How many shutter panels do I need for each window? For the most part, the the large the surface area of your window, the more shutter panels you’ll need. The most ideal layout 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 aren’t as user-friendly as multiple separate panels. Often, wide panel shutters can’t fit flush against the wall because of their size. Two smaller panels don’t have that same issue.For any windows that you may want to open or shut often, you’re usually better suited 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.