I built a 2500 sqft metal building and framed an 1000 sq ft living area in it leaving me a 1500 sqft shop. Now I want to finish out the remaining 1500 ft into living space. Unfortunately I did not preplumb it for this addition and now I need to add 2 bathrooms. I have an aerobic system that runs the 1000 sqft living area now and I want to tap into that. I was wondering if I could run the plumbing out of the backside of the remaining 1500 sq ft shop and around the corner to tap into the existing aerobic system.
The deciding factor is whether or not your system is sized to handle the additional load from 2 more bathrooms. As long as you can get the proper slope on the drain pipe, connecting to the existing pipe before it enters your tank is fairly simple.