Towards the end of the Late Stone Age, about 2000 BC, the dwellings were large and rectangular with a floorage of up to 50 square meters.
These so called "Gressbakken houses" had two fireplaces along the length axis and also several entrances, up to four – one in each wall. The many entrances separate the Gressbakken houses from other Stone Age dwellings. In connection with these entrances there have often been small annexes. In the walls and floors of some of the Gressbakken houses there have been found human bones.