How many shutter panels do I need for each window? Usually, the bigger your window is, the more shutter panels you’ll want on it. Our recommendation 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 room-friendly as multiple separate panels. Sometimes, wide panel shutters won’t fit flush against the wall because of their width. Multiple smaller panels don’t have that same issue.For windows that you’ll want to open or shut regularly, you’ll be better suited with multi-panel shutters, since they’re easier to open and get more support from the shutter frame when you do operate them.