Not everyone screams in labour Tadpole, I didn't, I never even shouted, but once in that experience you really won't be thinking 'who can hear' and you're going to feel more comfortable at home, stay at home and never mind the geography. We too are in a ground floor flat, and people walk by outside, but that thought never crossed my mind. But the maternity ward is an option for you, so if things don't feel comfortable on the day you can always transfer there, you have lots of options, very best wishes