I've wondered about this. In my situation, I don't have reasonable charging facilities at my driveway, and I live in a suburban subdivision so there isn't anywhere nearby I could use public chargers. I think I would have to:
1) Upgrade the electrical service to my home and the service panel ($?).
2) Run electricity to my detached garage as the charger will want to be inside for best results (~$3k estimates).
So I'm going to guess ~$6k just to get my house ready to charge an EV (not including the EV charging unit).
I suppose I might be able to get away with upgrading the exterior outlet nearest the driveway, but then there's cords living outside and freezing to the ground in the winter, which seems annoying enough to make me re-think having an EV.