Basic VLAN question in a multi-storey building

Hello,

I want to design a network for a multi-storey building (~40 PCs per floor + laptops using wireless). I've currently got a Layer 2 switch for each floor.

I've been looking into VLANs and am wondering whether it's standard practice to assign a VLAN for wired traffic, and another VLAN for wireless, resulting in 2 VLANs per floor. Also, if the PCs will run video conferencing software using VoIP, would you recommend another VLAN for that too?

Would appreciate any clarification - thanks!