If you believe in Feng Shui, you have to ask a Feng Shui master to place it for you, because the placement of Feng Shui stones requires the use of Luo Geng (compass) to determine the location and direction.
The best stone for house-building is Taishan stone. I don’t know if you are talking about Taishan stone. If it is big, you happen to have a courtyard. Just put it on the left side of the door in the courtyard. If it is not big, Place it directly opposite the entrance.