
Measuring plastic window inserts is a simple DIY task that requires accuracy for a proper fit. Before measuring, it's important to understand the different parts of a window, such as the sash, head, sill, jambs, and jamb liner. The next step is to determine whether the window frame is square, level, and plumb, with 90-degree corners. Then, take measurements at three points: the top, middle, and bottom of the window opening, measuring from the surface of the jambs and excluding any trim. The smallest of these three measurements will be the width. To measure the height, start from the high point of the windowsill and measure to the top of the window opening at three locations: the left, centre, and right. Again, the smallest measurement will be the height.
| Characteristics | Values |
|---|---|
| Tools required | Tape measure, pen, paper |
| Parts of the window | Sash, Head, Sill, Jambs, Jamb liner, Lift, Rails, Head jamb |
| Window measurements | Width, Height, Depth |
| Width measurement | Place the tape measure horizontally between the inside jamb on the left and the right |
| Height measurement | Measure from the sill to the top of the window opening |
| Depth measurement | Measure between the inside window trim and the outside blind stop strip |
| Notes on width measurement | Measure from jamb to jamb, not accounting for trim strips. Measure at three points (top, middle, bottom) and use the smallest measurement |
| Notes on height measurement | Measure at three points (left, centre, right) and use the smallest measurement |
| Notes on depth measurement | There must be a minimum of 3 1/4 inches of opening depth |
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What You'll Learn

Understand window anatomy
Understanding the anatomy of a window is essential when measuring for plastic window inserts, as it ensures accurate measurements and effective communication with professionals. Here is a detailed guide to help you understand window anatomy:
Frame: The window frame is the structural backbone of the window, providing support, stability, and shape maintenance. It is typically made of materials such as fiberglass, vinyl, aluminum, or wood, each offering unique advantages in durability, aesthetics, and energy efficiency. The frame consists of three main components: the head, jambs, and sill.
Head: The head, or head jamb, is the main horizontal piece forming the top of the window frame.
Jambs: Jambs are the vertical pieces that form the sides of the window frame. They are also referred to as the window jambs or side jambs.
Sill: The sill is the main horizontal part forming the bottom of the window frame. It is where the sash rests when the window is closed.
Sash: The sash is the movable part of the window that holds the glass pane or panes. It allows the window to open and close, providing ventilation and access to the outdoors. Sashes can be single-hung, double-hung, casement, or sliding, depending on the window type. In double-hung windows, there are two sashes that can be opened from either the top or bottom, providing versatile airflow control.
Pane: The pane, or glass panel, is the transparent component of the window that allows light to enter and provides a view of the outside. Modern energy-efficient windows often feature dual panes or dual glazing, with an insulating gas between them to improve insulation and reduce heat transfer.
Other Components: There are also other smaller but vital window components, such as the jambliner, which is a strip on the sides of the window frame that ensures a snug fit for the sash. Additionally, spacers are small metal or non-metal components that sit between dual panes of glass, helping to retain insulating gas, prevent fogging, and reduce heat transfer.
Understanding these terms and components will help you effectively communicate your needs when discussing window measurements, replacements, and maintenance.
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Measure window width
Measuring the width of a window is a simple task, but it's important to be accurate. The first step is to identify the type of window you have. Is it a single- or double-hung window, or is it a sliding window? Perhaps you have an awning or casement window. Knowing the type of window will help you to understand the specific measuring instructions for that window.
For single- or double-hung windows, measure the width from jamb to jamb from the inside of the trim on one side of the window to the inside of the trim on the other side. Measure at three points: the bottom, middle, and top of the window. Record these measurements, and use the smallest one as the width of your window.
For sliding windows, the process is similar. Measure the width from trim to trim at the centre of the window. Again, make sure to record all three measurements (bottom, middle, and top), and use the smallest one as your final width measurement.
For awning or casement windows, extend your tape measure horizontally and measure the width at the centre from trim to trim.
If you have a bay or bow window, measure the width of each window panel at the centre, and note the width of the centre window separately as it may be different from the others.
For insert windows, measure the width from jamb to jamb or drywall to drywall if your window doesn't have trim. Measure from three spots: near the top, at the centre, and near the bottom. Use the smallest measurement as your width dimension.
It's important to note that you should always refer to the window manufacturer's specific requirements and instructions for measuring windows. Additionally, if your window has any bows, be sure to measure and record that information as well.
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Measure window height
Measuring the height of a window is a crucial step in any home improvement project. Whether you're installing new plastic window inserts, replacing old ones, or ordering replacement parts, accurate measurements are key to achieving a perfect fit. Here is a step-by-step guide to help you measure your window height accurately:
Prepare the Necessary Tools:
Before you begin measuring, gather the required tools to ensure accuracy. You will need a reliable tape measure with both metric and imperial units. It is also recommended to have a pen and paper to record your measurements. If your windows are out of reach, use a stable ladder or step stool to safely access and measure them.
Identify the Type of Window:
The method of measurement may vary depending on the type of window you have. Common window types include single-hung, double-hung, projection, casement, slider, or fixed. Understanding the different parts of your window, such as the jamb, head jamb, sill, and sash, is also essential before taking measurements.
Measure the Window Frame Height:
Start by measuring the height of the window frame. Position your tape measure at the top of the frame and extend it down to the windowsill. Record this measurement, ensuring it is accurate to the nearest eighth of an inch or millimeter.
Measure the Visible Glass Height:
Next, measure the height of the visible glass area. Place the tape measure at the top edge of the glass and extend it down to the bottom. Record this measurement as well. Be sure to measure both the left and right sides of the glass to account for any irregularities.
Check for Obstructions:
Inspect the window for any obstructions or hardware that might interfere with the installation of the plastic window inserts. Note the presence of locks, handles, or other fixtures that may affect the height measurements.
Double-Check Your Measurements:
To ensure accuracy, it is essential to measure the window height at least twice and compare the results. Consistent measurements provide confidence in the accuracy of your data. Take into account any specific features or frame characteristics that may impact your choices when selecting plastic window inserts.
Consider the Rough Opening:
If you are installing new windows or dealing with older homes, you may need to measure the rough opening, which is the framed space in the wall where the window will be installed. This step is critical if you are not using insert replacement windows, as it ensures a seamless fit for your plastic window inserts.
Record All Measurements:
Keep track of all your measurements to avoid confusion during the planning and purchasing stages. Record your measurements in a table or form, labelling each dimension clearly.
By following these steps, you will be able to accurately measure the height of your windows and make informed decisions when selecting plastic window inserts. Accurate measurements are essential to ensure a perfect fit and the success of your home improvement project.
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Measure window depth
Measuring window depth is a crucial step in ensuring your plastic window inserts fit perfectly. Here's a comprehensive guide to help you measure window depth accurately:
Understand Window Anatomy
Before you begin measuring, it's important to familiarize yourself with the different parts of a window:
- Jamb: The vertical pieces on either side of the frame that form the top and sides of the window frame.
- Head (or Head Jamb): The horizontal top part of the frame that touches the top of the sash.
- Sill: The bottom part of the frame where the sash rests when closed.
- Sash: The moveable or fixed part of the window that holds the glass.
Determine Window Type
The type of window you have will impact the specific measurements you need. Common window types include double-hung, casement, and picture windows. For plastic window inserts, you'll typically be dealing with insert replacement windows, which fit inside the existing window frame.
Check for Square Alignment
Standard replacement windows are square, with 90-degree corners. Measure from the inside of your home, from jamb to jamb, or drywall to drywall if your windows have no trim. If your measurements are within 1/8 inch or 1/4 inch of each other, your windows are square.
To measure window depth, follow these steps:
- Locate the Frame Step: Identify the frame step where your plastic window inserts will be installed. This is usually the existing window frame.
- Measure the Jamb Depth: Open the window and measure the jamb depth, which is the space at the sill between the back and front of the trim. For insert replacement windows, this should be a minimum of 3 1/4 inches.
- Measure Frame Depth: Place the metal corner of your measuring tape in the corner of the frame step and measure straight across. Record this depth measurement, as it will be important for installing your plastic window inserts.
- Check for Bows: Over time, window frames can curve or bow. To check for bows, stretch a string or a straight-edge tool from corner to corner. If there's a gap between the string and the frame, it has an outward convex bow. If the string touches any points on the frame, it has an inward concave bow.
By following these steps, you can accurately measure your window depth and ensure your plastic window inserts will fit snugly and securely. Remember to take your time and measure each window individually, as even windows in the same room can vary slightly in size.
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Compare measurements
Comparing measurements is a crucial step in the window-measuring process. It ensures that you get accurate dimensions for your window inserts and helps you determine if your windows are square. Square windows have 90-degree corners and are measured diagonally from corner to corner.
When comparing measurements, you should take measurements at three distinct points: the top, middle, and bottom of the window opening. This practice is consistent across various window types, including awning, casement, and sliding windows. For the width, measure from jamb to jamb or trim to trim, depending on the window style. For the height, measure from the high point of the windowsill to the top of the window opening.
After taking these three measurements, compare them to determine the smallest value for both width and height. These smallest measurements will be your width and height dimensions. If your windows are square, the measurements should be within 1/8 inch or 1/4 inch of each other, depending on the source.
Additionally, you can measure the depth of the window opening, which is the distance between the inside window trim and the outside blind stop strip. This measurement is crucial for ensuring a seamless replacement and improving the efficiency and aesthetics of your window inserts.
By following these steps and comparing your measurements, you can achieve accurate dimensions for your plastic window inserts, ensuring a proper fit and optimal performance.
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Frequently asked questions
First, measure the width of the window by placing a tape measure horizontally between the inside jamb on the left and the right. Then, measure the height by placing the tape measure vertically from the sill to the top of the window opening. Finally, measure the depth of the window opening by measuring between the inside window trim and the outside blind stop strip.
Sash: The moveable or fixed part of the window that holds the glass.
Head: The top part of the frame that touches the top of the sash.
Sill: The bottom part of the frame that touches the bottom of the sash.
Jambs: The vertical pieces on either side of the frame that touch the sides of the sash.
Measure at three points: the top, middle, and bottom of the window opening. Take measurements from the surface of the jambs, excluding any trim strips. Always use the smallest of the three measurements when ordering your replacement window.











































