Hello Im adding a sink in my bathroom remodel and want to make sure I get the drain piping correct. I plan to move the existing plumbing from the center to the left about a foot and a half, then add plumbing approximately 3 feet to the right of that. I was thinking I can just shorten the 1.5 inch ABS run thats existing, then split off the main drain (also 1.5") again below the existing sanitee and run over to the new plumbing/sink. Is that a good plan? Im also curious about adding stop valves just beyond the right sink drop ear to have the ability to shut off the tub at the end of the line. What do I need to do that, and have access inside the vanity for it? Thank you very much!

Need advice and or opinions. My daughter just put in a bid on home. Built in the late 70's. Location is Western New York , town of West Seneca. Place looks very good and is in good condition after being flipped by couple in the business. Even though she will have a home inspection done, I'm confident there is no major problems. In fact a previous bidder/buyer already had a home inspection done and although we cannot get a written report, we are told by a reliable source the only problem found was a small area of mold in the attic crawl space and couple of loose bricks in the wood burning fireplace. Both already noted and will be remedied. The previous bidder was on contingent and my daughter was able offer a bid without contingency. The first buyer was unable to remove contingency. So the place is hers, barring any unforeseen problems, legal or otherwise. There is one item of concern that I want to investigate however. The basement is below the level of the street sewer lines. In other words basement drain tiles are located at the ceiling of the basement and the basement sink and washing machine has a pump up drain to the sewer lines. Also the basement has a drain in the center of the floor. I have no idea if where it goes. I can't remember if the house has a sump pit or not (I'm guessing not). It's not so much that the drain lines are above the floor, (my son who also recently bought a home also has his drain lines about 3 feet above the basement floor) but that they are at the ceiling level of the basement. So my question or curiosity is what is is up with the drain in the floor and should she expect any possible major problems concerning the high level of drain lines or should I say the below level of basement in the future? Don't know if it matters or not, but the house is on a curve and might be on a very slight incline.