First, enough large stones needed to be collected. Presumably this happened in the neighbourhood where the megalithic tomb was planned. Researchers presume the stones were not moved over distances larger than 5 kilometres. To facilitate transportation, tree trunks were used as rollers or sleds could be used in winter time to move the boulders over the frozen subsoil. Different ideas exist on the actual building of the megalithic tombs. According to the first theory the carrying stones were erected first against a core of soil.
The spaces between those stones were filled up with smaller rocks after which the whole was was covered with a hill of soil. Then, the covering stones were dragged in position. Finally, the soil was excavated again through the entrance and the floor was covered with smaller boulders. Research of the covering hills in the Netherlands, however, revealed that they were usually not high enough to pull the covering stones on top of the carrying stones. Another possibility would therefore be that the covering stones were placed on an earthen or wooden platform, after which the carrying stones were installed underneath.
This way, the carrying and covering stones would fit better to each other. A third possibillity is that the megalithic tombs were built per trilithon (two carrying stones with one covering stone on top). The covering stone would then be pulled on top of it by means of a wooden slide.