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