My Father's house has plenty of room; if that were not so, would I have told you that I am going there to prepare a place for you? (NIV)

In My Father's house there are many dwelling places (homes). If it were not so, I would have told you; for I am going away to prepare a place for you. (AMP)

In my Father's house are many mansions: if it were not so, I would have told you. I go to prepare a place for you. (KJV)