How many shutter panels do I need for each window? For the most part, the bigger your window is, the more shutter panels you’ll need. Our recommendation is to use one 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 aren’t as user-friendly as multiple separate panels. Often, wider panels won’t fit flush against the wall because of their size. Multiple smaller panels don’t have that same issue.For windows that you’ll want to open or shut regularly, you’re usually better suited with multi-panel shutters, since they’re easier to open and have more support from the frame when you do open and close them.