How to Replace Glass in Garage Door Window

Garage door windows are prone to breakage due to various factors, such as rogue balls, extreme weather conditions, or accidental impacts. Repairing or replacing the broken glass is essential to maintain the integrity, functionality, and aesthetics of your garage door. In this guide, we will explore different types of glass used in garage door windows, the thickness of replacement glass, the cost involved, and the step-by-step process of how to replace glass in garage door window.

How to Replace Glass in Garage Door Window

4 Types of Glass Used in Garage Door Windows

When it comes to garage door windows, there are several types of glass commonly used. Each type has its advantages and considerations. Let’s take a closer look at these options:

1. Clear Glass

Clear glass is a popular choice for garage door windows as it allows maximum visibility. However, for privacy, consider using curtains, blinds, or frosting films to block the interior view of the garage.

2. Tempered Glass

Tempered glass, also known as toughened glass, is a widely used option due to its strength and safety features. It is heat-strengthened to achieve high durability and resistance to breakage. Tempered glass is available in frosted and tinted styles, providing additional functionality and aesthetic appeal.

3. Laminated Glass

Laminated glass is a multi-layered glass held together by a strong adhesive resin interlayer. This type of glass is highly durable and potentially unbreakable. It also provides insulation, making it a suitable choice for areas exposed to harsh weather conditions.

4. Plexiglass

Plexiglass is an affordable alternative to traditional glass. It is a lightweight and shatter-resistant material that is easier to work with. While plexiglass may not have the same visual clarity as traditional glass, it offers durability and cost-effectiveness.

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Determining the Thickness of Replacement Glass

The thickness of the replacement glass for your garage door window depends on various factors, including the type of glass previously installed, weather conditions, and personal preferences. Generally, single-pane tempered glass replacements come in thicknesses of 1/8″, 3/16″, and 1/4″. For laminated or double-pane glass, the thickness can go up to 1/2″. If you opt for plexiglass, it is available in a thickness range of 1/8″ to 1″.

The Type of Glass Previously Installed

It is crucial to measure the opening accurately to ensure a proper fit. A difference of just 1/8″ can lead to issues with installation and functionality.

Cost of Replacing Garage Door Window Glass

The cost of replacing garage door window glass can vary depending on factors such as the size of the window, type of glass, and labor costs. You can expect to spend between $100 and $250 on average for the replacement. It is recommended to obtain quotes from professionals or suppliers to get a more accurate estimate for your specific situation.

5 Ultimate Step-by-Step Guide for How to Replace Glass in Garage Door Window

Replacing broken or damaged glass in your garage door window can be a task that requires careful attention and patience. While the process may vary depending on the type of garage door and window, the following steps provide a general guideline:

Step 1: Remove the Broken Glass

  • Start by ensuring your safety by wearing protective gloves and eyewear.
  • If you have a wooden garage door, carefully remove the molding or quarter round that holds the window in place. Use a prying tool to avoid damaging the molding.
  • For metal doors, look for screws on the inside window frame that hold the trim in place. Unscrew these screws to release the frame.
  • In case your garage door has a clip design, you may need to remove the entire panel/section to access the window. This step is best left to professionals due to the complexity involved.

Step 2: Clean and Prepare the Frame

  • Once the broken glass is removed, clean the window frame thoroughly. Remove any caulk or sealant using a putty knife or similar tool.
  • Ensure that the frame is clear of any debris or remnants from the old glass. This will provide a clean surface for the new glass to be installed.
Clean the Window Frame

Step 3: Measure and Acquire the Replacement Glass

  • Measure the dimensions of the opening accurately to determine the size of the replacement glass needed. Take into account the thickness of the glass as well.
  • Purchase the replacement glass from a reputable supplier, ensuring it matches the specifications required for your garage door window. Consider factors such as type of glass, thickness, and any necessary customization.

Step 4: Install the Replacement Glass

  • Apply a suitable adhesive or sealant around the edges of the frame to create a secure bond with the new glass.
  • Carefully insert the replacement glass into the frame, ensuring it fits snugly. Avoid applying excessive pressure that may cause the glass to crack.
  • For wooden doors, reinstall the molding or quarter round to hold the glass in place. Use small nails or appropriate fasteners to secure it.
  • For metal doors, reattach the inner window frame using screws. Make sure the frame aligns properly with the outer frame.

Step 5: Clean and Inspect

  • Wipe off any excess adhesive or sealant from the glass and frame using a clean cloth.
  • Inspect the window to ensure it is properly installed, without any gaps or loose components.
  • Check the functionality of the window by opening and closing it to ensure smooth operation.

You Can Check It Out to Add Windows to Garage Door.

Wipe Off Any Excess Adhesive

FAQs About How to Replace Glass in Garage Door Window

Can You Replace Glass in Garage Door?

Yes, it is possible to replace the glass in a garage door. Simply measure the dimensions of the glass panel, remove the damaged glass, purchase a replacement panel, clean and prepare the frame, install the new glass, secure it properly, and test the door’s functionality. If you’re unsure or lack the necessary skills, it’s best to hire a professional technician or garage door repair service for a safe and efficient replacement.

Can I Change the Windows on My Garage Door?

Yes, you can change the windows on your garage door. Start by selecting the new windows that fit your desired style and dimensions. Remove the old windows, clean the frame, and install the new windows securely using the appropriate fasteners or brackets. Test the garage door to ensure proper functionality. If you’re uncertain or lack the necessary skills, it’s best to hire a professional technician or garage door repair service for a safe and effective window replacement.

What Kind of Glass is Used in Garage Door Windows?

The type of glass used in garage door windows is typically either tempered or acrylic. Tempered glass is a safety glass that is heat-treated to make it stronger and more resistant to breakage. It is designed to shatter into small, dull fragments when broken, reducing the risk of injury. Acrylic, on the other hand, is a lightweight and impact-resistant plastic material that is often used as an alternative to glass. It offers good clarity and durability while being less prone to shattering. The specific type of glass used may vary depending on the manufacturer and the desired level of safety and insulation.

What Size Glass is a Garage Door Window?

The size of a garage door window can vary depending on the design and style of the door. Common sizes for garage door windows range from 14 inches by 7 inches to 24 inches by 12 inches. However, it’s important to note that these are just general guidelines, and not all garage door windows will have the same dimensions. The size of the window may also be influenced by factors such as the number of windows on the door and the overall size of the door itself. If you are replacing a garage door window, it is recommended to measure the existing window or consult the manufacturer for the specific size requirements.

You Can Check It Out to Refinish a Wood Garage Door.


Replacing broken or damaged glass in your garage door window is a task that requires careful attention and adherence to safety precautions. By following the step-by-step guide provided in this article, you can successfully replace the glass and restore the functionality and appearance of your garage door. However, if you are unsure or uncomfortable with the process, it is recommended to seek professional assistance to ensure a proper and safe installation. Remember to prioritize safety and take the necessary precautions throughout the entire process.

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