At the most extreme end, it is possible to repair chips up to 3 inches in diameter and cracks up to 14 inches in diameter. The depth of the damage is also taken into account when determining if a windshield can be repaired. Windshield repair technology is an ever-evolving industry, so the ability to repair large chips or cracks changes regularly and may differ depending on the repair company. Generally, chips smaller than a quarter and cracks up to three inches long can be easily fixed.
The ROLAGS guide (Automotive Laminated Glass Repair Standard), administered by the National Windshield Repair Association (NWRA), outlines the size limits of repairs depending on the type of damage (in the form of a bull's eye, hole, crack, etc.). Again, these sizes may vary depending on the location of the damage and the capabilities of the workshop. For more technical specifications, consult the complete ROLAGS guide. While insurance companies have every right to decide what damages they will cover and what they won't, there is actually a business standard for auto glass repair published by the National Windshield Repair Association that identifies what types of damage can be safely repaired.
A windshield is essentially a glass sandwich: an outer layer of glass, an intermediate layer of plastic, and an inner layer of glass. This structure allows for a certain degree of flexibility when it comes to repairing chips and cracks. However, it is important to note that not all chips and cracks can be repaired. The size and location of the damage are key factors in determining whether or not a windshield can be fixed.