How many shutter panels do I need for each window? Typically, the the large the surface area of your window, the more shutter panels you’ll need. The most ideal layout 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. Sometimes, wider panels can’t fit flush against the wall due to their size. Multiple smaller panels don’t have that same issue.For those windows that you may want to open or shut often, you’re usually better off with multi-panel shutters, since they’re easier to open and have more support from the frame when you do open and close them.