You know what you’re in for. Now, what are you up for? The average cost to establish a Mad Mex franchise is between approximately $400,000 to $600,000 +GST. This includes our franchise fee ($50,000 +GST), training ($20,000 – $25,000 +GST), shop fit out, equipment, opening stock and so on. The final cost depends on a range of variables including size and location of the restaurant.