Whats the best number of shutter panels for each window? Typically, the the large the surface area of your window, the more shutter panels you’ll want. The optimal design is to use a single panel for windows up to 26 in. wide, two panels for windows up to 50 in. wide, and four for windows up to 98 in. wide.Single wide panels are not as room-friendly as multiple panels. Often, wider panels can’t fit flush against the wall because of their width. Multiple smaller panels fix that.For windows that you might open or shut regularly, you’re usually better suited with multiple panels, since it’s easier to open them and they have better support from the shutter frame when you do operate them.