Learn the differences between inside and outside mount window treatments including appearance, light control, privacy, and functionality to determine the best fit for your home.  When selecting custom window treatments, one of the first decisions you'll make isn't the fabric or color—it's how they'll be mounted. Choosing between an inside mount and an outside mount may seem like a small detail, but it can significantly impact your home's appearance, light control, privacy, and the overall performance of your shades, blinds, or shutters. Here's what you need to know before making your decision.