DIY Window Crack Repair Guide

You can repair a small crack in a single-pane window with fixing tape, transparent nail polish, glue, or epoxy.
Written by Talullah Blanco
Reviewed by Melanie Reiff
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There are three main cracks that can show up in your window, each with different causes. You can use fixing tape, transparent nail polish, glue, or epoxy to repair small single-pane window cracks. 
A crack in your window glass can be worrisome, not to mention costly to repair by a professional. If you catch a crack forming early, though, you can repair it yourself and prevent the crack from spreading. 
Homeowners should know the most common types of window glass cracks, their causes, and how to repair them. That’s why the
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Does home insurance cover window crack repairs?

Your standard home insurance policy will cover the cost to repair the cracks in your window if they are caused by a named peril, like hail, windstorm, or theft. 
If the window cracks are caused by lack of maintenance, wear and tear, or your kid accidentally hitting a baseball in the wrong direction, you’ll have to pay for the cost of repairs yourself. 
Key Takeaway Home insurance will only pay to repair your window if the cracks are caused by something your policy covers, like hail or theft.

Types of window glass cracks

Identifying the type and cause of the crack in your window can help you determine whether you can repair it yourself and how to prevent future cracks. Here are the main types of window cracks and how they happen.

Temperature stress cracks

Temperature stress cracks occur when extreme temperature changes cause the glass to expand at different rates. They crack at a perpendicular angle and start near the edges of your window. 
Your windows may be susceptible to temperature stress cracks if they are located on a shaded or recessed wall.

Impact cracks

Impact cracks occur when an object comes into contact with your window, resulting in a crack pattern that radiates from a central point. A rock or golf ball hitting your window could cause an impact crack. 
These cracks are the most common and hardest to predict. 

Chips

Extreme weather conditions, such as hail and windstorms, can cause chips, dings, or blemishes in your window. While chips are not cracks, they can spread to become cracks if they are exposed to temperature swings or rough handling. 
Key Takeaway Small cracks in your window will spread if they are not repaired, no matter the cause.

DIY window crack repair methods

If you have a small crack in a single-pane window, you can use do-it-yourself methods to minimize the crack’s appearance and prevent the crack from spreading. The following are several methods to try using everyday items.

Fixing tape

Use clear packing tape to seal the crack and prevent it from spreading throughout your window. While this method is not the most discrete, it is an easy short-term solution you can use if you plan on hiring a window repair specialist. 

Nail polish or glue

Fill the crack with transparent nail polish or glue and let it dry completely. Repeat the process until the crack is filled and sealed. Be careful not to touch the final coat before it is done drying to ensure a smooth finish. 

Epoxy

This method uses a clear two-part epoxy and will secure the best results if done correctly. Purchase epoxy from your local craft store and follow these steps:
  • Wash the glass surrounding the crack with dish soap and wipe clean.
  • Mix the epoxy resin and hardener for 20 seconds in a well-ventilated area.
  • Apply the epoxy to the crack using a putty knife. 
  • Scrape excess epoxy away with a razor blade and let it cure for 24 hours.
  • Polish the crack with a clean rag and glass cleaner. 
Carefully read and follow the specific product directions for the epoxy you purchased. Some epoxy requires heat to cure, while others don’t. 
Key Takeaway Use clear nail polish or glue for an easy DIY fix or purchase epoxy for a more sturdy solution to window cracks. 

How much does it cost to repair broken window glass?

Depending on the type of glass, the size of the pane, and the crack itself, it can cost between $100 and $880 to have a professional repair a window crack. 
You can save money by doing all repairs yourself when possible. Depending on the do-it-yourself method you use it can cost as little as $1 to $12 to repair a window glass crack.

Avoiding future cracks in your window glass

The best way to prevent future cracks in your window glass is to anticipate the cause of the cracks. 
If your glass is old, improperly insulated, or regularly exposed to temperature swings, you may need to consult a window professional for the best prevention method. 
If hail or windstorms regularly occur in your area, consider installing an awning above your windows to curtail the damage. If your windows are at risk of being vandalized, you can build a protective barrier to shield them. 

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FAQ

You can repair a small crack in a single-pane glass window with fixing tape, nail polish, glue, or epoxy. You’ll have to consult a professional to repair large sprawling window cracks.
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