The removal guys recommended a consulting group that organised everything for us to put through council. I knew exactly the layout I wanted already, so that made it incredibly easy for the draftsman to alter his plans. He designed and engineered an extended deck as well. We had a soil and sight evaluation done so that the stumps could be engineered to the right specifications. Also because we are classified as a cyclone area we had to upgrade our tie downs and braces - which the removalists have to install in the house. (this cost us close to $3000 to upgrade).
The waste water system was determined on the number of bedrooms and the soil type. We are rural so we needed to install a septic system which includes a 3000L tank and 2 seepage trenches 14meters long by 2.5meters wide & 400mm deep.. I havent coordinated costs yet, because it is still at the paperwork stage. The consulting company also did an energy efficiency rating (20 pages long!!)
Needless to say, after printing all the plans and paperwork and council forms I had a book's worth of paper to submit to council!