9x9 will be way to small. Think about all the stuff that you need to
brew. Then think about all the stuff that needs to be out while
brewing. You'll need plenty of room when brewing your beer. I brew
mostly extract and use a turkey deep fryer. That means I need enough
room for the fryer, tank and extra room to mover around without
worrying about bumping into anything hot.

If you brew extract you won't need as much room compared to all-grain.
There is more equipment so you need more room. Not to mention that
you'll be brewing longer so you'll want to be comfortable.

Equipment:
Sink, table, floor drain, some type of kegerator (chest freezer or
fridge), and your basic brewing equipment.

Setup:
I set my kettle over the floor drain just in case I have a boil
over. A table is used for your carboys and as a work space for prepping
the ingredients. You can use the space below for buckets, kegs, burner
and propane tank. I few shelves and maybe a bar hanging from the
ceiling to store other brewing equipment is nice and gets the stuff out
of the way. The chest freezer or upright fridge is for lagering and
beer storage.

Another bonus item is a radio and/or TV. Need some entertainment
between steps.

As you can see, with all this stuff a 9x9 room just won't cut it.
You'll run the risk of tripping over the line from your propane tank or
bumping into your brew kettle not to mention that it will be
uncomfortable to be in there. Plus it helps to have room for helpers.
Not sure about blue prints.
Good Luck