In my opinion …
It is essential first to obtain a structural engineers report to ascertain whether the wall to be removed is structural or non structural, and whether waterproofing will be impacted.
If there are no internal walls on the structural plan then the engineer should state this in the report.
The structural engineer’s report should be included with any application to the Owner’s Corporation for renovation work.
Check with your Council. A Council Development Application may still be required where you are changing the dimensions of any room. The Council Development Application requires approval by the Owners’ Corporation.
An internal wall, although it is not located on common property will still impact common property as it touches the common property ceiling slab and the common property floor slab.
The removal of an internal wall will be either a Minor Renovation or a Major Renovation, depending on the circumstances.
If total removal of a non structural wall is desired then the project would probably be classified as a ‘reconfiguration’ and therefore be a Minor Renovation.
If total removal of a non structural wall is desired AND it impacts on any waterproofing then this shifts the project into being a Major Renovation.
If total removal of a structural wall is desired then it would be a Major Renovation.
Minor Renovations require a different type of approval process than Major Renovations.