Like many other finishing touches, the window and door casing serves both aesthetic and functional purposes. Casings help to cover the gap or space between the drywall and the window or door frame to create an aesthetically pleasing final look. Selecting window and door casing profiles is all about choosing a style that matches your home’s aesthetic. For example, you don’t want to choose an ornate door casing moulding in a modern farmhouse, just like you wouldn’t want to choose an understated window casing in a Victorian-style home.