dgk wrote:

I'm thinking about a bathroom renovation. The house is an attached
house, 18 feet wide. The toilet is on the second floor above the
kitchen.

My proposed renovation would really work out better if I could move
the toilet maybe a foot or so. I am planning on hiring someone
competent for this rather than attempting it myself, but I was
wondering if this is a really big job. I searched and found a few
posts mentioning moving a toilet two inches or so but a foot would
appear to be at the outer limit.

Do the headers imply that you are within the 5 boroughs of NY?
If so, I assume an inspection and permit will be made.
In general, the toilet can be up to 3 feet from the stack,
but NYC may have their own restrictions.

It can be a big job, especially since the pipe is likely cast iron
out there. Make some sketches of what you'd like to do and
get a few estimates.

Jim