How to measure for replacement windows from inside?

When you’re replacing window , it’s important to get the right size. Replacing windows that are too small will leave your home uncomfortable and leave you feeling the cold. And, replacing windows that are too large will leave you wasting money. Fortunately, it’s easier than ever to get an accurate window size measurement.

How to measure for replacement windows with transom?

If you have a “transom” or “overhang” (the area of the windows over the front door), you’ll need to add this to the overall window length. Transom windows often have a finished width of about 2-3/8″, and the overall length should be at least twice that amount. If you have a sliding barn door, add the amount of the sliding on top of the visible window length.

How to measure for replacement windows from inside a double hung window?

You can measure from inside a window that has two sashes by holding a ruler against the window sill, then lining up the window with the marks on the ruler and transferring the window measurements to your plan. If your window has two levels of sashes, you’ll need to measure both levels to get accurate window measurements.

How to measure for replacement windows with sliders from inside?

If you have sliding windows, you’ll want to add some extra space when you measure. The window itself should be at least 1/8″ above the floor and the gap between the windows should be at least 1/2″. You should also add extra space between the sash and the wall, especially if you have a window with a decorative wood molding around it.

How to measure for replacement windows without a ladder from inside?

If you have a standard window with an inside measure of 2.5-3.5 inches, you should be able to hold a string level at the top and bottom of the sash and read the measurement on the wall and add or subtract the thickness of the window frame (roughly 1/2″ to 1″). The same goes for a sliding window.