When you are choosing External Doors for your house, you may be surprised at how many options there are in the marketplace. While it is fun to visit Internet sites and home improvement centers in your hometown, these locations may only be a starting place for finding an exterior door design that is durable, beautiful and provides good security for your home.External doors come in various construction materials. There are steel doors, wood solid core doors, aluminum doors–with or without extra insulating factors. Doors for the exterior can be solid, or can use various types and number of windows. You can choose double doors or single doors, and you may surround doors with one or more windows.