[BowDown]

To officially rewire a house w/a basement does an electrician cut out the drywall to remove old wiring and secure new wiring... or would they leave remnants of the old wiring in the walls, and just poke up from the basement to each outlet and switch?

 

[kbsparky]

Old wiring that is readily accessible should be removed.

It is not required to cut open the walls and ceilings to remove abandoned wires.

 

[Scuba_Dave]

Yup, & new wire is only secured if it's an open area
So you do snake it from below or above (attic)