What is prototype
insurance?

A coverage question, not a separate product

There is no standard standalone product called prototype insurance. When a hardware startup, product designer, or inventor asks about prototype insurance, the coverage that usually answers is commercial general liability (CGL) insurance, and the question is whether the prototype is covered under it.

IRMI describes the CGL policy as coverage designed to protect a business against a wide range of liabilities, with bodily injury and property damage coverage at its center: claims that occur as a result of the business operations or premises, plus personal and advertising injury and products-completed operations.

A prototype is a pre-commercial product: a unit built to test a design, not yet released for sale. That status matters, because policies written for finished goods can exclude pre-commercial products, prototypes, and R&D units.

The finished-goods gap

Policies written for finished goods can exclude pre-commercial products, prototypes, and R&D units. A startup whose entire output is prototypes can hold a general liability policy whose products half excludes everything it makes. The certificate looks complete. The exclusion does its work at claim time.

Some forms remove coverage for any product not yet released for sale, and others define your products narrowly enough that a pilot unit on loan does not count as sold. If you loan, lease, or pilot hardware before you sell it, the definition of your product in the policy decides whether the products half is in play at all.

Before comparing premiums, the Risklytics guide advises asking three questions:

• Ask whether prototypes and pilot units fall inside the definition of your product in the policy
• Ask for the products-completed operations aggregate stated on the quote and on the certificate
• Ask for the exclusions page before you compare premiums

Products versus operations

General liability has two halves. Premises and operations responds to harm that happens while you are doing the work: a visitor tripping in your lab, a technician dropping a bracket onto a customer rack during an install. Products-completed operations responds to harm that happens after the work is done and the product has left your hands: the unit you shipped in March that catches fire in a customer warehouse in June, or the install you finished that fails a month later. Both halves sit on the same policy, each with its own aggregate limit.

The distinction matters because the two halves are underwritten differently. Premises and operations is priced on payroll and where your people work. Products-completed operations is priced on what you sell, how many units are in the field, and what they can do to a person or a building when they fail.

IRMI defines products-completed operations as one of the hazards ordinarily insured by a general liability policy, encompassing liability arising out of the insured products or business operations conducted away from the insured premises once those operations have been completed or abandoned.

A robot arm that pinches a hand two years after delivery, a battery pack that ignites on a customer bench, a lidar unit that a court decides was not eye-safe: these are products claims, and they arrive long after the sale. General liability is written on an occurrence basis, so the policy in force when the injury happens is the one that responds. Letting products coverage lapse between rounds leaves a gap that is hard to close later.

Demos and trade shows

A prototype running at a trade show is an operations exposure, and the venue will ask for a certificate before the booth opens, usually naming the organizer and the venue as additional insureds at $1M per occurrence. The unit has not been sold, so the products half is not in play, and a visitor who leans into a moving arm is a premises-and-operations claim on your policy.

Tell the underwriter about the show schedule. A policy that was told you build in a lab may treat the demo as a surprise.

Occurrence versus claims-made

Most CGL policies are written on an occurrence basis, and a claims-made form is also available. An occurrence form covers bodily injury or property damage that occurs during the policy period, regardless of when the claim is first made. IRMI defines a claims-made policy as coverage triggered when a claim is made against the insured during the policy period, regardless of when the wrongful act took place, subject to any retroactive date.

That distinction matters for prototypes, because injury from a unit can surface years after it was built, piloted, or sold. Under an occurrence form, the policy in force when the injury or damage occurs is the one that responds.

Defense costs

IRMI describes the financial implications of a lawsuit as potentially devastating for a business, and notes that CGL insurance safeguards against the high costs associated with legal defense, settlements, and judgments. IRMI defines duty to defend as an insurer obligation to provide an insured with a defense to claims made under a liability insurance policy, and notes it is generally broader than the duty to indemnify: the duty to defend may exist even where coverage is in doubt and ultimately does not apply. Some policies instead require only that the insurer reimburse the insured for funds spent defending a claim. Which arrangement applies is set in the policy wording.

What it does not cover

Several exclusions reach prototype work directly:

• Products still in development. Some forms remove coverage for any product not yet released for sale, and others define your products narrowly enough that a pilot unit on loan does not count as sold.
• Professional services. General liability excludes claims arising from professional services, and a carrier can argue that a unit misconfigured during your install was a professional error rather than a product failure. Technology errors and omissions insurance answers the professional side, and the two policies need wording that meets in the middle so a claim about a bad install has a home.
• Product recall. Recall costs, the notices, the return shipping, and the rework, are commonly excluded from general liability and sold as a separate recall coverage.
• Generative AI endorsements. The Risklytics guide, citing Independent Agent magazine, notes the standard-forms bureau filed generative AI exclusions for general liability effective January 2026, and one of them applies to the products-completed operations coverage part specifically. A hardware product with a model in the control loop can have its products coverage narrowed by that endorsement.
• Employee injuries. A CGL policy does not cover injuries to employees. Employee injuries are typically covered under workers compensation insurance.
• Intentional acts. CGL policies typically do not cover bodily injury or property damage resulting from intentional acts or misconduct by the insured.

The pattern is consistent: CGL covers third-party bodily injury and property damage from operations, premises, products, and completed work. Whether a prototype is inside that coverage depends on the policy definition of your product and on the exclusions page.