At the age of 16, Schneider had his first solo exhibition entitled, Pubertäre Verstimmung, at the gallery Kontrast in Mönchengladbach. Since the beginning of the 1990s he has worked with rooms in galleries and museums. He conceives the rooms as three-dimensional, sculptures that can be walked through, which oftentimes hide or alter the existing gallery- and museum rooms; the rooms he works with are existing rooms he finds in different dwellings or domestic buildings. In 1985 he began dismantling and rebuilding rooms in an apartment building in Rheydt, which he entitled, Haus u r.

Since 1985, Schneider has been working elaborately on the house on Unterheydener Straße in Mönchengladbach-Rheydt. The “u r” refers to Unterheydener Straße und Rheydt. Gregor Schneider created replicas of the existing rooms by building complete rooms inside of other rooms each consisting of walls, ceilings and floors. These doubled rooms are not visible as rooms within rooms to the viewers. Additionally he slowly moves the rooms out of sight by employing machines that push ceilings or complete rooms. Hollow and interspaces are the results of the form of the installations. Some rooms become inaccessible, because they are hidden behind walls and some have been isolated by concrete, plumbing, insulation or sound absorbing materials. Via outside fixed lamps, different times of the day have been simulated. The rooms are numbered consecutively (u r 1 -) for clear distinction. At the beginning the originals rooms have been all areas of a house: a bedroom, a coffee room, a lumber-room, a kitchen, a corridor, a cellar. Since the middle of the 1980s visitors of the Haus u r have been reported as having had frightening experiences inside the house.