WHS Obligations for Residential Builders in South Australia

What it is

South Australia runs the model work health and safety laws. The Work Health and Safety Act 2012 (SA) and the Work Health and Safety Regulations 2012 (SA) set the duties. SafeWork SA is the regulator.

The architecture is familiar: a primary duty on the PCBU, a due diligence duty on officers, a principal contractor layer for construction projects and a SWMS requirement for high risk construction work. Two numbers are specific to SA. The principal contractor threshold is $450,000, not the $250,000 used in most model states. And from 1 July 2026 the fall height that makes work high risk dropped from three metres to two.

The PCBU duty and officer due diligence

A PCBU must ensure, so far as is reasonably practicable, the health and safety of workers and of anyone else put at risk by the work. A builder is a PCBU. So is every subcontractor on site. The duties sit on top of each other rather than passing down the chain, and no contract shifts them.

Officers carry a personal duty. A director, or anyone who participates in decisions affecting a substantial part of the business, must exercise due diligence to ensure the PCBU complies. That means current WHS knowledge, the right resources and processes, and verification that they are used.

When you become the principal contractor

In South Australia a construction project is any project involving construction work valued at $450,000 or more, and every construction project must have a principal contractor.

By default the PCBU that commissions the work is the principal contractor. It can appoint another PCBU instead by authorising them to have management or control of the workplace. Where a homeowner engages a builder to run a construction project on their premises, the builder becomes principal contractor if the builder has management or control of the workplace. On a residential build that is the normal position.

The WHS management plan and site signage

The principal contractor must prepare a written WHS management plan before work commences, and SafeWork SA publishes a template. The plan must set out who holds WHS responsibilities, the consultation and coordination arrangements between the PCBUs on site, site-specific safety rules and how SWMS will be collected, assessed, monitored and reviewed.

Principal contractors carry extra duties:

• Install signage showing the principal contractor's name, 24-hour contact phone numbers and the location of the site office, clearly visible from outside the workplace.
• Take all reasonable steps to obtain the SWMS for any high risk construction work before that work commences.
• Manage the risks of construction materials and waste, plant not in use, essential services and nearby traffic.

SWMS and the two metre fall threshold

A SWMS is required for every category of high risk construction work in Chapter 6 of the WHS Regulations 2012 (SA): asbestos disturbance, confined spaces, energised electrical work, demolition of a load-bearing element, structural alterations needing temporary support, trenches deeper than 1.5 metres, precast and tilt-up concrete and work near a live traffic corridor, among others.

The change every SA builder needs to know is the fall height. From 1 July 2026, construction work involving a risk of a person falling more than two metres is high risk construction work in South Australia, down from three metres. SafeWork SA lowered it to align with the model WHS Regulations. It applies to all construction work including residential. The evidence was residential: two thirds of SA falls sat in the two to three metre band now captured, and most were on residential sites.

Penalties

South Australia introduced industrial manslaughter on 1 July 2024. Under section 30A of the WHS Act 2012 (SA), a PCBU or officer whose reckless or grossly negligent conduct breaches a health and safety duty and causes a worker's death faces up to 20 years imprisonment. A body corporate faces a fine of up to 18 million dollars. Below that, the standard tiers apply.

Duty holder	Category 1	Category 2	Category 3
Body corporate	$3,000,000	$1,500,000	$500,000
PCBU or officer	$600,000 or 5 years	$300,000	$100,000
Individual worker	$300,000 or 5 years	$150,000	$50,000

What to do about it

Price the job, then check the number. At $450,000 or more you are running a construction project and you need a written WHS management plan and site signage before anyone starts. Below it, the PCBU duty, the officer duty and the SWMS obligation all still apply.

Then reset your fall controls. Every SWMS template built around a three metre trigger is out of date. Reissue at two metres, retrain supervisors and reassess the tasks that just moved into the high risk category. On a single-storey build that is most of the roof work.