Its rectangular or trapezoidal floors with length of 12m and largeness from 3 to 6 m., had a stone base. The walls, realized with adobe and timbers, had a mud and lime plaster and they were covered with wood and vegetal roof. They have three large rooms: the hall, used to make to hand-crafted activities, with a trapdoor in the floor to go to an underground room, where feed was kept; a central room with the fireplace and continuous benches, where people ate and slept; a little pantry to keep feed and tools. They had also a little rectangular yard with roofing for the animals. Considering the space of the city and the number of houses you can gather that the city had a population of about 15,000 inhabitants. On the other hand, in the beginning of Celtiberian wars (153 BC), Roman historians talk about 8,000 warriors and in the end on about 4,000 (133 BC). If we consider that two-third had a family (4 members), Numantia would have had a population of 21,200 and 10,400 inhabitants. The two figures could be combined making a difference between the inhabitants of the city and the ones of the territory.