How many shutter panels do I need for each window? For the most part, the larger the window, the more shutter panels you’ll want. Our recommendation is to use one panel for windows up to 26 inches wide, two panels for windows up to 50 inches wide, and four for windows up to 98 inches wide.Single wide panels are not as room-friendly as multiple panels. Sometimes, wider panels won’t fit flush against the wall because of their width. Two smaller panels resolve that.For any windows that you’ll open or shut often, you’re usually better off with multi-panel shutters, since they’re easier to open and have additional support from the frame when you do open and close them.