Plastering licensing in NSW and Queensland
NSW. Dry plastering is a licensed home building trade in NSW. In NSW you need a contractor licence for residential building or trade work valued at more than $5,000 in labour and materials, including GST. Check the licence category for your work with Building Commission NSW before you quote.
Queensland. The QBCC has separate Plastering drywall and Plastering solid trade contractor licence classes. In Queensland the QBCC generally requires a licence for building work valued over $3,300. If you subcontract to a licensed builder you need a contractor licence of the right class for your work. If you subcontract to a licensed trade contractor you may not need your own contractor licence, though occupational licences still apply.
Licensing rules change and depend on the work. Always confirm with the regulator in your state.
Sources: Checking your contractor or tradesperson is qualified (NSW Government) · Available licences (QBCC) · When you need a licence (QBCC)