Looking at a property that has a 30x50 metal building with a mezzanine on the short gabled side. I would like potentially build an office and bathroom upstairs but would need to add plumbing. Anyone gone in after the fact and can share some photos of how they accomplished this? Would be running to a septic but that is another thread.
Not sure what you want. As the office / bath is upstairs, you've just got to get water in and water out. I did it before the fact by putting conduit and a 3" drain line in all the corners. For water, I just run 3/4" PEX through the electrical sleeve. But you can do it after the fact by adding a water main and drain on the side of the building through the steel. You'll need a "vent solution" for any drain, but that's easy.
Standard P-traps and slope designs apply, but you've got an upper floor, so should be easy.
My only hesitation would be "cold climate" where an exterior water line will likely freeze. You're in DFW, it'll happen, but not very frequently and if you use PEX, nothing is going to blow up.
I don't know DFW septic regulations, but down here in central Texas the one thing I cannot do is tap an existing septic and add beds/baths without a full engineering deal and redesign. And if I do it "anyway" it's all good until resale, where they WILL catch it.
