Hello,

I am wiring the new addition to my house. It is two floors above ground and a basement below. Am I allowed to drill between floors and run Romex from one floor to another... using drilled holes, or do I need to have a conduit chase between floors for the romex to pass through. I have never seen anyone use conduit, but from what I am reading in the code book it says nm-b (romex) can not run between floors. Is this correct or am I not reading it correctly?

You are reading something incorrectly.
You do have to use firestopping material (caulk or foam) in holes drilled between floors or in spaces where firestopping is required by building codes.