electricity may cost you $200 to $300. Because wahser and dryer use lot of electricity and on 240V. A separate line from break box is needed.
Plumber is trick to say. If there is a sink, and you put washer beside it. it may cost you $300 dollar. If there is not and you have to break the floor to find sewage line. It would cost you more than $500. And ususally you may put a sink near washer and dryer. It costs you too.