Hi Wesley; Welcome to Permies!
I don't know of any "permies " type names.
BUT... (Showing my age here) I've always know them as outhouses!
Of course yours is indoors. How about an inhouse ?
I know "Necessary" room is probably more Permie sounding.
But hey, don't make fun of an elder :) You'll be one someday as well :)
Seriously, I think visitors will still think of it as the bath room, no matter what you call it. Its sort of instilled in us as american youngsters.
Even when its just a toilet and sink a (1/2 bath) and no bath tub... we still call it the bathroom.
And you really can't call it a water closet (WC, as they say in merry old England) because you're not using water to send the waste down a pipe to never be seen again.
Composting closet? CC? That doesn't work, does it.
"The rule of no realm is mine. But all worthy things that are in peril as the world now stands, these are my care. And for my part, I shall not wholly fail in my task if anything that passes through this night can still grow fairer or bear fruit and flower again in days to come. For I too am a steward. Did you not know?" Gandolf
I also have an in-house composting toilet (upstairs), and a room for bathing, with a shower, bathtub and sink (downstairs). Personally I call the toilet room the "toilet," and the bathing room the "bathroom." These are the terminology Ladakhis used for the first 20+ years I lived here.
One of my Indian housemates recently started calling the toilet the "loo," which works perfectly, but only if people know the word.
Now there's a new habit in India of calling the toilet the "washroom" much as Americans say "bathroom," and I find it confusing (and I prefer that nobody washes in my dry composting toilet).
Anecdotes about Americans saying "bathroom" when they mean "toilet" abound. When my brother-in-law first visited Ladakh, a student showed him around our school. Then the American asked for the bathroom. The student took him to one of the tiled rooms with a little drain in the corner, and stood there watching from the doorway. I suppose the student thought he might want to wash his hands or face after arriving by plane in the early morning. My brother-in-law was confused: "She told me about the composting toilets here being the proverbial hole in the floor, but that's tiny and too far into the corner!"
My own anecdote is from Russia in the 80s, when the water in Leningrad (St Petersburg) was notorious. I was out walking around the city, far from my hotel, when I got hit by urgency. I went running around but couldn't find a public toilet. I looked in my phrasebook for "bathroom" and found "ванная", pronounced vannaya, which I proceeded to say and point to in the book. Someone in the helpful crowd gathering around me mimed lathering up in the shower with quizzical look. In frustration i ran off and ended up under some shrubbery in a park. Ugh! What a horrible tourist!
Works at a residential alternative high school in the Himalayas SECMOL.org . "Back home" is Cape Cod, E Coast USA.
At first glance, that may not seem to fit if there is a man about the home. But I have to admit, although I am a guy, as I age, I find myself squatting more and more even if it is just #1 that I must go.
Oh the confessions that come up on Permies Forums sometimes!
gardener & author
Location: Ladakh, Indian Himalayas at 10,500 feet, zone 5
A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
-Robert A. Heinlein