Your concrete clients — the general contractors, developers, and project owners you work for — largely dictate the insurance you have to carry, and they enforce it before you ever pour. The typical package is consistent across the trade: general liability at specified limits with the client named as an additional insured for both ongoing and completed operations, commercial auto on the trucks, workers compensation for the crew, and often an umbrella above the primary layers — all evidenced by a certificate of insurance before you are allowed on site. This is general education about what clients usually require, not legal advice or a reading of your specific contracts.
The reason this matters operationally is that a mismatch between what a contract demands and what your policy actually carries does not surface conveniently. It surfaces when a general contractor’s certificate desk rejects your certificate and holds up the job, or worse, when a claim reveals that the additional-insured protection the contract assumed was never on the policy. Understanding what clients require — and why — is how you keep a certificate request from becoming a problem under deadline.
Why your clients dictate your insurance
A general contractor or project owner who lets a concrete sub on site is taking on the risk that your work, your crew, or your trucks cause harm on their project. Their contract manages that risk by pushing it back to you and requiring proof that you carry the coverage to answer for it. This is standard construction practice, not an imposition unique to concrete: the party with the exposure requires the party creating it to insure it and to extend that insurance to protect them.
For a concrete sub the requirements cluster around the exposures the trade actually carries — the work you leave behind, the trucks you run, and the crew you employ — which is why the package a GC demands maps closely onto the coverage lines a concrete business should carry anyway. The contract is not asking for exotic coverage; it is asking you to carry, and to share, the coverage the work needs.
General liability with additional-insured status
The center of almost every requirement is general liability, and the piece that trips up subs is not the policy itself but the additional-insured status the contract demands on it. Naming the general contractor, developer, or owner as an additional insured extends your general liability to protect them for liability arising out of your work — the protection they are requiring in exchange for letting you on the job.
In ISO’s system this is typically handled with two endorsements, and a well-drafted contract often requires both. CG 20 10 adds the client as an additional insured for your ongoing operations — the protection they want while your crews are on site and the work is underway. CG 20 37 extends that additional-insured status to your completed operations — the protection they want after your concrete work is finished. These are real, standard endorsements, and naming them precisely matters because a contract that requires “additional insured including completed operations” is asking specifically for the second one, not only the first. Many policies can add these on a blanket basis — additional-insured status “where a written contract requires it” — rather than scheduling each general contractor by name, which is far more practical for a sub bidding multiple jobs. Whether your policy carries blanket wording, whether it includes the completed-operations endorsement, and at what limits, all depend on the endorsements actually attached. For the mechanics of how additional-insured status works, see what additional insured means.
The completed-operations requirement on installed concrete
The completed-operations piece deserves its own emphasis, because it is where concrete differs from many trades and where clients are most specific. Installed concrete keeps existing and keeps carrying risk long after the pour — a slab, footing, driveway, or foundation can fail downstream, months or years later, and cause third-party injury or property damage. A general contractor knows this, which is why they want additional-insured status that reaches the completed work and not only the period while you were on site.
That is exactly what the CG 20 37 completed-operations endorsement is for, and it is why a knowledgeable GC will require it alongside the ongoing-operations endorsement rather than settling for CG 20 10 alone. The requirement matches the real exposure of the trade: the completed-operations tail is precisely where a concrete claim tends to surface. For a fuller explanation of the exposure itself, see what completed operations means. The practical takeaway for a sub is that “additional insured” on a concrete contract almost always means both endorsements, and a policy that carries only ongoing-operations status will fail a careful certificate review.
Commercial auto for the trucks
Because a concrete operation runs trucks — work trucks on the install side, a high-value boom pump truck, or a ready-mix mixer fleet — clients also require commercial auto at specified limits. The general contractor wants auto liability behind your vehicles both on the road and while they maneuver on the client’s site, and some contracts also ask for the client to be named on the auto policy or for a waiver of subrogation. The limits demanded scale with the project and the client, and a larger or public project often sets a higher bar than a small private one. As with general liability, whether your auto policy meets a given requirement depends on how it is written, which is why the requirement is worth reading against the actual policy rather than assumed.
Workers compensation and the umbrella
Two more lines round out the typical package. Workers compensation is required wherever you have employees — most states mandate it, and a general contractor does not want your injured worker becoming their liability, so they will ask for a certificate showing it in force and sometimes a waiver of subrogation in their favor. And because the primary general liability and auto limits are finite, many contracts require an umbrella or excess policy sitting above them, especially on larger projects where the client demands total limits higher than a primary policy carries on its own. The umbrella is how a sub meets a high total-limit requirement without rewriting the underlying policies. Some clients also expect commercial property or equipment coverage where you store materials or equipment on their site, though this varies more by project.
The certificate of insurance as proof
All of these requirements are enforced through one document: the certificate of insurance, or COI. It is a one-page summary that evidences the policies you carry — the coverage lines, the limits, the effective dates, and any additional-insured or waiver status — issued by your agent or carrier to your client. Most general contractors will not release a contract or a payment until a compliant certificate is on file, and many will also request copies of the additional-insured endorsements themselves to confirm the certificate reflects real coverage.
The critical point is that the certificate does not create coverage — it reports it. A certificate that names additional-insured status or completed-operations coverage the policy does not actually carry is a problem waiting to surface at a claim, when the protection the contract assumed turns out not to be there. That is why the endorsements behind the certificate have to be genuinely on the policy, and why matching the certificate to the contract is a coverage question, not a paperwork one.
Reading the contract against your policy
The single most useful habit a concrete sub can build is to read the insurance requirements in a contract against the actual policy before signing or starting — not after a certificate request lands under deadline. The requirements to check are consistent: the general liability limits and the additional-insured endorsements including completed operations, the commercial auto limits and any additional-insured or waiver on auto, the workers compensation and any waiver of subrogation, and any umbrella or total-limit requirement. Where the policy falls short, it can usually be adjusted — but only if the gap is caught before the job rather than during a claim.
Real-World Scenario: A concrete sub wins a spot on a commercial project and signs the subcontract without reading the insurance exhibit closely. Weeks later, the general contractor’s certificate desk rejects the sub’s certificate: the contract required additional-insured status for completed operations, and the sub’s policy carried only the ongoing-operations endorsement. The crew is ready to pour, but the GC will not release them to the site until the certificate is compliant, and correcting the endorsement takes days the schedule did not have. A sub whose agent had read the contract against the policy before signing would have added the completed-operations endorsement up front and started on time. Same coverage gap, two very different outcomes — the difference was catching it before the job instead of at the gate.
Getting the coverage to match what your clients demand
What your concrete clients require is not mysterious, but it is specific, and the details — completed-operations additional-insured status, the right limits, the umbrella above the primary layers, the waivers a particular contract names — are where a job stalls or a claim finds a gap. This is general education about the typical requirements, not a reading of your specific contracts; your agent, and where the wording carries legal weight an attorney, are who match your policy to what a contract actually demands. When you want an agent who writes the class to read your contracts against your policy before you bind, start a quote, or browse the rest of our coverage and owner resources as the library grows.