I think vampires have to be invited in, not elves.
They have to be invited in before they can enter. So don't invite any strangers in your house until you know that s/he isn't a vamp.
If you are invited, you can. However if she or her parents say you may not enter, then you may not enter.
It is said that vampires can not enter a private domain (so no problem entering a library or other such places) without an invitation because of their lack of souls.
As revealed in "Goblet of Fire", by house elves.
depends on the type of vampire in question
Be invited, or so the myths say.
House of the elves
House elves clean. I dont think there are elf elves but like yah
The only house elves mentioned are Dobby, Kreacher, Winky and Hokey.
Elves Hide somewhere where they think humans will never look.
My Haunted House - 2013 The Invited was released on: USA: 2014
Douglas was invited to the White House to discuss grievances of the black soldiers.