I have an old house, so it may not be applicable, but I tiled up to a 42" height. I used 42 because that was the ht. of an old chair rail or towel bar rail that once existed in the bathroom. It turned out that it was just the right height for the medicine cabinet I picked out; any taller and I would have needed to turn the tile or stop the chair rail @ the cabinet. My ceilings are 7'9".

Well now if you stop worrying about every little freaking thing, what happens to us??? We're unemployed ;-)

I'm trying to picture your layout but honestly it isn't clear to me. Generally I like to see something other than a 50/50 split but there are other things that come into play - how does that 50/50 or 33/66 relate to the finished height of your vanity counters, to the windows (if any) either at sill or apron height. I like continuity, too and like to see some relation to other horizontal lines in a space - expecially a space like a bathroom. But that doesn't mean everything has to end at the same height, just that you need to put those other lines into the thought process so you don't end up with staggered and unrelated horizontal lines all through the space. Clear as mud?

Ours is 4 ft. in the bath because 5 ft. would have interfered with fixtures, etc. It's a personal thing and well as an architectural choice. I love wainscoting and all heights look good to me!! Only thing to remember is you don't want to go too high in a very small room or it will close the room in, unless of course you're going for that cacoon feeling.

Som's looks perfect because it comes right up to the bottom of the mirror and allows the perfect placement for the towel bar.

Re: going too high with wainscoting in a small room. You would think that it would make a room look more closed in, but in my tiny 4' x 6' windowless half bath, the wainscoting is about 2/3's of the way up the wall (ceilings are only 7' 6" tall), and I think it makes the room look bigger. I think it's because the wainscoting is white, and the smaller portion of the wall is dark. If the colors were reversed, then, yes, I think it would make it look smaller.

Thanks everyone. Looks like there is a reasonable argument for the 50/50 split if it makes sense in the context of other horizontal lines. I think I should go and see where the window sill will be. There won't be any wainscoting on that wall, but if it's at four feet, then bob's your uncle.

As I write, I am thinking that I should install the towel bars at four feet, just to further justify that height. The tile guy said the upper four with the mosaic might "look heavy" but I also have some art from the last version of this color scheme which will help some, I believe.

Beautiful rooms Pam and Sombreuil!!