External spiral stairs are not that common. However, that makes them even more special and unique. The projects that have planned spiral stairs, usually turn into a real architectural gems. The concrete spiral stairs make the buildings or the houses far more extravagant and classier. Although they seem more complicated for building, the newest technology helps a lot. If you have a chance for owning a house with such stairs, we recommend you not to hesitate and make them! Your house will look much more expensive and attractive.