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How to Measure for Basement Replacement Windows

How to Measure Double Hung Replacement Windows

If you need to replace a double-hung window, you first need to measure the existing window opening to ensure proper fit of your new unit. If the measurements are incorrect you may end up with a replacement window that you are unable to use. Following the proper steps and ensuring accuracy are essential to getting the correct measurements.

What You'll Need:



  • Measuring tape



  1. Start this project on the inside. From the inside of your home, position the end of your measuring tape on the outside middle portion of the window frame. Begin to slowly move it along the width of the window then take the measurement at the other end of the window frame. Double-check your measurement to ensure accuracy.

  2. To complete this step you will need to go to the outside of your home. Using your measuring tape again, repeat the above process to measure the length of the window frame as well. Position the end of the measuring tape right at the middle upper edge of the window frame on the outside of your home. Pull the measuring tape downward toward the lower outside portion of the frame and take the measurement. Doubl-check your measurement to ensure accuracy.

  3. You will use these measurements to order replacement windows. Its important that you ensure your measurements are correct so that you are not stuck with replacement windows that you are unable to use because they are the incorrect size. Provided your measurements from the outside to outside for both length and width are correct you will receive the correct size window for your replacement.