An expandable habitation unit includes a main frame and a main floor with a habitation area. A rear module with a floor is located over a rear portion of the floor. The rear module floor is connected to the main frame to allow limited movement over part of the main floor. A side module has a floor located over one side of the main floor. The first side module floor is connected to the frame to allow limited movement over one side of the main floor. Another side module has a floor located over a second side of the main floor. The second side module floor is connected to the main frame to allow limited movement over the second side portion of the main floor. The modules can move along their limited paths of travel to vary the size of the habitation area.