How to Fix Broken Window Glass: Complete DIY

• 20 May 2025

A cracked window is not just an eyesore—it can result in drafts, increased energy costs, and even become a safety risk. Prompt action is necessary, whether it’s a tiny crack or a broken-out pane. Luckily, if the breakage is only in the glass and the frame is intact, you can fix it yourself without replacing the entire window unit.

At Best Glass Offer, we understand how crucial clear, safe, and energy-efficient windows are to your home. That’s why we’ve developed this easy-to-follow DIY guide to assist you in repairing broken window glass like a pro—safely, efficiently, and inexpensively.

Is DIY Window Glass Repair for You?

Before you reach for your toolbox, ensure that:

• The window frame is not damaged or rotten.
• The glass is single-pane (DIYing double-pane or insulated glass can be more complex)
• You’re comfortable working with glass and basic tools.

If the broken window is double-pane, tempered, or part of a specialty unit, it’s best to call professionals like Best Glass Offer to ensure proper installation and sealing.

Tools and Materials You’ll Need:

• Safety goggles and gloves
• Measuring tape
• Putty knife or scraper
• Utility knife
• Glazier’s points (for wood frames)
• Glazing putty or silicone sealant
• Replacement glass (cut to size)
• Small pry bar or screwdriver
• Paint (optional for touch-up)

Step-By-Step Guide On How To Fix Broken Window Glass

Step 1: Safety First

Shattered glass is sharp and hazardous. Wear safety gloves and goggles before attempting any repair. If the window is severely broken, lay a tarp or thick cloth under it to catch glass fragments.

Apply painter’s tape over the cracks if the glass remains intact mainly—this prevents it from breaking further as you work.

Step 2: Take Out the Broken Glass

Remove the broken glass carefully. Begin by picking out loose pieces by hand (wearing gloves), then utilize a utility knife and putty knife to remove any remaining shards from the frame.

For wood windows, scrape out old glazing putty and glazier’s points (small metal clips that hold the glass in place). For metal or vinyl frames, remove screws or snap-in glazing strips holding the pane in place.

Carefully dispose of all broken glass in a thick garbage bag or cardboard box.

Step 3: Clean and Inspect the Frame

After the glass is removed, clean the window frame thoroughly. Scrap any remaining putty, old sealant, or debris with your putty knife or scraper.

Check the frame for rot, water damage, or warping. If the frame is rotten, stop and call a professional—this may necessitate complete window replacement.

If the frame is reasonable, lightly sand the area to provide a smooth, clean surface for the new glass.

Step 4: Measure for Replacement Glass

Measure the width and height of the opening using a measuring tape. Measure the portion of glass that can be seen, and subtract 1/8 inch from both width and height to accommodate thermal expansion and simple fitting.

Additionally, determine the glass thickness—standard single-pane residential glass is usually 1/8 inch thick.

Take measurements to a nearby glass supplier, or call Best Glass Offer to deliver precision-cut glass to your doorstep.

Step 5: Dry-fit the New Glass

When your replacement glass has arrived, carefully install it in the opening to test the fit. It will lie flat in the frame without having to press it in.

If all is well, remove the pane and get ready for installation.

Step 6: Install the New Glass

a) For wood frames

• Put a thin bead of glazing putty on the inside of the frame edge.
• Press in the new glass carefully.
• Use glazier’s points to support the glass—press them in with a putty knife every 6 inches.
• Add a finishing coat of putty around the outside edge of the glass. Spread it slightly on an angle so that water can run off.
• If necessary, let the putty dry for a few days, and then paint.

b) For frames made of aluminum or vinyl:

• Put a bead of silicone sealant onto the frame’s inner edge.
• Position the glass tightly in place.
• Replace the metal clips or the vinyl glazing strips.
• Use a damp cloth to remove the excess sealant before it becomes hard.

Step 7: Clean the Glass

After the glass is fastened and the sealant or putty is dried, clean both sides of the window with a non-ammonia glass cleaner. Do not push too hard against the glass for at least 24–48 hours.

Step 8: Touch Up (Optional)

If you have a wood frame, it’s time to touch up the paint. Not only does this enhance appearance, but it also seals the putty and prevents moisture from entering the frame.

When to Call in the Pros?

While single-pane glass replacement is within reach for most homeowners, some circumstances call for professional assistance:

• Double-pane or insulated glass units
• Tempered or safety glass
• Custom window shapes or sizes
• Damaged frames
• High or hard-to-reach windows

At Best Glass Offer, our skilled technicians replace all kinds of window glass efficiently and safely. We provide proper sealing, energy efficiency, and crystal-clear finish.

Advantages of Replacing Shattered Glass

A tiny crack can impact more than aesthetics. Replacing shattered window glass can offer the following:

• Enhanced energy efficiency and reduced utility bills
• Enhanced soundproofing against outside noise
• Enhanced safety and security
• Restored curb appeal
• Extended lifespan for your windows

Call Best Glass Offer Today

Need assistance with window glass repair? If you’re doing it yourself, or you want professional work done on it, Best Glass Offer is the local expert regarding glass replacement.

We provide quick turnaround, affordable prices, and expert guidance to ensure your windows are as secure, strong, and stunning as possible.

Call Best Glass Offer today for a free quote or to speak with one of our window experts. Whether it’s a simple DIY or a complete replacement, we’ve covered your glass needs.

Also read: Expert Guide to Double Hung Window Glass Replacement