How many shutter panels do I need for each window? Typically, the the large the surface area of your window, the more shutter panels you’ll want on it. The optimal design 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 are not as user-friendly as multiple panels. Oftentime, wide panel shutters can’t fit flush against the wall due to their width. Two smaller panels don’t have that same issue.For those windows that you may want to open or shut regularly, you’ll be better off with multiple panels, since they’re easier to open and get additional support from the shutter frame when you do operate them.