I was extremely nervous because I need this vanity to live touching an exterior wall in my small powder room bath therefore I need to plumb into the floor.  I was very happy when I found that the bottom drawer does not go all the way to the back and THERE IS ROOM to plumb through the bottom of the vanity.  I hope this review can help others who have this question.  You can plumb through the back of the vanity into the wall or through the bottom of the vanity into the floor.  With that said, this little vanity is beautiful and looks to have good construction.  I purchased the natural stone top and it looks really nice.  I live at the top of a giant mountain way back in the woods, and the delivery crew was awesome.  They obviously couldn't get all the way to my driveway so they were able to meet up with me closer to the only town in the area.  Very happy for the delivery crew and the vanity itself.