Fixing Glass in an Old Double-Hung Window: A DIY Repair Tutorial

Old homes often have a charm and character that modern buildings can’t match. But with that charm comes maintenance and one of the most common issues is cracked or broken glass in double hung windows. If you’re facing this problem, don’t worry! With the right tools and a little guidance, double-hung window repair can be a manageable DIY project.

At Best Offer Glass, we do it all when it comes to glass, from replacement to restoration. In this guide, we will take you through repairing old window glass in a double-hung window step by step, saving you time and money and maintaining the one-of-a-kind charm of your vintage home.

What Is A Double-Hung Window?

A double-hung window features two sashes (those movable panels that contain the glass panes) that move up and down separately. Such windows abound in most historic houses throughout the U.S., recognized for their elegant look and functional ventilation. The wood or sash putty that holds the panes into place, however, tends to degenerate with time, causing loose or broken glass.

As for glass replacement double hung windows, a DIY job can be the best way out—if you’re thorough and well-equipped.

Tools and Materials You’ll Need For Double Hung Window Repair

To begin with your double hung window repair, collect the following tools and materials:

• Safety gloves and goggles
• Putty knife
• Glazier’s points (metal clips which secure the glass into position)
• Glazing compound or window putty
• Replacement glass pane
• Measuring tape
• Glass cutter (if using your glass)
• Utility knife
• Small hammer
• Paint (if you plan on repainting the frame later)

Step-by-Step DIY Guide to Repair Or Fix Old Window Glass

Step 1: Take Out the Window Sash

Remove the window sash containing the shattered pane. In most double-hung windows, this will involve taking out the interior stops or parting beads. Handle with care —older wood can be brittle.

Step 2: Remove Broken Glass Carefully

Carefully take out the last of the broken glass. Put on thick gloves and safety goggles to protect yourself. Cut off the old glazing compound or putty where the glass meets with a utility knife. Get rid of the old glass safely in a thick, sealed container.

Step 3: Measure and Cut the Replacement Glass

If you’re buying a pre-cut pane, measure the height and width of the opening and subtract 1/8 inch from each side to allow for expansion and fitting. If you’re cutting the glass yourself, use a glass cutter and straight edge.

This is the most crucial part of glass replacement double-hung—accurate measurement ensures the glass fits securely without forcing it into place.

Step 4: Install the New Glass Pane

Put a thin coat of glazing compound into the groove of the frame, and then place the replacement pane in the opening. Press it firmly into the putty. Hold the pane in position using the glazier’s points—approximately 4–6 inches apart along each side of the frame.

After that, apply another layer of putty along the edges and smooth it out with a putty knife to seal the glass. Allow it to cure as directed by the manufacturer (typically 1–2 weeks). Weatherproofing your window at this step is essential to achieve successfully any double hung window repair.

Step 5: Reinstall the Window Sash

Once hardened, reinstall the sash into the window frame. Replace any stops or trim pieces you removed. Check the window movement to confirm both sashes slide freely.

If the window sticks or fails to close, check for misalignment or too much paint or debris in the tracks.

Step 6: Repaint (Optional)

If the window frame was bruised or the paint was chipped while doing the repair, think about giving it a new coat of paint. This not only looks better but also protects against moisture.

Make sure that the glazing compound has dried completely before painting over it.

When to Call the Professionals

Though this guide enables you to repair or fix old window glass on your own, not all windows qualify as DIY projects. If your window is badly broken, it has rotten wood, or its part of a historic home with restoration needs, it’s advisable to seek professional help.

We at Best Offer Glass provide professional double-hung glass replacement services for vintage and custom windows. We properly seal, insulate, and aesthetically match your original frames.

Advantages of Home Double Hung Window Repair

• Savings on Labor Costs: Professional labor expenses can be costly. With DIY projects, you save a great deal on labor costs.
• Personalization: You get to decide on the kind and thickness of the glass.
• Satisfaction: Completing a home repair on your own is rewarding—especially in historic or vintage homes.

Working with glass requires care and precision. If you’re not confident or comfortable, always opt for professional assistance.

Tips for a Successful Double Hung Window Repair

• Always measure twice before cutting or ordering glass.
• Don’t skip the glazier’s points—they are essential for securing the glass.
• Use high-quality putty or glazing compound to ensure a lasting seal.
• Allow extensive curing time before painting or cleaning the window.

Repairing a cracked pane on a double-hung window can be intimidating, but using the proper tools and instructions, it’s a project many homeowners can do themselves. From removing shattered glass safely to caulking in the new pane, this DIY project can give your old windows a brand new lease on life—without the hefty price tag.

Best Offer Glass is here to guide you every step of the way. Whether you are learning how to repair old window glass, performing a simple double-hung window repair, or require assistance with a more complicated glass replacement double repair, our professionals are just a phone call away.

Need assistance or a professional touch? Call Best Offer Glass today for professional guidance or on-site assistance to meet the one-of-a-kind needs of your home.