We are buying a house, and love the entire layout except for the master bath. There is ample room in the bathroom, but the configuration does not make good use of the space. Currently there is an extremely long vanity area and a large toilet area on one wall, and a tiny 3 ft by 3 ft shower on the opposite wall between his and her closets. We want to keep the separate closets. What we would like to do is move the toilet to the shower area, shorten the vanity and make a large tub/shower combo where the vanity and toilet is currently. We will be working with a slab foundation, and will be hiring a professional plumber, but we want to get an idea if our plan will even work. Can a shower drain be converted into a toilet drain, and vice versa?