Aboriginally, the Seri were nomadic. Their movements reflected both seasonal and fortuitous changes in the food supply and in the most critical commodity, fresh water. People moved among temporary camps as resources shifted. Camps were occupied for up to several weeks and might be composed of a single nuclear family or as many as fifteen families. Although the Seri now reside in two permanent villages, the population of each fluctuates greatly as people move freely between them. Some traditional camps are still used during fishing or foraging expeditions.
Most activities were conducted outdoors, and shelters served primarily as windbreaks and for storage. Houses were fabricated of ocotillo branches and resembled a Quonset hut or a simple rectangular box. They were covered with brush, seaweed, or anything handy. Housing today in the two villages is more substantial. Here the Seri have built both Mexican-style jacales of wattle and daub, and small wood-frame structures. During the 1960s and 1970s the Mexican government constructed cinder-block bungalows for the Seri.