@Seek said:
To answer what I want from this, I would like to understand whether the residential block is built to the acoustic standard as per the relevant legislation.My preliminary testing suggests it potentially does not by a great deal.
Even though I’m sure you won’t like it, the fact is that on the basis of a private certification the habitable areas of the building complied with the relevant noise standards prior to Council issuing the Certificate of Occupancy, and that is (as I said before) IT.
If the current noise levels in your Unit exceed those standards now (i.e. after completion) that could be due to an incorrect certification, or increased traffic volumes, or changes to the types of vehicles using the roadway, or the design of nearby developments, or a myriad of other factors – none of which I believe you can do anything about now.
As I said before, if the windows of concern aren’t Common Property or if the Owners Corporation (O/C) doesn’t consider that insulating those is a maintenance issue, then you should to seek its consent to undertake those works yourself; at least you’ll get some sleep!