Whether you want to replace an existing door or cut a hole in a wall and install a new door, there is a wide range of door styles and types to choose from. Before you replace a door with another of the same type, consider other possibilities. For instance, you may be able to replace a standard exterior door with a larger patio door. A pocket door can sometimes replace a regular interior door and save space at the same time; a 3-foot-wide door to a laundry room can often be widened to 6 feet or so with bifold or sliding doors.