Since all of the pipes are buried what works at one house may not work at an identical house due to the piping being installed differently. I have out house plans, and the one thing they do not show is the routing of the plumbing.
My humble suggestion, look into bi-fold door or accordion doors to provide some privacy, and if necessary simple wall extensions. Anything involving moving to tapping into the existing plumbing is going be expensive and then matching the existing flooring may be difficult or impossible.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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