How many shutter panels do I need for each window? Typically, the larger the window, the more shutter panels you’ll need. The most ideal layout 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 are not as user-friendly as multiple separate panels. Often, wide panel shutters won’t fit flush against the wall due to their size. Multiple small panels don’t have that problem.For those windows that you may want to open or shut often, you’re usually better suited with multiple panels, since they’re easier to open and have more support from the shutter frame when you do open and close them.