Are you referring to the OP? If so, it was a 100% contractor build out with a little more work than an average bath redo.
either way there are a ton of variables. Brand of fixtures, brand of tub, you could spend a couple grand on the tub alone if you are going for a specific look, marble vs ceramic tile, cabinet build type and materials, type of wood used for the flooring and so on. Throw in a steam shower, heated floor and towel racks and it adds up.