Under our existing kitchen sink, the rough in drain line exits beneath the right hand sink tub which allows an open area beneath the left hand sink tub for our disposer unit. This seems to work great. That drain line exits (into the wall) approx 18 inches above the floor level.
We live in a County with no building codes. We're extending our kitchen wall which required the extension of the water lines and the drain line.
Question: Is the [above] location of the existing drain line located in the best possible location?