What Is an Exclusion in a Car Insurance Policy?
Reviewed by the Skyview Auto Glass technical team — NWRD-, ASE- and DINITROL-trained technicians · Updated November 2026
Quick answer
An exclusion is a condition the policy does not cover. Exclusions that touch glass include wear and tear, pitting, pre-existing damage, and mechanical failure such as a window motor. A sudden event like a rock or a storm is usually covered under comprehensive. What is excluded depends on your policy, so read it and confirm with your insurer or agent.
What is an exclusion in car insurance?
An exclusion is a specific condition or cause of loss that the policy does not cover. Every policy lists them, and they draw the line between a covered loss and one the driver pays for. For glass, the exclusions that matter most are wear and tear, gradual deterioration, pre-existing damage, and mechanical or electrical failure.
Wear and tear is the common one. A windshield that has pitted over years of sand and grit, or a seal that has aged and shrunk, is gradual deterioration rather than a sudden loss, so comprehensive coverage generally does not pay for it. A rock chip or a hail crack, by contrast, is a sudden event and is usually covered. See our guide on whether pitting is covered.
Mechanical failure is excluded too. A window motor that burns out or a regulator that fails is a mechanical or electrical problem, not glass damage, and it is not part of a comprehensive glass claim. Read the policy to see what is excluded and confirm with your insurer or agent.
What is not covered by comprehensive
The line between a covered loss and an exclusion usually comes down to whether the damage was sudden or gradual.
| Cause | Usually covered? | Why |
|---|---|---|
| Rock chip from road debris | Yes | A sudden event, not an exclusion |
| Hail crack or falling limb | Yes | A sudden event, not an exclusion |
| Windshield pitting from years of sand | Generally no | Gradual wear and tear |
| A worn, leaking seal | Generally no | Wear or workmanship, not a loss |
| A failed window motor | No | Mechanical failure, not glass damage |
What your policy excludes sets what applies, so confirm the details with your insurer or agent.
Common myths about exclusions
Comprehensive covers any glass problem.
It covers sudden losses like rocks and storms. Wear, pitting, aged seals, and mechanical failure are typically excluded as wear and tear or mechanical breakdown.
A crack that was there when I bought the car is covered.
Pre-existing damage is generally excluded. Insurance covers losses that happen while the policy is in force, not damage that predates it.
A failed window motor is a glass claim.
A motor or regulator failure is mechanical or electrical, not glass damage, and it is not part of a comprehensive glass claim.
More questions about exclusions
What does comprehensive car insurance exclude?
Wear and tear, gradual deterioration, pre-existing damage, and mechanical or electrical failure are typically excluded. Sudden events like rock chips, hail, and break-ins are usually covered. Read your policy and confirm with your insurer or agent.
Is a worn windshield seal covered?
Generally no. A seal that has aged or shrunk is wear and tear, not a covered loss. The route is a reseal paid out of pocket or the installer’s warranty. See our guide on a leaking windshield.
Is pre-existing damage covered?
No. Coverage applies only to losses that happen once the policy is in force. Damage that predates the policy is excluded, so a crack that was there before the policy started is not a covered loss.
Related guides
More in Insurance and claims
- Does a windshield chip repair count as an insurance claim?
- What happens if you chip the windshield on a rental car?
- Is it worth paying cash for a windshield instead of filing a claim?
- Does insurance cover windshield replacement?
- Does liability insurance cover windshield damage?
- What is full glass coverage?
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