Builder marketing rules in South Australia: ACL, BWC Act and Consumer and Business Services

Key takeaways

• SA residential builder marketing sits under the ACL plus the Building Work Contractors Act 1995 (SA) and is enforced by Consumer and Business Services (CBS).
• CBS licence number must appear on any advertising for residential building work under the BWC Act.
• Building indemnity insurance detail cannot be misrepresented in advertising. From 10 November 2025 the trigger sits at $20,000 with a $250,000 limit.
• A registered building work supervisor must be nominated on every contract and the supervisor status is publicly checkable; advertising a non-nominated supervisor is misleading.
• Fake or undisclosed incentivised reviews breach ACL sections 18 and 29 and attract civil penalties.

The regulator

Consumer and Business Services is the single point of regulation for residential building marketing in South Australia. CBS administers the Building Work Contractors Act 1995, licenses building work contractors and registered supervisors, and enforces the ACL for building services alongside the ACCC.

Licence and supervisor display

Under the BWC Act, a licensed building work contractor must include their licence number in advertising for residential building work. The registered supervisor named on the contract must be a real, current registrant. CBS publishes a searchable public register.

Common marketing traps CBS has enforced against:

• Advertising by an unlicensed corporate entity that lists a licensed supervisor working elsewhere.
• Website content that displays a supervisor no longer employed by the business.
• Trade advertising that describes work outside the licence class held.

Building indemnity insurance in advertising

South Australia requires building indemnity insurance for domestic building work over $20,000 from 10 November 2025 (previously $12,000). The cover limit is $250,000. Advertising cannot misdescribe when insurance applies, its trigger events or its limit. Consumer Protection SA has treated inaccurate insurance claims as ACL section 18 breaches.

Quote and estimate conduct

CBS applies the general ACL price-representation test to advertised quotes. Provisional sum and prime cost items in domestic building contracts have their own disclosure rules under the BWC Act and misrepresenting them in advertising is a compliance breach.

What SA builders should audit today

• CBS licence number visible on every advertising channel.
• Supervisor named in advertising matches the current CBS-registered supervisor on the contract.
• Building indemnity insurance claims match the current $20,000 trigger and $250,000 limit.
• Provisional sum items are described consistently in advertising and quotes.
• Every review is verifiable to a real customer.