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. Our recommendation is to use a single 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 user-friendly as multiple panels. Sometimes, wider panels won’t fit flush against the wall because of their width. Multiple small panels solve that problem.For windows that you might open or shut regularly, you’re usually better suited with multiple panels, since they’re easier to open and have additional support from the frame when you do operate them.