The ISO 4190 standard for suggested values in sizing the lifts.
It is better if the lifts in the building physically together and not individually throughout the building. Such formation and group management system ( multiplex ) bring less waiting time and fewer problems when some of the lift breaks down.
Care should be taken that the spaces in front of elevators large enough to hold the passengers. In residential buildings must be at least equal to the surface area of the cabin or higher . In the case of commercial buildings, but it is best if that space is so big that it can put the number of people equal to the maximum load capacity for installed elevators and provides a protrusion of an equal number of people for elevators . The area required for one man, the ellipse dimensions of 600 x 450 mm