
Window panes can be replaced, and it can be done as a DIY project to save money. However, modern double or triple-pane windows may require professional replacement due to their complex construction. Before starting the replacement process, it is important to understand the basics of window panes, such as the type of glass and the right tools and materials needed. Safety should be a top priority when replacing a window pane, as working with glass requires careful handling and proper protection. The cost of DIY window replacement will always be cheaper than hiring a professional, but it is important to consider the complexity of the job and whether professional assistance is needed.
| Characteristics | Values |
|---|---|
| Difficulty | Replacing a window pane is a manageable DIY project, but it requires some technique. It is not too hard, but it is also not the easiest task. |
| Cost | DIY replacement of a single-pane window pane typically costs between $75 and $600, including materials. The main expenses are the glass pane, putty, and any tools you might need to purchase. On the other hand, professional replacement of a single-pane window pane can range from $175 to $900 per window, depending on the size and complexity of the job. |
| Time | It can be a time-consuming process, especially if you are doing it for the first time. |
| Safety | Working with glass and potentially old materials requires careful handling and proper protection. |
| Tools | Putty knife, utility knife, glass cutter, screwdriver, cut-proof gloves, and eye protection. |
| Materials | Glass pane, putty, painter's tape, exterior paint, glass points, double-sided foam tape, silicone, or silicone caulk. |
| Preparation | Measure the height, width, opening of the pane, and thickness of the old glass. Order a glass sheet and cut it to the correct size, or have a hardware store cut it for you. |
| Installation | Pop out the vinyl strip from the window frame. Remove old glazing putty, glazing clips, and glazing points. Prime the bare wood and lay a bead of new putty in the frame. Set the glass on it and secure it with glazing points. Paint the putty with a primer and apply a coat of exterior paint. |
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What You'll Learn

DIY vs professional replacement
Window pane replacement is generally cheaper than a full window replacement. The cost of replacing a window pane varies based on the pane type, size, and labor. Single-pane windows are the most basic and affordable, while double- and triple-pane windows are more complex and expensive.
DIY Replacement
DIY window pane replacement is possible, especially for single-pane windows in older homes. The process is straightforward and can save money, but it requires patience, attention to detail, and the right tools and materials. Safety should be a top priority when working with glass, and proper protection, such as gloves and eye protection, is crucial. The cost of DIY window pane replacement for a single-pane window typically ranges from $75 to $600, including materials.
Professional Replacement
Professional replacement is recommended for double- and triple-pane windows due to their complex construction and the need to ensure an airtight seal. Professionals have the tools and expertise to handle complex replacements safely and efficiently. The cost of professional replacement for a single-pane window ranges from $175 to $900 per window, depending on the size and complexity of the job. For double-pane windows, the cost is typically between $250 and $1,200, while triple-pane windows will cost almost double.
When to Choose Professional Replacement
Consider hiring a professional if you are dealing with large or oddly shaped windows, or if you are not experienced in working with glass. If you are unsure about any part of the process or dealing with a complex window system, don't hesitate to seek professional help. Additionally, professional replacement can save time, as a single-pane window can typically be replaced by a professional in under an hour.
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Removing the old pane
If you have vinyl or aluminum windows, you will need to remove the vinyl strip from the frame. Insert a flat-head screwdriver or the edge of a putty knife under the strip to start, and then finish removing it by hand. If there is old tape or silicone holding the glass, carefully run the tip of a sharp utility knife between the glass and the old material to break the seal.
Next, use a putty knife to remove the old glazing putty. A heat gun can be helpful here, especially on hard-cured putty. Remove the old glazing clips, glass, and glazing points. For a wood frame window, use a wire brush to clean out any dirt and residue on and inside the frame.
Before removing the glass, measure the height, width, and opening of your pane, as well as the thickness of the old glass. Write these measurements down so that you can order a new pane or cut a new pane to size.
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Measuring and ordering a new pane
Measuring a window pane for replacement is a crucial step in the window replacement process. While it may be tempting to skip this step and call a professional, measuring yourself can save time and money. There is no need for special equipment, and by using a measuring tape, you can measure your windows accurately. Here is a step-by-step guide to measuring and ordering a new window pane:
Removing the Old Pane
Before measuring, you may need to remove the old glass from your window. This can be done by carefully breaking the seal with a sharp utility knife and removing any old glazing putty with a putty knife. Be sure to wear gloves and safety protection, as there may be small shards of glass. If the glass is already cracked or broken, carefully remove each piece and then take out the frame.
Measuring the Window Frame
Once the old glass has been removed, you can start measuring the window frame. Measure the height and width of the frame from the bottom to the top and from the left, centre, and right of the window. Take the smallest measurement of the height and width before deciding on your replacement window. You can also measure diagonally on both sides to ensure accuracy. It is important to note that the replacement window size should be smaller than the rough opening, so allot for space for the window sill, headers, and trimmers.
Measuring the Depth
After taking the height and width dimensions, measure the depth of the window frame. Measure the depth from the inside window trim to the outside blind stop strip. This will ensure that your new window pane fits securely in the frame.
Ordering a New Pane
With your precise measurements, you can now order a new window pane. It is important to note the type of glass you need, as this will impact the price. If you are unsure, consider how the old glass broke. If it broke into large, jagged pieces, it was likely annealed glass, the most common type. If it crumbled into tiny pieces, it was likely safety glass. You can order a large glass sheet and cut it to size yourself, or you can take your measurements to a glass repair shop, and they will cut it for you.
Test Fitting
Before installing your new window pane, always test fit the glass dry. This will ensure that your measurements are correct and the pane fits securely.
By following these steps, you can accurately measure and order a new window pane, saving you time and money on repairs.
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Installing the new pane
Before installing a new window pane, ensure you have the necessary safety gear, including safety goggles and protective gloves.
If you are using a glass pane, it is important to measure the height, width, and opening of the window frame, as well as the thickness of the old glass pane. You can then order a new glass pane or cut it yourself, leaving about 1/8" of space for the wood to expand. If you are using a Plexiglass pane, you can score and snap it by hand to fit the window.
Once you have your new pane, clean the window frame with a damp cloth to remove any dirt, debris, or old paint. If the window frame is damaged, you may need to repair it before installing the new pane.
Next, apply a bead of caulk or silicone to the rabbet groove of the window frame. Work quickly so that the caulk does not dry before you insert the new pane. Firmly hold the new pane and line it up with the sash, sliding it into place from the bottom up. Press down gently to ensure the pane adheres to the caulk.
If you are using a glass pane, you can secure it with glazier's points or small metal triangles called glass points. If you are using a Plexiglass pane, you may be able to use silicone caulk to hold it in place.
Finally, apply a new layer of glazing compound to seal the window and prevent moisture from entering. You can use either latex glazing putty or oil-based glazing compound. Smooth the glazing compound with a putty knife, and use your finger to fill in any gaps or unevenness.
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Cost of replacement
The cost of replacing a window pane depends on several factors, including the size of the window, the type of glass, the complexity of the installation, and labour costs. Here is a detailed breakdown of the costs involved:
Window Size
The larger the window, the more expensive it will be to replace. Standard window sizes, such as 110cm x 80cm, can cost around $350 to $800 to replace. Smaller windows, such as those measuring 85cm x 75cm, may cost just over $200. Very small windows, such as egress windows, can cost as little as $100 to $300 to replace a single pane. On the other hand, large bay windows can cost upwards of $3000 to replace all panes.
Glass Type
The type of glass being replaced also affects the cost. Basic single-pane windows are the most affordable to replace, typically costing $100 to $400 on average. Double-pane windows are more expensive, with replacement costs averaging $600. Triple-pane windows are the most costly, ranging from $400 to $700 or more.
Specialty glass types, such as tempered glass or safety glass, will also increase the price. Tempered glass costs an average of $175 to $600 to replace, while safety glass can range from $350 to $400. Low-emissivity glass, which blocks UV rays and infrared radiation, is another specialty option that will increase the overall cost.
Installation Complexity
The complexity of the installation can also impact the final cost. For example, replacing the glass in a wood frame is more challenging than working with vinyl or aluminum windows, which can be repaired in place without removing the sash. Some window designs are also more intricate and require more labour to replace the glass, such as bay and bow windows with multiple panels.
Labour Costs
Labour costs can vary depending on the window replacement company and the region. On average, labour can cost around $200 per window, but this may be higher or lower depending on the complexity of the installation and the number of panes being replaced.
Additional Costs
There may be additional costs involved in a window pane replacement project. For example, if the putty has lost its stickiness, it may need to be replaced, which typically costs around $20. Seal replacement is another potential expense, costing about $70 to $120. If the window frame needs to be repainted, there may be additional costs for paint and supplies.
DIY Option
It is possible to replace a window pane as a DIY project to save on labour costs. The materials required, such as glass, putty, and tools, can typically be purchased for under $100. However, it is important to carefully measure the window and cut the glass to the correct size to ensure a proper fit.
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Frequently asked questions
Yes, it is possible to replace a window pane yourself. It is a manageable DIY project that can save you money. However, modern double or triple-pane windows typically require professional replacement due to their complex construction.
If you are dealing with large or oddly shaped windows, it is advisable to call a professional. Professionals have the tools and expertise to handle complex replacements safely and efficiently.
Safety should be your top priority when replacing a window pane. Wear protective gear, including cut-proof gloves and eye protection. When cutting glass, always work on a flat, stable surface. Tape heavily over any broken or cracked areas in the glass before beginning the repair.
You will need a glass pane, putty, a putty knife, a utility knife, a screwdriver, glass points, and primer. If you are cutting the glass yourself, you will also need a glass cutter and oil to apply to the cutter.


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