Do You Measure Replacement Windows from the Inside or Outside?

Do You Measure Replacement Windows from the Inside or Outside?

Are you looking forward to getting your windows replaced? Then it is essential to have a clear understanding of how to take measurements. That’s because failing to take correct measures will lead you towards more hassle and frustration in the long run.

One of the biggest obstacles that you will come across when measuring replacement windows is determining whether you should measure inside or outside. If you can follow the steps on how to take the correct measurements of windows, you will be able to find a reliable answer to that question and move forward.

  • Take a look at the window square

It would help if you started taking measurements from the window square. In other words, you need to take a look at the diagonal distance from one corner to the other corner of the window. You should take this measurement from inside the home. You can get your hands on a measuring tape and obtain the size.

Once you measure the distance in one diagonal, you should switch and take measurements in the other diagonal as well. In case of both these measurements are in tally with each other, you can proceed because the standard window sizes available in the market will be able to cater to your requirement. They can provide a perfect fit for you at the end of the day as well.


  • Measuring the width of the window 

The next step is to go ahead and measure the width of the window. You should pay particular attention to this. In addition to that, there are some important tips which you need to keep in mind when measuring the width of the windows. This should be done outdoors.

You should never include trim when you measure the width of the windows. While you are taking measurements, you will come across the need to expose the jamb or the vertical side of the window frame. You can do that by raising the window sash. You can then place your measuring tape horizontally and take the measurements from left to right.

You can close the window and take a similar measurement from the middle part of your window as well. Then it would help if you took measurements for the distance that exists in between the jambs. You can proceed to measure the gap that exists between jambs near the top of your window. This will be the width of your window.

  • Measuring the height of the window

You will need to take measurements of your window height from outdoors. You should grab your measuring tape and then take measurements from the top to the bottom of the opening. This will be the area where the sash is resting once it is closed. While taking this measurement, you need to make sure that you are not taking any measures of the horizontal trim board, which is extending from the wall.

You need to take three different vertical measurements. One should be from the left side of your window. Then you will be able to proceed to the header. Then you can take measures of the right side of the window.

You should then go ahead and record the smallest number. This will be the measurement of the height of your window.

  • Measuring window screens 

The process that you have to follow to take measurements of window screens is quite straightforward. If you have already replaced the screens, the process you have to follow to take measurements will become even more convenient. That’s because you need to measure the height and width of it.

If the screen is added to the window, you can follow the below-mentioned steps to take measurements and move forward.

You should initially measure the distance that exists in between screen channels within the window frame. After you take measurements, you should reduce 1/8 inches from the reading you got for width. Then you can proceed to take measurements of the height. You should raise the sash and measure the distance up to the lip or the ridge that is holding your screen in place. You should add 1/8 inches to that reading and end up with the height measurement.

It would help if you took this measurement from outside.

Now you have a clear understanding of how to take all the essential measurements of the existing window at the time of replacing it. If you can follow these steps, you will be able to end up with the best results in replacing your windows.

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