My guess is that older homes in the northeast will have an issue not with adding the outlet but upgrading from 100amp to 200amp service. I was quoted $10k for that upgrade. I had to decide between getting an EV and getting a heat pump. Decided on the heat pump, which I’m very happy with — it’s saving me thousands on heating oil.
Can confirm. I have an 1898 house in the Northeast. Just upgraded from 100A service to 200A service for $3900. I didn’t own the house at the time, but I believe it went from 40A to 100A in 1985.