Two parties have a stake in subcontractor insurance: the sub who needs to carry it, and the GC who needs to verify it. When coverage is missing, both can end up paying.
Here's how it plays out. A sub causes damage or injures someone on site, carries no general liability insurance, and the GC's own policy gets pulled into the claim. Many contractor policies carry a subcontractor warranty endorsement, which cuts back that coverage when the sub didn't hold its own insurance at the required limits, so the insurer pushes back. The GC absorbs the cost, the project stalls, and the client's trust takes a hit. This guide covers what subs are required to carry, what GCs should be requiring by contract, and what actually happens when a sub shows up uninsured.
Do Subcontractors Need Their Own Insurance?
In most cases, yes, for two distinct reasons: legal requirements and contractual requirements.
On the legal side, some trades require insurance to obtain a license in the first place. Electrical contractors, plumbers, and HVAC technicians in many states must carry general liability coverage before a licensing board will issue a license, and workers compensation once they have employees. Requirements vary by state, so check with your state's licensing authority for specifics.
On the contractual side, most GCs require proof of insurance regardless of what state law mandates. This is not just a formality. A GC's commercial general liability policy does respond to claims arising from a sub's work, since the standard form defines "your work" to include operations performed on the insured's behalf. But many contractor policies add a subcontractor warranty or independent contractor endorsement that cuts back or removes that coverage when the sub doesn't carry its own insurance at the required limits. If a sub causes a loss and has no insurance, the GC may be left holding the liability. That's why most experienced GCs treat insurance verification as a non-negotiable before a sub touches the project.
Core Coverage Requirements for Subcontractors
The specific coverage a sub needs depends on the trade, the project type, and the contract terms. Here's what the standard requirements look like across the main policy types:
| Coverage | What it covers | Typical minimum limit | Who requires it |
|---|---|---|---|
| General liability | Third-party bodily injury and property damage from the sub's work | $1M per occurrence / $2M aggregate | GCs, state licensing boards, clients |
| Workers compensation | Injuries to the sub's own employees | Statutory limits (varies by state) | Required in every state except Texas, usually from the first employee in construction |
| Commercial auto | Vehicles operated on site or transporting materials | $1M combined single limit | GCs, contract terms |
| Professional liability (E&O) | Errors in design, calculations, or technical recommendations | $1M | Design-build subs, engineers, specialist consultants |
| Tools and equipment | Theft or damage to the sub's own tools and gear | Replacement value of equipment | Lenders, equipment rental agreements, and many subcontracts |
A note on workers compensation: it's required for any sub with employees in every state except Texas, and construction is commonly carved out of the small-employer thresholds that apply to other industries. Most GCs won't hire a sub without it. An uninsured sub's workplace injury doesn't just affect the sub. It commonly lands on the GC, whose own workers comp policy gets pulled in to cover a worker it never hired.
A note on additional insured status: the large majority of GC contracts require subs to add the GC as an additional insured on their GL policy. This extends the sub's coverage to the GC for claims arising from the sub's work. It's a standard requirement, not an optional extra, and it should be confirmed in writing before work begins.
The SBA's surety bond guarantee program is also worth reviewing for subs working on public contracts. The Miller Act puts performance and payment bonds on the prime contractor rather than the sub, but GCs often require subcontractor bonds by contract, and the SBA guarantee covers bonds on subcontracts too.
What GCs Should Require From Every Subcontractor
Before a sub sets foot on site, GCs should have three things in hand: a certificate of insurance naming the GC as additional insured, confirmation of active workers compensation coverage (or a signed exemption where state law permits), and policy limits that match the scale and risk profile of the project.
Recommended minimum limits by trade:
| Trade type | Recommended GL minimum | Notes |
|---|---|---|
| Lower-hazard trades (drywall, painting, finish carpentry) | $1M per occurrence | Workers comp and auto required alongside |
| Higher-hazard trades (roofing, framing, excavation) | $2M per occurrence | Highest injury frequency and fall exposure |
| Electrical, plumbing, mechanical | $2M per occurrence | Lower injury rates, but severe fire and water damage tails |
| Design-build or engineering subs | $1M GL plus $1M E&O | Professional liability required for any scope involving plans or calculations |
One thing GCs consistently underestimate: a COI in the file is not the same as active coverage. A certificate reflects the policy as it stood on the date it was issued. Policies lapse, get cancelled, and expire. If a sub's coverage runs out mid-project and an incident happens, that COI is worthless. Verify before work starts, note the renewal dates, and re-check on longer projects.
What Happens if a Subcontractor Has No Insurance?
This is where the exposure gets real, and it hits the GC harder than most expect.
Under OSHA's multi-employer citation policy, the GC is generally treated as the controlling employer on site, which means it can be cited for hazards created by a subcontractor where it had the authority to correct them. That means safety failures by an uninsured sub don't just create civil liability exposure. They can trigger regulatory consequences for the GC too.
On the insurance side, the scenarios that cause the most damage are:
Property damage caused by an uninsured sub. The sub has no policy to respond to. The GC's insurer reviews the claim and checks whether the sub met the policy's subcontractor insurance warranty. The GC either fights the denial or absorbs the cost out of pocket.
An uninsured sub's employee gets injured on site. Workers compensation would normally handle this, but the sub has none. In most states the GC is then treated as the statutory employer, which means its own workers comp policy pays the claim and absorbs the loss history. Where that status doesn't apply, the injured worker's options are limited enough that they may sue the GC directly. Either way the cost lands on the GC.
Audit exposure at the end of the term. This one catches GCs off guard. At the end of each policy period the carrier audits payroll and subcontractor spend. Properly insured subs are rated on the cost of the subcontracted work. Uninsured subs get charged at the GC's own trade rate on the sub's labor, as if they had been the GC's employees. The more uninsured sub work during the period, the larger the additional premium bill when the audit lands.
The pattern is consistent: uninsured subs seem fine until something happens. At that point, the GC absorbs the cost, the coverage dispute, and the project delay. Requiring proof of insurance before work starts costs nothing. Not requiring it can cost a lot.