How many shutter panels do I need for each window? Typically, the larger the window, the more shutter panels you’ll want on it. The optimal design 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 aren’t as room-friendly as multiple panels. Oftentime, wider panels can’t fit flush against the wall because of their size. Two smaller panels don’t have that same issue.For windows that you may want to open or shut regularly, you’re usually better off with multi-panel shutters, since it’s easier to open them and they have better support from the shutter frame when you do operate them.