Most agents who work with contractors are very comfortable placing general liability coverage. It’s the foundation of almost every contractor account, and for good reason, as it handles the core exposures tied to bodily injury and property damage.

But there’s a growing area of risk that GL simply wasn’t designed to cover, and it’s starting to catch more contractors off guard. That exposure is design responsibility.

The challenge is that many contractors don’t think of themselves as taking on design risks. They’re not architects or engineers. But the reality is that the way projects are delivered today has blurred that line.

Building vs. Designing – Where is that Line?

Contractors are increasingly being asked to do more than just build. They’re selecting materials that must meet specific performance standards, providing shop drawings that include design elements, hiring specialty engineers and making changes to plans to save time or reduce costs. These decisions may feel like part of the normal construction process, but they often influence how a system functions, not just how it’s installed. That distinction is what creates the gap.

General liability policies are designed to respond when something is built incorrectly and causes bodily injury or property damage. What they typically exclude, however, are issues related to professional services, such as design errors, engineering decisions or performance failures.

So, when a loss stems from how something was designed rather than how it was installed, the GL policy often won’t respond.

A common example is a building envelope or window system that begins to leak. At first glance, it looks like a construction defect. But after further review, the issue turns out to be related to how the system was designed, maybe the drainage wasn’t adequate, or the specifications didn’t account for certain conditions. Even if the contractor installed everything correctly, they can still be pulled into the claim because of their role in selecting, coordinating, or taking responsibility for that system. And when the claim is tendered to the GL carrier, it may be denied as a professional services issue.

These situations are becoming more common. Project delivery methods such as design-build continue to grow, and owners are increasingly shifting responsibility downstream to contractors. At the same time, faster project timelines and tighter budgets are leading to more value engineering decisions and greater reliance on specialty trades to complete design components. All of this adds up to contractors taking on more professional risks, whether they realize it or not.

How Can Agents Protect Their Insureds?

For agents, the key is recognizing when a contractor has crossed that line. If an insured is involved in design-build work, delegated design (such as trusses, HVAC, or fire protection systems), making material or system selections based on performance, or hiring engineers to support their scope, there’s a strong chance they have a professional liability exposure.

One of the simplest ways to frame this for clients is: “Your GL policy covers you if you build something wrong. Contractors E&O covers you if something was designed wrong.” That distinction tends to resonate quickly.

Another helpful way to think about it is side by side:

At the end of the day, many contractors already have this exposure built into their operations. They just haven’t matched it with the right coverage. For agents, this creates a meaningful opportunity not just to round out an account but also to help clients avoid a type of claim that can be both unexpected and financially significant.