Hi Kenny:
Yep - lots of variables to contend with here. Therefore I speak only for what I know to be true(ish) here in Phoenix, AZ. Most experienced
permaculture consultants here charge $50 an hour. Note that this is for urban applications and rarely are these projects larger than a good sized market garden. Less experienced designers might start off at $35/hr and more expert designers have charged more. I personally don't know the rate for larger farm applications and don't know that any around here have been interested in
permaculture methods.