In this case they'd still have to go inside to go to the bathroom. :/

I've got a bathroom in my out-building office, too, and a small kitchen with a sink, coffee maker, toaster, fridge, and so on. The limit is money to spend and land area to build on :)

to be honest, having to walk inside to use the bathroom or refill your cup of coffee seems like a nice way to stand up and get the blood flowing again + breathe some fresh air.