I suspect that the "void" we call outer space, has always existed, because the void is nothingness and you can't create nothing because it is "nothing". It's just empty "space" to put things in.
Empty space is something to put things in. It is not known if ES existed before the bb. I think that it did not exist before the bb but came into existence as part of our universe because it is part of our universe..(Just my guess)
Suppose you were to remove all forms of matter and energy from the universe, could space exist on its own or does it need something?