Impaired Property Exclusion
Also known as: Impaired Property Loss of Use Exclusion
The impaired property exclusion appears in the standard ISO commercial general liability policy and bars coverage for the loss of use of tangible property that has not been physically injured, where that loss of use results from the insured's product or work being defective, deficient, inadequate, or dangerous, or from a failure to fulfill the terms of a contract. In plain terms, if your faulty component makes someone else's larger product unusable but does not actually break it, the resulting economic loss is generally excluded. This reflects the long-standing principle that CGL is meant to insure accidental damage to third parties, not to guarantee the quality or performance of what the insured sells or builds.
For a small-business buyer, this matters because it defines the sharp line between an insurable liability claim and an uninsured business risk. If a machine shop supplies a bolt that is simply the wrong size, and an assembler has to shut down a production line until the bolt is swapped, the shutdown cost is loss of use of property that was never damaged — a classic impaired-property scenario the insurer will decline. This exclusion works alongside the your-work exclusion and the broader framework of products-completed operations coverage, all of which push warranty-type and workmanship costs back onto the business rather than the liability policy.
The critical nuance is the built-in exception: coverage is restored if the loss of use is caused by sudden and accidental physical injury to the product or work after it has been put to its intended use. So if that same defective bolt suddenly snaps during operation and physically damages the surrounding machine, you cross from impaired property into covered property damage territory. Buyers who provide critical components should review this exclusion carefully and, where warranted, negotiate manuscript endorsements or ensure their contracts allocate recall and rework costs, since the standard CGL will not fill that gap.
Real-world scenario
Precision Gearworks LLC, a 14-employee machine shop in Ohio, supplies custom gear assemblies to a conveyor-equipment manufacturer. Their general liability policy carries a $1,000,000 per-occurrence limit, a $2,000,000 general aggregate, and a separate $2,000,000 products-completed operations aggregate, with a $2,500 deductible and an annual premium of $6,800. A shipment of gear sets worth $45,000 arrived slightly out of spec on a tolerance, so the manufacturer refused to install them and shut down an assembly line rather than risk a failure.
The manufacturer demanded $320,000: $12,000 per day in lost production across 18 idle days ($216,000), plus $45,000 to source emergency replacement gears and $59,000 in expedited freight and overtime. Because the conveyor equipment itself was never physically damaged — it was simply unusable while it waited for conforming parts — the carrier applied the Impaired Property Exclusion. The $216,000 loss-of-use portion tied purely to Precision's defective product was excluded, dovetailing with the your-work exclusion and products-completed operations analysis.
The insurer still spent $28,000 defending the tender before denying indemnity, and Precision ultimately negotiated a $90,000 business settlement out of its own pocket to keep the account. Had a gear actually broken and gouged a $150,000 motor, that physical damage would have been covered up to the $1,000,000 limit — the exclusion only bites when the property is impaired, not wrecked.
How it affects your premium
The Impaired Property Exclusion is standard, unpriced language inside the ISO CGL form, so it does not carry its own charge — but the underwriting factors below drive how much loss-of-use exposure a policy leaves uncovered and how carriers price the surrounding products-completed operations risk:
- Type of product or component you make — parts that become integrated into a larger machine (gears, controllers, fasteners) generate more impaired-property disputes than standalone finished goods.
- Contractual damages you assume — if your contracts obligate you to pay a customer's downtime or consequential losses, that liability is exactly what this exclusion removes from coverage.
- Whether you carry broad-form property damage — a broad-form property damage grant can restore some loss-of-use coverage the base exclusion strips out.
- Products-completed operations aggregate limit — a higher aggregate signals more products exposure and shapes how tightly underwriters read the exclusion.
- Loss history on recalls and rework — prior claims for defective components elevate premium and scrutiny of your quality controls.
- Industry and revenue — manufacturers and contractors with high per-unit downtime consequences see the exclusion matter far more than low-stakes goods producers.
Common misconceptions
Myth: My general liability policy covers my customer's lost profits when my defective part shuts down their operation.
Reality:
It usually does not. The Impaired Property Exclusion specifically removes loss-of-use damages when your product or work is merely defective and the customer's property was never physically injured — a broad-form property damage endorsement may restore a narrow slice, but pure downtime claims are typically your own financial exposure.
Myth: The impaired property exclusion is the same thing as the your-work exclusion.
Reality:
They overlap but are distinct. The your-work exclusion bars the cost to repair or replace your own faulty work, while the impaired property exclusion bars loss-of-use damages to other property that is unusable because of your defective product or a broken contract promise.
Myth: If the exclusion applies, my insurer owes me nothing at all.
Reality:
Not necessarily. There is an important carve-back: if your defective product or work causes sudden, accidental physical damage to the impaired property, coverage can be restored — and the insurer may still owe a duty to defend the claim until the facts are sorted out.
Frequently asked questions
What exactly does the impaired property exclusion take away?
It excludes damages for the loss of use of tangible property that is not physically injured, when that loss arises because your product or CGL-covered work is defective, deficient, or fails to meet an agreed contract term. In plain terms: your customer's downtime and financial loss from a part that simply doesn't work right.
Is there any way to get coverage back after this exclusion?
Yes. The exclusion contains a built-in exception: if your defective product or work causes sudden and accidental physical injury to the property while it is being used, that resulting damage can be covered. Some insureds also add a broad-form property damage endorsement to widen the grant.
How is this different from the products-completed operations coverage I already pay for?
Your products-completed operations coverage handles bodily injury and physical property damage caused by your finished product. The impaired property exclusion sits inside that coverage and specifically strips out the pure loss-of-use and economic-loss piece.
Does buying more liability limit help with impaired property claims?
No. A higher per-occurrence or aggregate limit only helps for losses that are actually covered. If the Impaired Property Exclusion applies, the claim is excluded regardless of your limit — the fix is contract management and the right endorsements, not more limit.
Should a small parts manufacturer worry about this exclusion?
Yes, if your components get built into a larger machine or system. Manufacturers and contractors whose defective parts can idle a customer's operation face real, uninsured downtime exposure and should review their general liability wording with a broker.
Sources cited
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