Building Work Contract Requirements in SA

What it is

In South Australia a residential building contract is called a domestic building work contract. The Building Work Contractors Act 1995 (SA) and the Building Work Contractors Regulations 2011 set the rules, and Consumer and Business Services (CBS) enforces them.

Part 5 of the Act does three separate jobs. Division 1 says what the contract must contain. Division 2 implies warranties into it whatever it says. Division 3 forces insurance in front of it before the builder starts.

The trigger for Division 1 is value, and that value moved on 10 November 2025.

The $20,000 trigger

Division 1 does not apply to minor domestic building work (s27(2)). Section 3(1) defines minor domestic building work as work at a cost to the building owner that is less than the sum prescribed by regulation. Regulation 4 prescribes $20,000.

So the rule is: at $20,000 or more the section 28 formalities bite. Below $20,000 nothing in Division 1 applies.

Watch the boundary. It is $20,000 or more, not over $20,000. A job priced at exactly $20,000 needs the full written contract. The old figure was $12,000, and it changed when the Building Work Contractors (Building Indemnity Insurance) Amendment Regulations 2025 commenced on 10 November 2025.

What section 28 demands

Section 28(1) sets seven requirements:

• the contract is in writing
• it sets out in full all the contractual terms
• it names the business the contractor trades under, the licence number and the names and licence numbers of any partners
• it complies with the Regulations on contents
• both the contractor and the owner sign it, personally or through an authorised agent
• the owner gets a copy of the signed contract as soon as reasonably practicable after both sign, together with the prescribed notice
• the copy and the notice are readily legible apart from signatures

The prescribed notice is Form 1, "Your building contract: your rights and obligations", set out in Schedule 3 of the Regulations. There is no day count on delivery. "As soon as reasonably practicable" is the test.

Warranties that survive the contract

Section 32(2) implies six warranties into every domestic building work contract with no value threshold at all, so they reach the $3,000 job as well as the $900,000 one. They cover proper workmanship to accepted trade standards and in accordance with the agreed plans, good and proper materials, compliance with statutory requirements, reasonable diligence where no completion period is stated, fitness for human habitation on a house and fitness for a purpose the owner made known.

Section 42 makes any purported exclusion, limitation, modification or waiver of them void. Not voidable. Void. Section 32(5) gives five years from completion to start proceedings, and s32(6) says that period may not be extended.

Insurance before the first dollar

Section 34 stops a contractor performing the work at all unless a complying building indemnity insurance policy is in force and the owner holds the insurance certificate. Division 3 catches domestic building work of $20,000 or more that needs development approval (s33(2) with reg 4).

Regulation 18(1)(b) fixes the minimum cover at $250,000 per dwelling for policies taken out on or after 10 November 2025, lifted from $80,000. SA.GOV.AU puts the practical rule plainly: work cannot start until the policy is taken out and both the owner and the council hold the certificate. Section 34 carries a maximum penalty of $100,000 for an individual and $500,000 for a body corporate.

What getting it wrong costs

Breaching s28(1) is an offence: $50,000 maximum for a natural person, $250,000 for a body corporate, with a $5,000 expiation fee.

The commercial hit is worse than the fine. Under s36(5)(b), if the builder has failed to comply with any requirement of Division 1 or Division 3, the owner's right to terminate does not close after five clear business days. It stays open until the work is complete. A missing Form 1 can hand the owner an exit on month nine of a twelve month build. Formality compliance is not paperwork in SA. It is the thing holding the contract together.