How many shutter panels do I need for each window? Usually, the larger the window, the more shutter panels you’ll need. 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 two separate panels. Sometimes, wider panels won’t fit flush against the wall because of their width. Multiple small panels resolve that.For windows that you’ll want to open or shut often, you’re usually better off with multi-panel shutters, since it’s easier to open them and they have better support from the frame when you do open and close them.