Depends upon the size of the table and the size of your cue....
Try here
http://www.legacybilliards.com/submenu/faqs.htm

Here is a link that might be useful: Legacy FAQs

I sort of grew up with a pool table in more or less an efficiency apartment .. 12 foot wide room wasnt enuff to avoid banging on the walls. 8 foot ceiling wasnt enuff to avoid blue chalk marks up there either.