Building and trade rules in South Australia
The regulator is Consumer and Business Services (CBS).
Deposit limit
For domestic building contracts of $20,000 or more, the deposit should be no more than 5% of the total.
Source: SA.GOV.AU, checked 11 November 2026.
Contracts and licences
You must have a written contract if the domestic building work is worth $20,000 or more. Builders need a building work contractor's licence, which can be limited to specific types of work.
Source: SA.GOV.AU
Go to Consumer and Business Services (CBS) >
General information, not legal advice. Rules change, so check the regulator before you sign. See trade costs >