Replacement windows are a great investment in the value of your home or business. Knowing how to measure for replacement windows is a critical step in the process and must be done correctly. In this quick tutorial, we’re going to walk you through the steps you should take to ensure you get the correct measurements and your replacement process goes smoothly.
Step 1
Measure your existing window frames to make sure they are square. (All 4 corners are 90 degrees)
With a tape measure, on the inside of your existing window, measure from the top left corner to the bottom right corner of the window (where the window trim meets at the corner). Mark this measurement down.
Now, measure from the top right corner to the bottom left corner. If this measurement is within ¼” of the first measurement you are good to proceed. If it is not within ¼” you will need to order a new construction window.
Step 2
Measure the Window Width
Using your tape measure horizontally, measure the inside of the jamb, left to right. For better access to the jamb, open the window sash and measure. The jamb is the vertical board that the outer frame of the sash slides on when you open and close the window. Measure the width at the bottom, middle and top of the window. Use the smallest measurement as your window width.
Be sure to measure each window individually even if they appear to be the same size.
Step 3
Measure the Window Height
Using your tape measure vertically, measure from the highest point of the sill to the top of the window opening. The sill is the horizontal piece that the bottom sash rests on. Measure at each side and in the middle and use the smallest measurement as your window height.
Be sure to measure each window individually even if they appear to be the same size.
Some things to note.
Before ordering replacement windows, make sure the wood frame surrounding your windows are in good condition. If they have any rot or water damage you will need to order new construction windows.
Always measure for replacement windows from the inside.
Window sizes are always presented as width x height.
Never include any window trim in your measurements.
Call us if you need help!