I recently put in an offer on on a house that had an updated electrical panel (200 amps) but a majority of the outlets in the house were of the older two pronged variety. I have not opened up any outlets to see what type of wires were in there i.e. ground wire.
What am I looking at cost wise if there is only black and white and no ground wire in the boxes (probably 5 on first floor and 5 on second floor)? Also, what would I be looking at if there were three wires upon closer inspection? Thanks for your help!