How many shutter panels do I need for each window? Usually, the larger the window, the more shutter panels you’ll want. The most ideal layout is to use one 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 panels. Sometimes, wider panels won’t fit flush against the wall because of their size. Multiple small panels solve that problem.For windows that you may want to open or shut often, you’ll be better suited with multi-panel shutters, since they’re easier to open and have more support from the frame when you do open and shut them.