The first step in measuring a window is to use the right tool. You will need a steel tape measure. Cloth tape measures can bow and sag and should not be used. You will be measuring with a steel tape to the nearest 1/8”.
You should measure each window individually and record the measurement as width x height. This is the standard way of communicating measurements in the industry. You will need to decide first if you want inside mount blinds or outside mount blinds.
MEASURING FOR INSIDE MOUNT BLINDS AND SHADES
Inside mount blinds are installed inside the window casing. They may need a certain depth in order to sit flush with the casing. Make sure the blinds that you pick out will fit inside your casings.
To measure for inside mount blinds you are going to use the steel tape to measure from left to right in three places on the window. Measure from inside edge of casing to inside edge of casing. Record the smallest measurement to the nearest 1/8”. Do the same for the height of the window measuring from top to bottom.
MEASURING FOR OUTSIDE MOUNT BLINDS
Outside mount blinds are installed outside the window casing. They cover the window completely and are used to make it look larger or hide an unsightly window. Again, you are going to measure the window with a steel tape.
First measure the width of the window from outside edge of casing to outside edge of casing. Add 3” onto this measurement for an overlap of 1.5” on either side. Next, measure the exact height to be covered, normally from the top edge of the window casing to the bottom edge or the sill.
MEASURING FOR ARCHED WINDOWS
Arched windows are tricky to measure. This is because they are nearly never perfect arches. If they are the measurement is easy. You simply record the width of the window base and the half that as the height. If they are not perfect semicircles then it is best to make a paper template to send to the blinds company.
CONCLUSION
In order to achieve a good impression in your home you must have professional looking window treatments. Professionalism is a byproduct of taking your time and measuring right in order to custom fit blinds and shades to your home. With these tips in hand you should be able to confidently measure your blinds and get your order processed quickly and correctly.