Why It Matters
A windshield repair costs $50–$150. A replacement costs $200–$600 and up. Knowing which one you need can save you hundreds of dollars — or prevent you from putting off damage that becomes a safety risk.
The good news: most chips can be repaired. The bad news: most people wait too long. A chip that could have been fixed for $75 in week one becomes a crack requiring full replacement by week four.
The Size Rule
The most commonly cited guideline comes from ROLAGS (the industry standards used by most shops and insurers):
- Chips: Repairable if smaller than 1 inch (roughly the size of a quarter)
- Cracks: Repairable if shorter than 6 inches (some shops go up to 12 inches with newer resin technology)
These are guidelines, not hard rules. The actual decision depends on more than size.
The Location Rule
Location on the windshield matters as much as size:
Driver's Line of Sight
The area directly in front of the driver — roughly a 12-inch band centered on the steering wheel — is the most critical zone. Even a perfectly repaired chip leaves a slight optical imperfection. Most shops, and many state inspection laws, will not approve a repair that falls in this zone. The answer is replacement.
Edge Damage
Cracks that start at the edge of the glass are structurally different from those that start in the middle. Edge cracks tend to propagate quickly and can compromise the windshield's structural integrity in a crash. Industry standard: edge damage longer than 1–2 inches warrants replacement rather than repair.
Deep Chips and Multiple Impacts
A chip that penetrates both layers of glass (laminated windshields have two glass layers bonded to a PVB plastic interlayer) cannot be properly repaired with resin. Similarly, if you have multiple chips within a few inches of each other, the structural integrity of the repair may be insufficient.
Types of Chips — What You're Actually Looking At
- Bull's-eye: Circular impact with a cone of damage pointing inward. Highly repairable.
- Half moon (partial bull's-eye): Same as bull's-eye but incomplete circle. Repairable.
- Star break: Multiple cracks radiating outward from impact point. Usually repairable if under 3 inches total span.
- Combination break: Star + bull's-eye at the same impact point. Repairable depending on size.
- Long crack: Straight or curved line. Under 6 inches: often repairable. Over 6 inches: replacement territory.
- Edge crack: Starts at the edge. Replace.
How Chip Repair Works
Windshield chip repair involves injecting a clear resin into the damaged area under vacuum pressure. The resin fills the void, bonds to the surrounding glass, and is cured with UV light. When done correctly, the repair is nearly invisible and restores roughly 85–90% of original strength to the damaged area.
The whole process takes 30–45 minutes. Most shops offer mobile repair — a technician comes to your home or workplace. Many insurance policies cover chip repairs with no deductible at all, specifically to encourage early repair over costly replacement.
When Waiting Makes Things Worse
Temperature changes are the enemy of a repairable chip. When a chip exists in the glass, small changes in pressure — from parking in the sun, blasting your defroster, or even a cold snap — stress the glass at the chip site. What was a half-inch bull's-eye on Monday can become a six-inch crack by Friday.
If you have a fresh chip, get it evaluated within a week. If you're in a cold-weather state like Illinois, Colorado, or Washington, that urgency is even higher — freeze/thaw cycles are particularly damaging to unrepaired glass.
The Cost Comparison
| Service | Typical Cost | Time | Insurance |
|---|---|---|---|
| Chip repair (1 chip) | $50–$100 | 30–45 min | Often $0 deductible |
| Multiple chips (same visit) | $100–$150 | 45–60 min | Often $0 deductible |
| Full replacement (non-ADAS) | $200–$500 | 60–90 min | Deductible applies |
| Full replacement (with ADAS) | $450–$900+ | 2–4 hours | Deductible applies |
Quick Decision Guide
Ask yourself these questions:
- Is the chip smaller than a quarter AND not in the driver's line of sight? → Repair
- Is the crack shorter than 6 inches AND not at the edge? → Repair (probably)
- Is the damage in the driver's direct line of sight? → Replace
- Does the crack start at the edge of the glass? → Replace
- Is the crack longer than 12 inches? → Replace
- Are you unsure? → Get a free evaluation from a shop
Most shops offer free assessments. Find a verified auto glass shop in your area using ShieldFinder — filter by your state and look for mobile service if you'd rather not drive a cracked windshield to the shop.