The few studies on modern and contemporary housing in the province of Almeria have focused their interest on the most successful urban and building developments, having overshadowed other residential episodes without which the local reality is perceived misleading and incomplete, as the case of the underground architecture, which requires deepening its evolution and scope in the last century. The methodology followed is based on consulting census, inventories, registers, newspaper reports, files of Public Administrations, Rural Development Associations and other organizations, in addition to ground reconnaissance with an enough representative sampling of visits and interviews. Thus, after contextualizing the phenomenon, the results obtained allow to deduce both its territorial and social relevance as the slow, but progressive, change of consideration in recent decades in favour of a habitat that has been claimed as an intrinsic part of the heritage and cultural legacy.