Window blinds using an Inside Mount
Inside mounted window blinds require more precise measurements, so always use a metal tape measure or yardstick to ensure the accuracy of your measurements.
First measure the window opening on the diagonals. If the two diagonal dimensions are not identical, the window is out of plumb (e.g. it’s skewed).
This is frequently the case, so you instead may want to use an Outside Mount if maximum window coverage for privacy and light blockage is an important consideration.
Measuring to ensure that window is plumb
Result of using an Inside Mount on an out-of-plum window
Step-by-Step Instructions
First measure width in three places
- Since width is listed first when ordering window treatments, always measure the width first to prevent mixing up the two measurements.
- Measure the width of the window opening at the top, center, and bottom of the window.
- Record all measurements right away, before you forget.
- Take the smallest width measurement, and round it down to the nearest 1/8 inch. This will be your WIDTH measurement.
Measure height in three places
- Measure the height of the window opening at the left,center, and right of the window.
- Record all measurements right away, before you forget.
- Take the smallest height measurement, and round it down to the nearest 1/8 inch. This will be your HEIGHT measurement.
Repeat the process for each window, even if they are supposed to be the same size – they probably aren’t.
