Technologically speaking, stone constructions have been known in Central Europe since the Early Iron Age. But in those times stone was rather used for city walls than ordinary houses, because of its limited availability. A central power, like a chieftain or a palace, for the coordination of the different working stages is required, also specialised workers, a transportation network and a stable food supply. Only in the big, well organised cultures, like Rome or Babylon, the administrative structure had reached a level high enough to enable stone buildings on a larger scale. Since in prehistoric times a large part of the people had to work on their farmsteads, they didn’t have the time, the organisation and the money to gather together workers and material. Wood , on the other hand, was available almost everywhere, at any time. In contrast to stone, trees have got the huge advantage of growing again when cut down, and are much easier to work than stone. Therefore, building a wooden house is much easier, faster and cheaper.