Building permit applied yesterday! My liason expected to get council approval at the end of next week.
About the sound batts, I decided not to go since the quote is around $1500 for between ground & 1st floor. I did not expected the price is soooo high, way above my budget ($800). Maybe I will discuss with my site supervisor after construction start to see if I could install some sound batts from bunnings by myself.
I will do some site cleaning before getting my building permit. Too many rain these days!