States draw the line differently — some by dollar value, some by the type of work or whether it needs building approval. Above the line, the work must be carried out or contracted by a licensed builder or registered practitioner:
NSWBuilding or trade work over $5,000 (labour + materials) needs a licensed contractor.
VICDomestic building work over $10,000 needs a registered building practitioner.
QLDBuilding work over $3,300 needs a QBCC-licensed contractor.
WABuilder work of $20,000 or more needs a registered building contractor.
SANo dollar floor — any domestic building work needs a licensed contractor.
TASSet by work category, not price — anything beyond minor low-risk work needs a licensed builder.
ACTNo dollar floor — any work that needs building approval needs a licensed practitioner.
NT“Prescribed” residential building work over $25,000 needs a registered builder.
Separate (and often lower) thresholds trigger a written contract and home-warranty / indemnity insurance — e.g. NSW HBC insurance over $20,000, VIC domestic building insurance over $16,000, SA contract + insurance over $20,000, ACT insurance from $12,000. Figures reviewed June 2026; confirm the current rule with your state regulator before work starts.