How many shutter panels do I need for each window? Typically, the bigger your window is, the more shutter panels you’ll want on it. Our recommendation is to use a single panel for windows up to 26 in. wide, two panels for windows up to 50 in. wide, and four for windows up to 98 in. wide.Single wide panels aren’t as room-friendly as multiple separate panels. Often, wider panels can’t fit flush against the wall because of their size. Multiple small panels solve that problem.For those windows that you may want to open or shut often, you’re usually better suited with multi-panel shutters, since it’s easier to open them and they get more support from the frame when you do open and shut them.