Owner-Builders & Regulations
What building work can I do myself, and when must I use a licensed trade?
Whether you can do a task yourself depends on the work, its value, the approvals and local licensing rules. An owner-builder authority does not replace a required trade licence. Check electrical, plumbing, gas, drainage, refrigeration, asbestos and other regulated work with the relevant authority. If you have engaged a builder, agree any work you will do yourself in writing, including access, safety, cost and responsibility for defects.
Official sources:
General information only. Requirements vary by state or territory and change over time, so check the current rules for your location.