The next stage of the process is to apply for a building permit. Details of how to do this are included here.
You can apply for a Building Permit through Council or use a Private Building Surveyor. If you choose to use a Private Building Surveyor, they are responsible for your Building Permits (including assessment of your application, issuing the Building Permit, carrying out all inspections and issuing your Occupancy Permit).
It is important to note that a building permit can not be issued until a planning permit is issued, plans are endorsed and any conditions requiring compliance before development starts have been met.