How many shutter panels do I need for each window? Usually, the bigger your window is, the more shutter panels you’ll want on it. The most ideal layout is to use a single 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 aren’t as user-friendly as two separate panels. Sometimes, wider panels can’t fit flush against the wall due to their width. Two smaller panels fix that.For any windows that you may want to open or shut often, you’ll be better suited with multi-panel shutters, since they’re easier to open and have additional support from the frame when you do open and close them.