Beyond NSW, VIC and QLD, the other five jurisdictions each run their own builder-licensing regime — and the differences (thresholds, net-asset rules, and one mutual-recognition trap) catch tradies who cross borders. Here is the roundup.
Western Australia — Building Services Board
The Building Services Board (Building Services (Registration) Act 2011) requires registration to contract for building work that needs a permit and is valued $20,000 or more. WA splits "building practitioner" (the individual with the technical competence to supervise) from "building contractor" (the entity that contracts and advertises, which must nominate at least one registered practitioner and show financial capacity). The core qualification is the CPC50220 Diploma of Building and Construction, via either Diploma plus ~7 years' experience, or RPL plus board exams and ~5 years' supervisory experience (only supervisory/management time counts, not pure on-tools). Electrical and plumbing have separate boards.
South Australia — Consumer and Business Services
CBS (Building Work Contractors Act 1995) requires a licence to contract building work for others — general building, residential, commercial and trade work (carpentry, plastering, tiling, painting, concreting, bricklaying) where you contract directly with the public, or hold yourself out as a builder. You need a licence for work over ~$20,000 (labour + materials), to supervise or sign off, or to advertise. Expect a Cert IV or Diploma (or strong RPL), 3–6 years' experience by class, a nominated registered building work supervisor, a police certificate, financial solvency and around $10,000 net assets. Plumbing, gas and electrical sit under a separate Act.
Tasmania — CBOS (and the AMR trap)
CBOS (Building Act 2016) licenses builders by height and complexity — Domestic / Low Rise / Medium Rise / Open. You need the minimum qualification plus supervised experience (with a trade qual, ~2 years rising to ~3 for Open; without one, ~4 rising to ~6). The trap: Automatic Mutual Recognition (AMR) does not yet cover builders in Tasmania — an interstate builder cannot simply rely on AMR to work in TAS and must apply through the CBOS pathway (standard mutual recognition may still apply). See Mutual Recognition Across States.
ACT — Access Canberra
The ACT regulator (via Access Canberra) licenses builders by class (broadly Class A/B/C, aligned with the NCC building classes), splitting individuals (technical competence and supervision) from companies (which nominate a licensed individual as responsible supervisor). Expect a Cert IV/Diploma for mid-level classes and more for unrestricted, several years' experience by class, insurance (residential/home warranty and public liability), and fit-and-proper and police checks. The precise current ACT fees and class names move — confirm directly with Access Canberra.
Northern Territory — Building Practitioners Board
The Building Practitioners Board (Building Act) requires a licence for construction work valued $12,000 or more on specified building classes, with Residential (Restricted), Commercial (Restricted) and Commercial (Unrestricted) categories. The NT is notably strict on finances and references: an individual needs a Cert IV in Building and Construction, at least 3 years' post-qualification experience (with at least 1 year in the NT), at least 3 written references from registered practitioners, fit-and-proper, and a Net Assets Certificate showing ≥$50,000 net tangible assets from an accountant. Indicative fees (2025–26): application $333, plus a licence term of 2 years $1,000, 3 years $1,500 or 4 years $2,001.
The cross-border picture
Two themes to hold: thresholds vary (WA/SA $20k, NT $12k), and the net-asset and reference bars are heaviest in the NT ($50k NTA, three references). If you work across state lines, read Mutual Recognition Across States first — and remember the TAS builder AMR carve-out.
Common mistakes
- Assuming your home-state licence works everywhere — check mutual recognition, and the TAS builder carve-out.
- Underestimating the NT's $50k net-tangible-assets and three-reference bar.
- Counting on-tools time as supervisory experience in WA (only supervisory/management counts).
- Contracting over the state threshold ($20k WA/SA, $12k NT) unlicensed.
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