What To Do If Your Windshield Cracks
Why do windshields crack?
Windshields crack for several reasons, most of which relate to stress being placed on the glass or flaws in its structure. Here’s a breakdown of the most common causes:
- Impact Damage
- Cause: Rocks, gravel, or other debris hitting the windshield, usually when driving.
- Effect: This often results in small chips that can later grow into cracks if not repaired.
- Temperature Changes (Thermal Stress)
- Cause: Sudden or extreme shifts in temperature—like pouring hot water on an icy windshield or blasting the defroster on high heat.
- Effect: Glass expands and contracts with temperature; uneven expansion creates stress, leading to cracks.
- Structural Stress
- Cause: Body flexing or twisting of the car due to driving over rough terrain, potholes, or poor chassis alignment.
- Effect: Puts pressure on the windshield, especially if it was already weakened.
- Poor Installation
- Cause: Incorrectly fitted or improperly supported windshields.
- Effect: Can cause uneven stress distribution and make the glass more prone to cracking over time.
- Manufacturing Defects
- Cause: Internal flaws or impurities in the glass during production.
- Effect: These create weak points that are more likely to crack under pressure or stress.
- Ignored Chips or Dings
- Cause: Small damage left unrepaired.
- Effect: Vibration, weather, or stress can turn a tiny chip into a long crack.
- Pressure Stress (Uneven Frame Support)
- Cause: Vehicle body damage or uneven windshield mounting.
- Effect: Puts uneven pressure on the glass, which can eventually lead to cracks, especially around the edges.
Cracks in windshields are usually caused by impact, thermal stress, poor installation, or structural flaws. Even tiny chips can grow over time, so early repair is crucial.
If your windshield becomes cracked, here are a number of steps that you can take to get it repaired:
If your windshield is cracked, here’s a step-by-step guide to getting it repaired or replaced, depending on the severity:
- Assess the Damage
Ask yourself:
- Is it a small chip or a long crack?
- Does it obstruct your line of sight?
- Is it near the edge of the windshield?
General rule:
- Chips smaller than a quarter or cracks shorter than 6 inches may be repairable.
- Larger cracks or damage in the driver’s view usually require replacement.
- Take Photos
Take clear pictures of the damage from different angles. This can help with:
- Insurance claims
- Getting accurate repair quotes
- Check Your Insurance
Call your auto insurance provider or log in to your account to check:
- Is glass coverage included?
(Many comprehensive policies cover repairs at no cost to you.) - Is there a deductible?
- Do they partner with any glass repair companies?
Some insurers even offer zero-deductible glass coverage in certain states.
- Find a Reputable Auto Glass Repair Shop
You can:
- Search for local auto glass specialists
- Use national services like:
- Safelite
- Glass Doctor
- Gerber Collision & Glass
- Or ask your dealership or mechanic for recommendations
Many shops offer mobile repair (they come to you), which is convenient if the crack is spreading or driving is unsafe.
- Get a Quote
Even if insurance is involved, get a quote first. You’ll need:
- Vehicle make, model, and year
- Description of the damage
- Photos (optional, but helpful)
- Repair or Replace
- Repair: Usually takes 30 minutes, costs around $50–$100, and can often be done same-day.
- Replacement: Takes 1–2 hours, costs $200–$500+