I vaguely remembered something about the number of permits being related to the property, as there was some discussion about this at the time the permit system was being implemented, but wasn't sure (I may potentially be in the same boat), but after Jnr's post followed his link to find this:
http://www.buildingcommission.com.au/re ... _FINAL.pdf
It states:
"May obtain building permits for a single dwelling and associated
work on a single property, in any three-year period."
Note the "permits" ie. multiple permits but only on a "single property".
So yes you are an OB and yes you can have 2 permits for the single property in three years.
Hope this helps.
Chris.