[villagetinker]

To be legal, the existing wire (cable) would need to be removed and a new one installed, or it would need to be spliced, and if spliced, then you must have access to the splice, so you will still have a cover plate at the current location in the floor. I point this out since it mat not be possible to pull out the existing cable, depending on the number of bends in the conduit. I do recall some people just abandoning these floor mounted receptacles, but having the cable disconnected at the breaker box, and in your case, the new flooring installed over the filled in hole. This may be your best and cheapest solution, if you can live without the floor receptacle.

I have some experience with cable in conduit, and if the original construction used wide sweeps, then to may be possible to replace the cable, if they used 90 degree fittings or very tight sweeps, you are probably out of luck. I think this is why the electrical contractors are backing away.

Also, I am guessing the expansion may have been after the fact, so the original location may have been fine.

Hope this helps, and feel free to send me a PM if you would like to discuss further.