A height adjustable toilet assembly for a person with a disability includes a commode that comprises a bowl. A plate is coupled to a bottom of the bowl. A base is coupled to a floor of a structure. A pump is coupled to the base. A hydraulic cylinder is coupled to and extend perpendicularly between the base and the plate. The hydraulic cylinder is operationally coupled to the pump. The pump is positioned to actuate the hydraulic cylinder to selectively extend the commode from the base. A bellows is coupled to and extend between a perimeter of the base and a circumference of the bottom of the bowl. The bellows is positioned to extend as the commode is extended from the base.