Do you need a licence for carpentry or deck-building work?

Carpentry does not work quite the same way as a trade like plumbing or electrical, where a licence is required for almost any job regardless of size. Instead, most Australian states regulate carpentry and general building work through a dollar-value threshold — below a certain combined value of labour and materials, an unlicensed but competent tradesperson can generally do the work, while above it, a licensed contractor is required. Knowing roughly where that line sits, and that it moves between states, is worth understanding before you assume any handyman can legally take on a bigger job.

New South Wales is a useful starting point because its rules are well documented: under the Home Building Act 1989, a contractor licence issued by NSW Fair Trading, under Building Commission NSW, is generally required for residential building work where the combined value of labour and materials exceeds $5,000. Carrying out unlicensed work above that threshold is illegal in NSW, and penalties commonly cited for breaching this can run up to around $22,000 for an individual and $110,000 for a company, so it is not a minor technicality.

Other states apply their own thresholds and their own regulators, and while exact figures are commonly cited in industry guides, they do change over time, so treat the following as general orientation rather than a current legal reference. Queensland's threshold, enforced through the Queensland Building and Construction Commission (QBCC), is commonly cited at around $3,300. Victoria applies a threshold commonly cited at around $5,000 for domestic building work, regulated by the Victorian Building Authority operating as the Building and Plumbing Commission. Western Australia's threshold is commonly cited noticeably higher, around $20,000. Because these figures move and vary by exactly what counts as "building work" in each state's legislation, the most reliable way to confirm the current threshold for your job is to check directly with your state's building regulator before assuming a job is small enough to go unlicensed.

Dollar value is not the only trigger, either. Certain categories of work commonly require a licensed builder or specific trade licence regardless of the price tag, particularly anything affecting structural or load-bearing elements of a building. This matters for decking specifically: an elevated deck, one attached to the structure of the house, or one requiring engineering sign-off for footings or a ledger connection can fall into licensed or regulated territory even at a value that would otherwise sit under the general threshold — our separate article on deck-building costs touches on when a deck's height or design commonly triggers these extra requirements.

The consequences of unlicensed work above the relevant threshold are similar across states: fines for the person doing the work, the possibility of a rectification order requiring the job to be redone properly, and real practical downsides for the homeowner, including voided home insurance and complications if unlicensed work is discovered during a pre-sale building inspection. A legitimate licensed contractor will generally provide a licence number without hesitation, and most state regulators maintain a public register where that licence can be checked against the person's name and the class of work.

This article is general information about how carpentry and building licensing commonly works across Australia, not legal advice for your specific job, and thresholds and rules change over time and vary by state. Confirming directly with your state's building regulator is worthwhile for anything beyond a small, straightforward job. Our directory lists licensed Australian carpenters and builders by area if you are ready to start comparing.

Frequently asked questions