Thanks to my wife's idea, I am faced with moving our existing toilet three feet to the side of its present location.:( New walls have been studded in, and the floor raised 2 3/8". How far from the wall should the closet flange be set ? Also, this is a 125 year old farm house, I can not tie into the sewer drain pipe and was running new (pvc). How much fall is required? I will be tieing into the sewer drain outside of the house, my problem is trenching under a room addition, there is only about 8" of work space and very hard, rocky ground underneath. Can anybody offer some advice?

How far from the wall should the closet flange be set ?
The closet stub-up should be 12" out to the center of the stub-up.

How much fall is required?
1/4" to the foot is normal, however, If space's tight you my drop to 1/8th per foot.

I will be tieing into the sewer drain outside of the house, my problem is trenching under a room addition, there is only about 8" of work space and very hard, rocky ground underneath. Can anybody offer some advice? Unless your run will be longer then 32 feet ( at 1/4" to the foot) you should have no problem with the 8' restriction. Good luck, Tom