New work areas
A new desk row, a treatment room, or a counter that was not there last year still needs a path back to the network. Before cable is pulled, it helps to know which seats need a wired connection, which can stay on Wi-Fi, and where the cabinet is.
What is already there
In an existing space, start with the network and the layout you have now. Where people sit, where the switches and firewall live, and what a change would disturb. What gets reused is decided with you, not assumed.
Moves, switching and Wi-Fi
A drop that never meets a switch port, or Wi-Fi asked to cover a room that was meant to be wired, just creates the next problem. Office moves belong in the same discussion: phones, workstations and the network path, before the furniture arrives.