Lights, conduit, and old homes

Hello. I'm looking at an old craftsman style home (built in 1926) to flip this winter. Before I do so, I want to make sure I can bring the place up to code. Virtually none of the rooms have a switch to control the lights. You have to reach up to the fixture & pull the chain. Can an electrical contractor connect a switch to the light fixtures in these rooms via some sort of conduit installed on the wall/ceiling surface or does the wiring have to be put behind the wall to meet code?
Thanks for any help you may be able to provide.

Jeff

I am closing this thread, in accordance with the Forum rules. This Forum is intended to assist professional electricians, inspectors, engineers, and other members of the electrical industry in the performance of their job-related tasks. However, if you are not an electrician or an electrical contractor, then we are not permitted to help you perform your own electrical installation work.