In this video, we're talking about stock sizes of Window Blinds, not custom sizes. Stock sizes come in various widths: As narrow as 10" and as wide as 107".

All stock sizes measure 1/2 inch less than their stated size. For example, the headrail and slats of a 36"x72" mini blind measure 351/2". Therefore, if your window opening is 36" wide, a 36" wide blind will be a great fit. It will leave only 1/4 of an inch of space on each side.

If your window opening is 351/2", you should choose a 35" size blind. It will measure 341/2" wide and you will have 1/2" space on each side. This is still quite normal.

We do sell some sizes which are "half" sizes such as 28.5x72. The headrail and slats of that size will measure 28 inches.

When mounting your blinds outside of the window box, as shown in this video, the sizing is much more flexible. You can buy your blinds an inch or more to cover the whole window. We call this "outside" mounting.

In this video, we also talk about the brackets. The bracket styles have changed to accommodate the new cordless style blinds. Therefore, if you are going to replace existing blinds from your windows, you will probably need to uninstall your old brackets and replace them with the new brackets which come with your new blinds.