What to Include in a Subcontractor Insurance Requirement Letter

Insurance requirements usually live somewhere in the master subcontract, buried in a few paragraphs among dozens of other clauses. That's fine as a contractual matter, but it's not a practical way to get a subcontractor's insurance coordinator, who may never read the full subcontract, to actually produce the right certificate before mobilization. A short, standalone insurance requirement letter, sent early and separately, states exactly what's required and by when, in a format that's easy for whoever handles insurance on the subcontractor's side to act on directly. It doesn't replace the contract language. It makes the contract's requirements actually get acted on before the first day on site rather than being discovered as a problem after.

State plainly which types of coverage the subcontractor must carry. What's actually required varies by project and jurisdiction, but a typical letter lists coverage along these lines.

• Commercial general liability
• Workers' compensation and employer's liability, where the subcontractor has employees
• Automobile liability, if vehicles will be used in connection with the work
• Umbrella or excess liability, if the project or contract requires coverage above the underlying policy limits
• Any trade-specific coverage relevant to the scope, such as pollution liability for certain environmental or remediation work

For each coverage type, state the specific minimum limit required, both per occurrence and in the aggregate where applicable, rather than leaving limits to be inferred from "adequate coverage" or similar vague language. A subcontractor's broker needs an exact number to confirm against the subcontractor's actual policy, and a vague requirement is the most common reason a certificate comes back with limits that technically satisfy nobody's clear understanding of what was required.

If the general contractor, the owner, or other specified parties need to be named as additional insureds on the subcontractor's general liability policy, say so explicitly, and specify which parties by name. This is a frequent point of confusion: a subcontractor can hold a fully adequate general liability policy that simply doesn't name the GC as an additional insured, because nobody told their broker to add that endorsement. Additional insured status is only established by an actual endorsement to the policy, not by the certificate itself, a distinction state insurance regulators are explicit about (the Texas Department of Insurance's COI guidance notes a certificate "may not alter the terms and conditions" of the policy it reports on). Stating the requirement clearly, and asking for proof of the specific endorsement rather than just a general liability certificate, closes that gap.

State a firm date by which a current certificate of insurance, meeting every requirement above, must be received, and state it as a condition of the subcontractor being allowed to mobilize or begin work. Tying the deadline to mobilization, rather than leaving it open-ended, gives the requirement actual teeth: no current, compliant certificate means no start date, which is a much stronger incentive than a requirement with no consequence attached to missing it.

Specify exactly who should receive the certificate, by name or role, and how it should be delivered. A certificate that gets emailed to whoever happened to sign the subcontract, instead of to whoever is actually responsible for insurance tracking, is a common way for a valid certificate to exist without ever reaching the person who needs it on file.

Ask the subcontractor's broker to provide a renewed certificate automatically, or to notify you directly, a set number of days before the current policy period ends, rather than waiting for you to chase them down. Not every broker will commit to this, but stating it as a request, and separately tracking the expiration date on your own side regardless of whether the broker follows through, is a reasonable combination.

A simple outline of what such a letter might cover, for illustration only. This is a starting point to adapt, not finished contract language. Download a fillable letter template with placeholders for coverage amounts, dates, and contact details. Review it against your actual contract and have your attorney or broker check the language before sending it.

• Project name and the subcontractor's scope of work it applies to
• Required coverage types and minimum limits, listed line by line
• Additional insured requirement, naming the specific parties to be added
• Certificate delivery deadline, stated as a condition of mobilization
• Name and contact for where the certificate should be sent
• Request for advance notice of renewal or any change in coverage

What insurance a subcontractor is actually required to carry on a given project, and what language is enforceable in your jurisdiction, depends on the contract, the project, applicable law, and your own risk tolerance. This checklist is meant to help you organize a letter, not to serve as the letter itself. Have your attorney or insurance broker review the actual language before you send it, particularly the additional insured and indemnification wording, since small differences in that language can matter a great deal if a claim ever comes up.

The most common reason this letter fails to do its job isn't bad content, it's timing. Sent the week before mobilization, there's little room left to fix a gap if the subcontractor's actual coverage falls short of what's required, and you're left choosing between delaying the start date or letting the crew begin anyway while the broker scrambles to correct it. Sent at the time the subcontract is signed, well before any mobilization date is set, there's enough runway for the subcontractor's broker to add an endorsement, adjust a limit, or otherwise fix a shortfall without it ever becoming a schedule problem.

Sending the letter and getting a certificate back is the start of the work, not the end of it. For what to check on the certificate itself once it's in hand, and how to keep it current for the life of the project, see our guide to certificate of insurance tracking for general contractors. ConstruDo's permit and insurance reminders let you record the certificate's expiration date and get a scheduled reminder before it lapses, for every subcontractor across every project.