How many shutter panels do I need for each window? For the most part, the bigger your window is, the more shutter panels you’ll need. Our recommendation is to use one 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 room-friendly as multiple panels. Sometimes, wide panel shutters won’t fit flush against the wall due to their width. Multiple small panels solve that problem.For windows that you may open or shut often, you’ll be better off with multiple panels, since they’re easier to open and have additional support from the frame when you do open and shut them.