Abstract: A modular, self-supporting elevator hoistway system and method includes stackable cages to replace structural building hoistways. Vertical corner columns, extending upward from an adjustable footing anchored in the elevator pit, form planar sides surrounding the hoistway. Fireproof sheeting between the columns isolates the hoistway interior from the rest of the building. Adjustable sill supports extending from adjustable horizontal cross members allow precise alignment with building floor doorways. Vertical elevator guide rails coupled to cross members cooperate with guide shoes on elevator cars to deter horizontal oscillations and smooth vertical motion of the car. A hoist beam atop the uppermost cage may support of an elevator car during maintenance. Cages may be assembled separately and installed in modular segments as the height of the building progresses, and may be erected before construction of building floors, allowing floors to be built to match hoistway sills.