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Measure Your Replacement Windows

You’re probably thinking about the same thing, how can I measure replacement windows? Well, it’s really quite simple! But just because it’s simple doesn’t mean that you can’t get it wrong. In this article you will learn how to measure your replacement windows the correct way.

Let’s start with the WIDTH

When we’re talking about window glass replacement or window sizes, the width is always the first measurement taken when we’re measuring or ordering a new window.

Steps on how to measure width:

1. It’s time to take out your tape measures. First, you need to measure the width horizontally between the side jambs (from jamb to jamb) at the top, middle, and bottom part of the window. You can also move the sash out of the way to take accurate measurements.

2. List the three measurements (top, middle, and bottom) and circle the smallest measurement out of the three. The smallest measurement will be your main measurement to give when purchasing the new window.


After measuring the width, we need to move on to the second thing which is the height of the window. It’s pretty much similar to the width measuring process, so this will be a piece of cake.

Steps on how to measure height:

1. Again, bring out your tape measure and measure the height vertically between the head jamb (top) up to the window sill (bottom). Measure at the left, middle, and right side of the window.

2. List the three measurements and pick out the smallest measurement. The smallest measurement will be the height.

TIP: If your window sill is sloped, you should measure from the highest point, which is usually right against the window. You can use a level to check if your sill is out of level.

Now we measure the DEPTH or SQUARE

There are two ways you can go about this, you can either measure the depth or the square of the window. The two options will be covered in this article so keep reading.

How to measure the depth:

1. Measure the depth of the window by running your tape measure from the exterior side of the frame to the interior side and take the measurement from
edge to edge of the window frame.

2. You can take several measurements on different locations of the frame.

3. List all of them and again, choose the smallest measurement as your final dimension for your depth.

TIP: If you can’t open your window, you can measure the depth on each side of the window glass and add them together. Then add the thickness of your window glass. It’s usually around ⅛ inch or 3mm in thickness.

Another way to measure depth:

1. Measure the depth of the jamb at the deepest section of your window. If you’re measuring a non rectangular window or one without an arch you can find the center of the window. Then measure from the center to the face of the frame, and add ½ inch.

How to measure the square:

1. There’s also another way to get the final dimension for the replacement window, it’s through the square. The first thing to do is to measure the diagonals of the window frame (upper left to lower right, and upper right to lower left) as accurately as possible.

2. List down the two measurements, Diagonal 1 and Diagonal 2. If the measurements are within ⅛ inch of each other there should be no problem when installing the new window. If it is more than ⅛ inch, then the new window might have to be ordered smaller in width to compensate for the installation.

Now that you’ve got the measurements you can take them to Tashman Home Center to get a quote on your new replacement windows. The new windows should be just about two inches narrower and two inches wider than the measured space. This leaves you an inch of space to adjust the window to fit it exactly where you want it. Use the depth measurements to ensure your windows won’t be sticking out of the frame opening. An aluminum window frame or any type of window frame can be measured using these steps.

Now you’ve got the knowledge on how to measure your replacement windows and now you can save money and time just by doing it yourself. You don’t need to hire a contractor for this one and it’s easy to do. If you can’t do it, it’s not a bad idea to consult with a local window contractor. He or she can definitely help you. You also need to keep in mind that since you’re dealing with measurements, accuracy is key. So always make sure that you’ve got the right measurements listed and you’re good to go. Contact us to discuss your windows options today!

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