In 2013, an excavation near Vernègues (Bouches-du Rhône), “ Cazan Le-Clos-du-Moulin”, revealed a large occupation site dated to the Middle Neolithic (Late Chassey culture). The area excavated is located in the centre of a small valley which joins the valley of the Durance just to the north. While no occupation layers were uncovered during the excavation, over 600 archaeological features were preserved. The site contained many pits, five wells, and a concentration of twenty burnt stone combustion features, which are typical of this period. However, the most notable aspect of this site resides in the discovery of many postholes and foundation pits which trace the outline of at least fifteen architectural structures. These are the first buildings recorded for the Late Chassey in the south of France. They consist of ten structures which were implanted on well preserved postholes. These structures repeat the same overall plan which can be considered as an architectural type. It is composed of around a dozen posts forming two aisles, with a probable ridge beam extending beyond the ridge purlin. Two smaller posts in front of the southern gable probably indicate the location of an entrance. All of these buildings follow a plan which was clearly collectively predefined ; all the structures are orientated NW-SE, which coincides with the prevailing wind in the valley. Moreover, the distribution of these postholes and pits indicates that several houses were completely rebuilt in the same location, up to two to three times. These first results presented here renew the debate and research concerning the nature of occupation in this landscape during this period. It suggests that the Chassey population was linked to this place and the surrounding landscape, which they occupied and reoccupied several times over a period of 300 years.