Under NSW law, some post-construction clean-up activities involving crystalline silica dust fall under the rules for processing crystalline silica substances. Since Chapter 8A of the Work Health and Safety Regulation 2017 took effect on 1 September 2024, these activities must be controlled, and the risk must be assessed to determine whether the work is high risk. That means the final clean can involve specific silica safety obligations, not just routine housekeeping.
Here is why it matters. Materials such as concrete, tiles and render can contain crystalline silica, and some fibre-cement products contain it too. Cutting, drilling and grinding these materials can leave fine dust across a site, even after construction work has stopped. Dry sweeping or using unsuitable vacuum equipment can disturb settled dust and put it back into the air. SafeWork NSW recommends appropriate methods, such as wet cleaning or suitable M- or H-class industrial vacuum equipment, to help control exposure.
This matters to principal contractors, developers and site managers preparing for handover. Where silica processing requirements apply, the work may require a written risk assessment, suitable control measures and, if the processing is high risk, a silica risk control plan or an applicable Safe Work Method Statement for construction work. This article explains how Chapter 8A applies to post-construction cleaning, how to determine whether the work is high risk, and what to ask a cleaning contractor to help ensure silica dust is managed safely before handover.
Why do the new silica rules apply to construction cleaning?
The new silica rules apply to construction cleaning because clean-up is now counted as silica processing. Under Chapter 8A, “processing” is not just cutting or grinding. It includes clearing the dust afterward. So sweeping or vacuuming silica dust carries the same legal duties as the cutting that created it.
Most people assume silica risk ends when the cutting stops but it doesn’t. The dust is still there, sitting on floors, ledges, and surfaces across the whole site. It only becomes a risk again when something disturbs it, and cleaning is what disturbs it.
That is where the cleaning method matters. Dry sweeping can lift settled dust back into the air, while household vacuum cleaners are not designed to safely capture hazardous silica dust. Suitable M- or H-class industrial vacuum equipment and wet cleaning methods can help control exposure. The cleaning method should match the dust hazard and the site’s risk controls.
This matters during handover, when construction work may be complete but residual dust still needs to be removed. Where Chapter 8A applies, the relevant processing must be risk-assessed and controlled. If the assessment identifies high-risk processing, additional requirements apply, including a written silica risk control plan or, for high-risk construction work, an applicable Safe Work Method Statement. The task may look like routine housekeeping, but the silica risk and the required controls must be assessed before the clean begins.
What are the new crystalline silica regulations in NSW?
The main rule is Chapter 8A of the Work Health and Safety Regulation, which started on 1 September 2024. It sets fixed duties for any work with crystalline silica, and it applies to any material that is at least 1% crystalline silica, not just engineered stone.
What Chapter 8A Requires
Chapter 8A sets fixed duties for every business doing silica work. At a minimum, it requires:
- A risk assessment for the work being done
- Proper dust controls while the work happens
- Documentation that proves both were in place
- Compliance from any business handling material that is at least 1% crystalline silica
How It Changed Things
Before Chapter 8A, silica sat under general safety duties. Businesses had to do what was “reasonably practicable,” which was open to interpretation. Chapter 8A removed the guesswork. It names the materials, sets the exposure limit, lists the paperwork required, and attaches penalties when any of it is missing.
The Two Rules That Build on It
Two further rules sit on top of Chapter 8A:
- The Silica Worker Register, from 1 October 2025, requires businesses to register workers who do high-risk silica work.
- The Safe Work Australia Model Code of Practice, published November 2025, sets out the approved way to do the work and can be used in court to judge whether a business did enough.
Every Business Carries Its Own Duty
This is the point that matters most. Every business on a site carries these duties on its own. A head contractor being compliant does not cover a subcontractor, and a signed contract does not pass the risk to someone else. Each business manages and checks its own compliance. Company directors carry a personal duty too, under section 27 of the WHS Act.
Is post-construction dust clean-up high-risk silica processing?
Post-construction dust clean-up can become high-risk silica processing. Under Chapter 8A, certain clean-up activities involving crystalline silica dust, including sweeping, fall within the definition of processing. The business must assess the risk and document whether the processing is high risk before the work begins.
What makes silica work “high-risk”
Silical processing is high risk when it is reasonably likely to create a risk to someone’s health at the workplace. The assessment must consider several factors:
- The type of processing being carried out
- The form and concentration of crystalline silica in the material
- How frequently and for how long workers may be exposed
- Whether airborne respirable crystalline silica is reasonably likely to exceed half the workplace exposure standard, which is 0.025 mg/m³
- Relevant air monitoring results, health monitoring results and previous exposure incidents
Dry sweeping can reintroduce settled silica dust into the air, while unsuitable vacuum equipment may fail to contain it. These methods raise serious exposure concerns. The risk assessment must still consider the specific task and applicable controls rather than assume that every clean-up task has the same risk level.
The mistake that catches people out
One important rule is that personal protective equipment cannot be used to determine whether processing is high risk.
If a risk assessment classifies a task as low risk because workers will wear P2 masks, the assessment is incorrect. Respiratory protective equipment does not control the hazard at its source, so it cannot be counted when making this determination. The assessment must consider the processing itself and the permitted isolation and engineering controls, not rely on masks or administrative measures to lower the risk classification.
Why getting this wrong matters
If processing is incorrectly classified as low risk, the business may fail to meet additional requirements that apply to high-risk work. These can include preparing a silica risk control plan, providing specific worker training, registering relevant workers and arranging air or health monitoring where required.
The risk assessment must be recorded in writing, including how the relevant factors were considered and the decision reached. Correctly classifying the work before the clean begins helps ensure the required controls and documentation are in place, rather than discovering a gap during a site inspection or handover.
What controls and compliance does silica-safe cleaning require?
Silica-safe cleaning requires effective dust controls and documentation showing how the risks were assessed and managed. Depending on the work, this can include a risk assessment, a Silica Risk Control Plan or an applicable Safe Work Method Statement, worker training and registration. The requirements depend on the type of processing and whether it is classified as high risk.
The right dust controls
The goal is to prevent silica dust from becoming airborne, rather than dealing with it after it has spread. Depending on the task, suitable controls can include wet cleaning methods to limit airborne dust, appropriate industrial vacuum equipment, such as M-class or H-class units, and isolation or containment to limit the spread of dust.
Dry sweeping, compressed-air cleaning and unsuitable vacuum equipment can disturb settled silica dust or release it back into the air. The cleaning method and equipment must be suitable for the dust hazard and the work being performed.
The right paperwork and training
For high-risk crystalline silica processing, additional requirements apply. These can include:
- A Silica Risk Control Plan or applicable SWMS, prepared before the work begins and setting out the hazards, controls and how they will be implemented. An applicable SWMS may be used instead of a Silica Risk Control Plan for high-risk processing that is construction work.
- Trained workers, who have completed the required approved training. Recognised courses include 10830NAT, CPCSIL3001 and CPCSIL4001. Training records must be kept for the required period, including five years after workers stop doing high-risk processing for the business.
- Worker registration, where required. PCBUs must notify SafeWork NSW about workers undertaking high-risk crystalline silica processing no later than 28 days after they start that work.
Certain construction clean-up activities involving crystalline silica dust can count as processing, so they should not automatically be treated as routine housekeeping. The business must assess the actual work to determine which controls and compliance duties apply.
What Should You Ask a Cleaning Contractor Before Hiring Them?
Ask the contractor to prove they treat silica clean-up as controlled work, not routine cleaning. The key questions cover four things: what dust controls they use, whether they have a Silica Risk Control Plan, whether their workers are trained, and whether those workers are registered. A contractor who cannot answer these clearly is a risk you take on, because the compliance gap attaches to your site, not just to them.
Ask what dust controls they use
Ask them exactly how they keep silica dust out of the air. A compliant answer involves wet suppression, H-Class HEPA extraction, or containment of the work area. If the answer is a standard vacuum and a broom, that is not silica-safe cleaning, whatever else is promised.
Ask to see their documentation
Paperwork is what proves the work was done properly, so ask the contractor to produce it. Specifically, ask for:
- Their Silica Risk Control Plan for your site
- Proof their workers have completed approved silica training
- Confirmation their workers are on the NSW Silica Worker Register
A contractor who can show these quickly is one who does this properly. One who hesitates, or offers a general assurance instead of an actual document, is showing you where the gap is.
Ask whether the plan fits your site
A plan written for one site does not automatically fit another. Ask whether they assess your specific site, the materials, the amount of dust, the layout, and adapt the controls to it, rather than applying the same generic approach everywhere.
Why these questions matter to you
This is the part worth being clear about. Under the law, each business on a site carries its own silica duty, and that duty cannot be signed away in a contract. If a cleaning contractor cuts corners on your site, the exposure does not stay with them alone. As the principal contractor, developer, or site owner, you can face enforcement for a clean-up that was handled wrong, even if someone else held the broom. Asking these questions up front is how you keep that risk off your site.
What changes on 1 December 2026, and what does it mean for your sites?
From 1 December 2026, the silica exposure standard becomes an exposure limit [Source: SafeWork NSW]. The number may stay the same at first, currently 0.05 mg/m³ over an eight-hour day, but the way it works under the law changes. A standard is a benchmark to work toward. A limit is a hard ceiling you are not allowed to cross.
The difference between a standard and a limit
Right now, the figure works as a benchmark. It is one factor a business weighs up as part of a wider risk assessment.
From December 2026, it becomes a line that must not be crossed, full stop. In practice, this means regulators expect businesses to treat 0.05 mg/m³ as a firm ceiling, not a number they can sit just under and still call themselves compliant.
The number may drop too
There is a second change on the horizon. Some bodies are pushing for the limit to be lowered to 0.02 mg/m³.
If that happens, it tightens everything. A dust control method that keeps exposure under 0.05 mg/m³ today might not pass a 0.02 mg/m³ limit without real upgrades to extraction, ventilation, or work method.
What this means for your sites
The takeaway is simple: do not build your approach around just scraping under today’s number. A clean that barely meets 0.05 mg/m³ now is exactly the kind that fails when the figure becomes a hard limit, or drops lower.
The safer position is controls with room to spare. A contractor whose methods sit well under the current figure is one who will still be compliant after December 2026, rather than one scrambling to catch up. This is worth factoring into who you hire now, not after the change takes effect.
What are the risks of using a non-compliant cleaner?
Using a cleaning contractor that fails to control silica dust can create health and safety risks, compliance issues and delays to your project. Depending on each business’s role and responsibilities, more than one party may have legal duties relating to the work. Hiring a contractor does not automatically remove your own obligations as a principal contractor, developer or business managing the site.
Some of the risks of using a non-compliant cleners are:
1. The consequences can affect more than one business
SafeWork NSW inspectors can examine site conditions, work practices and relevant documentation when investigating potential breaches. If workers are clearing silica dust without adequate controls, having a contract that specifies the right procedures does not, by itself, demonstrate that the work was carried out safely.
Where multiple businesses have duties relating to the same work, each must meet its own obligations to the extent required by law. Depending on the circumstances, an inspector may issue an improvement notice, direct an activity to stop through a prohibition notice, or issue a penalty notice for an applicable offence.
2. Directors can also face personal consequences
The responsibility may extend beyond the company. Under section 27 of the NSW Work Health and Safety Act 2011, officers must exercise due diligence to ensure their business meets its WHS duties. An officer who fails to meet this personal duty may face liability under the Act. However, a company breach does not automatically make every director personally liable.
3. A non-compliant clean can delay handover
There can also be practical consequences for the project schedule. If unsafe work must stop, an inspector requires corrective action, or silica dust has not been adequately controlled, the cleaning work may need to be reviewed or repeated before the project can progress.
Missing or incomplete records can also make it harder to demonstrate that required assessments and controls were in place. While the impact depends on the circumstances, identifying gaps before the final clean is complete can help avoid preventable rework and last-minute handover problems.
Knowing what a compliant clean requires is one thing. Having a crew that actually delivers it, with the controls, the plan, and the trained workers in place, is what keeps the risk off your site.
Silica-Aware Post-Construction Cleaning Across Greater Sydney
Post-construction clean-up can involve silica-related risks that require more than routine housekeeping. Where silica processing rules apply, the work needs an appropriate risk assessment, effective dust controls and the documentation, training and worker registration required for the specific tasks.
Cleanin provides post-construction cleaning across Greater Sydney, with cleaning methods and dust controls planned around the site and the work involved. Depending on the materials and tasks, controls may include suitable industrial vacuum extraction, wet cleaning methods and measures to prevent dust spreading to other areas. The applicable risk assessment and safety documentation should reflect the actual work being carried out.
For principal contractors, developers and site managers, planning the final clean early helps identify potential silica risks before handover and reduces the chance of avoidable rework. Request an on-site builders clean and construction cleaning service quote for your project.
