According to an example embodiment, an elevator control system is provided, the elevator control system comprising an elevator controller for controlling movement of one or more elevators of an elevator transport system between one or more floors of a building under construction; and a scheduling system for maintaining a transport reservation schedule pertaining to said one or more elevators, wherein the transport reservation schedule comprises one or more transport reservations that comprise at least a first transport reservation that defines at least a first reserved transport time period, a first origin floor, and a first activation code, wherein the elevator controller is arranged to: control an elevator allocated to serve the first transport reservation to arrive at the first origin floor by the beginning of the first transport time period, and control, during the first reserved transport time period, said elevator allocated to serve the first transport reservation to move to a destination floor in response to receiving an activation code that matches the first activation code.