How many shutter panels do I need for each window? For the most part, the the large the surface area of your window, the more shutter panels you’ll want on it. The most ideal layout is to use one panel for windows up to 26” wide, two panels for windows up to 50” wide, and four for windows up to 98” wide.Single wide panels are not as room-friendly as multiple separate panels. Often, wider panels won’t fit flush against the wall because of their size. Multiple smaller panels solve that problem.For windows that you might want to open or shut often, you’re usually better off with multiple panels, since they’re easier to open and have additional support from the frame when you do open and close them.