Dumbwaiter models are usually installed between the garage level and the kitchen. To determine where dumbwaiters can be added, you must consider the available space for a dumbwaiter, where’s it needed and design.The dumbwaiter cost is somewhat similar to about half the cost of a small residential elevator. The reason for this is that an enclosed shaft is required, a lifting device motor, and rails to have the cab (dumbwaiter) ride on the wall. Dumbwaiters are small freight elevators or lifts intended to carry objects rather than people. Dumbwaiter found within modern structures are often connected between multiple floors. When installed in restaurants, schools, kindergartens, hospitals, retirement homes or in private homes, the lifts generally terminate in a kitchen.