum insurance required by the contract.
Updated May 2026 · 7 min read
COI meaning
COI stands for certificate of insurance. In construction and property management contexts it is also called a certificate of liability insurance, an ACORD certificate, or simply "the cert." All of these terms refer to the same document: the ACORD 25 form.
The certificate is not the insurance policy itself — it is a summary issued by the policyholder's agent. It tells you what coverage types are in place, what the limits are, and when each policy expires. It does not give you rights under the policy, and it does not guarantee the policy is still active on the day you look at it.
COI in a sentence: "Before we put them on site, send me their COI — I need to see at least $1M GL and workers' comp before they start."
What's on a certificate of insurance — the ACORD 25 form
The ACORD 25 is the standard certificate of insurance form used across the U.S. ACORD stands for Association for Cooperative Operations Research and Development — the nonprofit that produces the standardized forms used by the insurance industry. When someone says "send me your ACORD" or "send me your ACORD insurance certificate," they mean this form.
Producer & Insured
The top-left block identifies the producer — the insurance agent or broker who issued the certificate. The top-right identifies the named insured — the contractor or vendor who holds the policies. Confirm the named insured's legal business name matches exactly what's in your subcontract.
Coverages section
The middle of the form lists each active policy. Common coverage types:
- —Commercial General Liability (CGL) — covers bodily injury and property damage arising from the contractor's operations. Look for per-occurrence and general aggregate limits.
- —Workers' Compensation — covers the contractor's employees for on-the-job injuries. Statutory limits are required in most states.
- —Commercial Auto — covers vehicles used in the contractor's work. Important if subs are driving to and from your job site.
- —Umbrella / Excess Liability — provides additional limits above the underlying GL, auto, and employer's liability policies.
- —Professional Liability / E&O — covers errors and omissions; relevant for design-build contractors, engineers, and architects.
Description of Operations (Box 17)
This is the most important field on the form after the coverage limits. Box 17 is where additional insured language, primary and non-contributory provisions, waiver of subrogation, and project-specific notes appear. If your contract requires you to be named as additional insured, the language must appear here — not just in your subcontract. Learn the difference between certificate holder and additional insured →
Certificate Holder (bottom-left)
The entity listed here — typically the GC or property manager — receives the certificate and may receive cancellation notice. Being listed as certificate holder does not give you coverage rights. Who is the certificate holder on a COI →
Authorized Representative
The insurance agent or broker signs here. The certificate is issued by the agent — not by the insurance company. The signature confirms the agent attests to the policy information, but it is not a guarantee of coverage by the carrier.
What a COI proves — and what it doesn't
A certificate of insurance is frequently misunderstood as stronger evidence than it actually is. Knowing its limits is as important as knowing how to read one.
| A COI proves… | A COI does NOT prove… |
|---|---|
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The license gap: A contractor can hold a current COI and a suspended or revoked state license at the same time. The certificate says nothing about licensing status. To verify both, you need COI tracking for the insurance side and state database checks (TX TDLR, FL DBPR, CA CSLB, WA L&I, OR CCB) for the license side.
Who collects certificates of insurance — and why
General contractors
GCs collect COIs from every subcontractor before they start work on a project. This is typically required by the GC's contract with the project owner, their own insurance carrier during renewals, and sometimes by lenders financing the project. A GC managing 20–50 active subs can easily have 100+ certificates to track across multiple policy lines that renew at different times throughout the year.
Property managers and HOAs
Property managers collect COIs from every vendor providing services at managed properties — landscapers, HVAC technicians, plumbers, electricians, cleaning crews. For a portfolio of 10–50 properties with multiple vendors each, the certificate volume adds up quickly. An expired COI from a vendor who causes damage on-site can expose the property management company to liability it assumed was covered.
Project owners and developers
Owners on commercial and public projects often require GCs to provide certificates of insurance not just for themselves but for every sub on the project — with the owner named as additional insured on each. This flows compliance requirements down the contract chain.
COI in business — what it means outside construction
The term "COI in business" refers to the practice of requiring a certificate of insurance from any contractor, vendor, or service provider before they perform work at a company's premises or on its behalf. This applies broadly — not just in construction. Any business that hires outside parties for work that could cause injury or damage uses COIs to manage that risk.
In a construction context, the relationship is clear: GCs require COIs from subs because the sub's work on the job site creates exposure the GC could be held responsible for. In other business contexts, the logic is the same:
Commercial property owners
Require COIs from HVAC technicians, electricians, plumbers, and other tradespeople before they work in a commercial building — even for routine maintenance.
Manufacturers and distributors
Require COIs from equipment maintenance vendors, cleaning contractors, or logistics providers who work on-site, where an accident could halt operations or expose the business to liability.
Event venues and hospitality
Require COIs from caterers, A/V vendors, decorators, and other event suppliers who work on the property — because if one of their workers injures a guest, the venue is exposed.
Hospitals and healthcare facilities
Require COIs from medical equipment service vendors, facility maintenance contractors, and any other outside party working in a clinical environment where liability exposure is significant.
In every case, the COI serves the same purpose: documented confirmation that the outside party carries insurance that would respond if their work caused damage or injury. The ACORD 25 form is used across all of these contexts.
COI in real estate
In real estate, certificates of insurance appear in several distinct contexts — each with slightly different parties and purposes:
Property management
Property managers require COIs from every vendor performing work at managed properties — landscaping, HVAC, plumbing, electrical, janitorial. For a portfolio of 20 properties with 5 vendors each, that's 100+ certificates with staggered expiration dates to track. An expired COI from a vendor who causes damage can expose the property management company to liability it assumed was covered by the vendor's policy.
Commercial landlords and tenant buildouts
Commercial landlords typically require tenants to provide a COI — and a COI from any contractor performing the buildout — before construction begins in a leased space. The landlord is named as additional insured. This protects the landlord from liability arising from the tenant's contractor's work on the landlord's property.
HOAs and community associations
HOAs require COIs from vendors providing services to the community — pool maintenance, landscaping, common area repairs, security. Since HOA vendor relationships often run for years, certificate renewal tracking is a common pain point. HOA contractor compliance →
Real estate development
Developers require COIs from GCs, and GCs require COIs from every sub on the project — with the developer and owner named as additional insureds at each level. Complex projects can involve dozens of COIs across multiple tiers of contractors, each with their own coverage types and expiration dates.
How much does a certificate of insurance cost?
The certificate of insurance document itself is free. Requesting a COI from your insurance broker costs nothing — the broker issues it as part of managing your policy. The ACORD 25 form is generated at no charge, typically within a few hours for standard requests.
What costs money is the underlying insurance coverage that the COI summarizes. The cost of the insurance depends on the policy type, coverage limits, and the contractor's specific situation:
| Coverage type | Typical annual premium range | Key factors |
|---|---|---|
| General Liability ($1M) | $500–$5,000+/year | Trade type, revenue, prior claims |
| Workers' Compensation | 1%–6% of payroll | Trade classification, state, safety record |
| Commercial Auto | $1,500–$3,000+/vehicle/year | Vehicle type, driver history, mileage |
| Umbrella ($1M) | $300–$1,000+/year | Underlying policy limits, business type |
Ranges above are illustrative — actual premiums vary significantly by state, trade, claims history, and insurer. A roofing contractor pays substantially more for GL than a painter. A contractor in Florida or California may pay more than the same contractor in another state due to different underwriting risk. Get quotes from multiple carriers through a licensed broker.
How to get a certificate of insurance
You can't apply for a COI directly — the certificate is issued from an existing insurance policy. The sequence is:
Purchase the underlying insurance
Buy the coverage types your client requires — general liability, workers' comp, commercial auto — through a licensed insurance broker or agent. The COI is issued from these policies.
Give your broker the requester's details
When a client asks for a COI, provide your broker with: the certificate holder's name and mailing address, any additional insured requirements, coverage minimums to show, and any endorsement language (primary and noncontributory, waiver of subrogation, project name).
Broker issues the ACORD 25
The broker generates the completed ACORD 25 form and sends it — typically to you and/or the certificate holder — usually within a few hours for standard requests. Requests that require new endorsements (like adding additional insured language not already on the policy) may take longer if the insurer must approve the change.
If you're the one requesting a COI from a contractor: give them a written list of your requirements — coverage types, limits, endorsements needed, and your company name exactly as it should appear in the Certificate Holder box. The more complete your request, the fewer round-trips before you get a compliant certificate. How to request a COI from a subcontractor →
How to collect and track certificates of insurance
The collection workflow typically follows this sequence — whether done manually or through software:
Request
Before the sub starts work, send them your coverage requirements — minimum limits, required policy types, additional insured language, and your company name and address for the Certificate Holder field. The sub takes this to their insurance agent to have the certificate issued.
Review
When the COI arrives, verify the named insured, coverage types and limits, expiration dates, and Box 17 for additional insured language. Use the COI audit checklist →
Store
File the COI where it can be retrieved quickly — by subcontractor name, project, and expiration date. During owner audits, insurance renewals, or incident investigations, you need to be able to produce the right certificate in under a minute.
Monitor and renew
Track every expiration date across every policy line and every sub. Send renewal reminders at 90, 60, 30, and 7 days. When a policy renews, collect the updated certificate and re-verify it meets your current requirements. How COI tracking works →
Manual vs. software: For fewer than 10 subs, a spreadsheet is manageable. For larger rosters — or multiple active projects — COI tracking software automates collection via vendor upload links, reads the COI with AI so you don't enter data manually, and sends expiration alerts automatically. See how the two compare →
Frequently asked questions
What is a COI?
What does COI stand for?
What is the ACORD 25 form?
Does a COI guarantee active coverage?
How long is a COI valid?
Who issues a certificate of insurance?
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