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Learning how to replace window glass in a wooden frame is essential for maintaining the charm and character wooden windows bring to your home. When the glass breaks or cracks, it needs careful handling. Unlike aluminium frames, wooden window frames often use putty and small pins to secure the glass. Whether you’re restoring an old window or replacing a broken pane, this guide will walk you through how to replace window glass in a wooden frame step by step.
Tools & Materials You’ll Need
Before starting the process of replacing window glass in a wooden frame, make sure you have the following tools and materials ready:
- New glass pane (cut to size)
- Measuring tape
- Glazing putty or wood glazing compound
- Putty knife
- Glazier’s points (metal tabs/pins)
- Flat-head screwdriver
- Protective gloves and safety goggles
- Utility knife or chisel
- Paint (optional)
Step-by-Step: How to Replace Window Glass in a Wooden Frame
Step 1: Ensure Safety First
Put on protective gloves and goggles. If the old glass is cracked, apply masking tape over the surface to prevent shattering while removing.
Step 2: Remove the Broken Glass
- Use a putty knife or screwdriver to remove loose pieces carefully.
- Dispose of all shards safely and vacuum the area to remove micro-fragments.
📌 If the pane is still intact but cracked, loosen the putty edges first and then remove the pane in one piece.
Step 3: Remove the Old Putty
- Scrape out all old putty from the frame with a chisel or utility knife.
- Be patient—putty in old frames can be hardened and brittle.
- Remove any glazier’s points with pliers or a screwdriver.
✅ Clean the wood channel thoroughly before fitting the new glass.
Step 4: Measure and Fit the New Glass Pane
Measure the rebate (inner edge) of the frame:
- Subtract 3mm from width and height to allow for expansion.
- Insert the new glass panel into the cleaned frame to check fit.
If the fit is too tight, remove and trim slightly or re-check your measurements.
Step 5: Secure the Glass with Glazier’s Points
- Press the glass into place.
- Insert glazier’s points about 10cm apart on each side to hold the glass securely.
- Push the points gently into the wood using a putty knife.
Step 6: Apply New Glazing Putty
- Roll the glazing putty into thin strips and press into the edges of the frame around the glass.
- Smooth the putty with a putty knife at a 45° angle.
- Ensure clean, even lines for a neat appearance.
Let the putty cure—this may take several days depending on the product.
Step 7: Paint the Putty (Optional)
Once cured, you can paint over the putty to match the frame and protect it from weathering.
Tips for Best Results
- Work on a dry day—moisture affects how well the putty adheres.
- Choose putty that’s compatible with your paint if you intend to repaint.
- Always double-check glass dimensions before cutting or ordering.
When to Call a Glazier
Consider hiring a glass replacement professional if:
- You’re working on antique or valuable windows
- The frame is rotting, warped, or water-damaged
- You need double-glazing or laminated safety glass
- You want a faster, mess-free replacement
