Bob wrote:
I would like to add a room to the side of my house for a small wood shop.
The best I can do with my property is a shop no more than nine feet wide.
Length can be as much as twenty feet. I would need a table saw, of course,
as well as a work bench and some of the essential, smaller power tools
(router table?, band saw?, etc.) Do I have enough space?

It depends on what sort of projects you're going to be doing and how
much stuff you plan to cram in there. It's probably more of how
efficiently you set up the shop and how well you use the space, rather
than simply the square footage.

Rule #1: go vertical early. Start thinking of utilizing the wall
space for cabinets and hanging items from the ceiling rather than just
planning the floor layout.

R