Certificate of Insurance for Contractors: What It Proves

What a certificate of insurance proves — and what it cannot do

A certificate of insurance is a document that confirms a contractor has purchased certain types of coverage with certain limits. It provides evidence that general types of insurance coverages and limits have been purchased by the party required to furnish it.

That is all it does.

The certificate is issued as information only. It confers no rights on the certificate holder and does not amend, extend, or alter the coverage afforded by the policies listed on it. New York's Department of Financial Services states the same thing: an agent may not add terms to a certificate that alter, expand, or otherwise modify the policy.

This distinction matters every time a hiring party asks for "proof of insurance." The certificate proves coverage exists. It does not create coverage that the policy does not already provide.

When a certificate alone satisfies the request

Some certificate requests are simple. A landlord wants to see that you carry general liability before signing a lease. A residential customer wants to confirm you are insured before the job starts. In those cases, the standard certificate with the right limits and dates may be all you need.

But when the contract includes insurance clauses — additional insured requirements, waiver of subrogation, primary and noncontributory wording, completed operations coverage, or umbrella limits — the certificate alone will not satisfy the requirement. The policy must support each requirement through endorsements or blanket wording.

How to read a contractor certificate of insurance

A standard ACORD 25 certificate has a fixed layout. Knowing what each field means helps you compare the certificate against your contract before sending it to the hiring party.

Certificate holder vs additional insured

These are not the same thing. A certificate holder receives the certificate as information. An additional insured has actual coverage rights under the contractor's policy for claims arising from the contractor's work.

Wellesley's certificate-review guidance states directly: additional insured status is conveyed by endorsement, not by the certificate alone. If the contract says "name us as additional insured," the policy must be endorsed. The certificate confirms the endorsement exists.

Endorsements your contract probably requires beyond the COI

When a contract says "provide a certificate of insurance," the actual insurance requirements usually include several endorsements the certificate alone cannot satisfy. Public contract examples from Caltrans, Chicago, Port St. Lucie, and New York OGS all require endorsements in addition to the certificate.

Select your contract or buyer type below to see which endorsements that type of job typically requires.

Additional insured: what it means

An additional insured endorsement extends the contractor's GL coverage to the hiring party for claims arising from the contractor's work. IRMI explains that indemnification and additional insured coverage are separate risk transfer mechanisms — a contract may require both.

Caltrans requires additional insured endorsements for both ongoing operations and completed operations. Chicago requires additional insured status for the City with respect to work performed on its behalf. Port St. Lucie requires an additional insured endorsement attached to the certificate.

Some policies include blanket additional insured wording — a single endorsement that automatically names every party who requires it under a written contract. Others require scheduled endorsements naming each party individually. Ask your agent which form your policy uses.

Waiver of subrogation

A waiver of subrogation means the insurance company agrees not to recover from the hiring party after paying a claim on the contractor's behalf. Contracts require it so the hiring party is not sued by the contractor's insurer after a covered loss.

Caltrans requires a waiver of subrogation endorsement for workers compensation. Port St. Lucie requires it for both workers comp and GL. New York OGS asks for waiver of subrogation language in favor of the additional insureds.

Primary and noncontributory

Primary and noncontributory means the contractor's policy pays first and does not seek contribution from the hiring party's own insurance. Chicago states the contractor's liability insurance must be primary without right of contribution by any other insurance maintained by or available to the City.

New York OGS allows this statement either in the certificate description of operations or on a submitted endorsement. Some buyers accept the description-of-operations reference. Others require the endorsement copy. Check the contract language.

Completed operations

Completed operations coverage applies to claims that arise after the job is finished. Chicago requires products and completed operations coverage for at least two years following project completion. Caltrans requires additional insured endorsements covering both ongoing and completed operations.

If the contract names specific endorsement forms for ongoing and completed operations, ask your agent whether the policy can provide the required wording before you send the certificate.

Limit requirements by contract size and buyer type

Contract insurance requirements vary by buyer and project size. Public-works contracts often require higher limits than private residential work. These are real public-contract examples showing what hiring parties ask for.

Contracts often list separate requirements for commercial auto insurance, workers compensation insurance, and commercial umbrella insurance. A certificate can show each line only when the policy is active and the limits meet the contract.

How limits scale with contract amount

Caltrans ties required GL and umbrella limits directly to contract amount. The lowest listed tier requires $5,000,000 in umbrella or excess liability. Contracts over $25,000,000 require $25,000,000 in umbrella or excess.

If your current GL policy carries $1M/$2M limits and the contract requires $5M umbrella, you need an umbrella or excess liability policy before you can issue a compliant certificate. Your certificate can show umbrella limits only if you actually carry that policy.

When umbrella or excess liability is required

Chicago requires umbrella or excess liability of not less than $5,000,000 per occurrence, following form over the underlying GL, auto, and employers liability. Most GC subcontracts for commercial work also require umbrella limits above the base GL policy.

If you do not currently carry umbrella coverage and a contract requires it, you need a quote before you can promise compliance. The marketplace can compare contractor insurance options including umbrella from carriers that write your trade.

Workers comp proof when you have no employees

If you work alone and a GC or project owner asks for workers compensation proof, you are not necessarily required to buy a policy. But you do need to respond correctly.

Many hiring parties require WC proof from every contractor on the job, regardless of employee count. Their concern is that an uninsured contractor injured on site could file a claim against the hiring party's own policy.

Exemption forms and state affidavits

Most states allow sole proprietors or single-member LLCs to file a workers compensation exemption. The exemption form or affidavit confirms you are not required to carry WC under state law. Some hiring parties accept the exemption form in place of a WC certificate.

Others will not. Some GCs require every sub to carry WC regardless of state exemption rules. Their contract language overrides the state minimum. If the contract says "workers compensation required" without an exemption clause, you may need to buy a policy or decline the job.

Public contract WC requirements

Chicago requires workers compensation as prescribed by applicable law, covering all employees who provide service under the agreement, with employers liability limits of $1,000,000 each accident. Port St. Lucie requires workers compensation in accordance with Florida law with employers liability limits of $100,000 each accident.

Red flags that get a certificate rejected

Before you send a certificate, check it against these common rejection reasons. A rejected COI delays the job start and may require a policy change before you can resubmit.

Wellesley's certificate-review guidance warns that old or missing dates may signal a forged certificate. New York DFS guidance confirms that a certificate cannot expand or alter the policy — so wording typed onto the certificate that the policy does not support is a compliance gap, not a coverage solution.

Use the checklist generator below to create a written list of what your contract requires. Use it when you request certificates and endorsements so the certificate can match the contract the first time.

Get the right coverage and a compliant certificate fast

Most contractors need coverage and a certificate before a job starts. The longer it takes to get the right endorsements and limits in place, the longer the job is delayed.

Submit one quick form. The marketplace compares your account with carriers that insure contractor work for your work type, payroll, state, and contract requirements. Licensed insurance professionals can review the endorsement requirements and help you compare what the contract asks for against what the policy provides.

The marketplace compares your account with carrier options that may fit your work type, state, payroll, and endorsement requirements. Licensed insurance professionals can help you review the options and check whether the coverage lines up with what your contract asks for.