What types of residential elevators are installed in St. Louis homes?
The three most common residential elevator types are shaft-based hydraulic elevators, machine-room-less (MRL) traction elevators, and self-supporting pneumatic (vacuum) elevators, each suited to a different structural situation.
Traditional hydraulic elevators need a framed shaft and typically a small equipment closet for the pump unit, which works well in new construction or a home with room to sacrifice a closet on each floor. MRL traction elevators cut the equipment-room requirement but still need a full shaft. Vacuum elevators skip shaft framing entirely — the cylinder is self-supporting and only needs a level, load-rated floor opening — which is why they're popular for retrofits into existing St. Louis two- and three-story homes where opening walls for a shaft isn't practical.