Construction sites generate crystalline silica dust whenever concrete is cut, tiles are drilled, or a slab is ground back. That dust, once airborne, is small enough to lodge permanently in lung tissue and cause silicosis, a disease with no cure. According to SafeWork NSW, since 2017, 516 workers in NSW have been diagnosed with it, and 36 have died.
From 1 September 2024, NSW closed the gap in how this risk gets managed. Chapter 8A of the Work Health and Safety Regulation extended controlled processing requirements to any material containing at least 1% crystalline silica, not just engineered stone. That change reaches further than most businesses expect. Clean-up counts. Site handover counts. Sweeping a floor after a demolition counts.
This article sets out what changed, who it applies to, and where compliance most often breaks down on NSW construction sites.
What Are the New Crystalline Silica Regulations in NSW Construction?
Chapter 8A of the Work Health and Safety Regulation, effective 1 September 2024, sets out specific obligations for all work involving crystalline silica. It requires risk assessment, controlled processing, and documentation for every business that cuts, grinds, drills, or clears CSS-containing material on a construction site.
The framework replaced a broad duty-of-care approach with fixed requirements. Before September 2024, silica exposure sat under general WHS duties, open to interpretation on what “reasonably practicable” meant in practice. Chapter 8A removed that ambiguity. It names the materials, sets the exposure threshold, specifies the documentation required, and attaches penalties to gaps in any of it.
Two further instruments built on that base. The Safe Work Australia Model Code of Practice, published November 2025, gives approved guidance that courts can rely on when deciding what a business should reasonably have done. The NSW Silica Worker Register, commencing 1 October 2025, requires registration of workers performing high-risk CSS processing, creating a record that supports early detection before symptoms appear.
Every business operating on a construction site holds these duties independently. A principal contractor’s compliance does not cover a subcontractor’s obligations, and a signed subcontract does not transfer risk. Each party, including directors with personal due diligence duties under section 27 of the WHS Act, manages its own compliance and verifies it on-site, not just on paper.
What Counts as a Crystalline Silica Substance?
A crystalline silica substance is any material containing at least 1% crystalline silica by weight. Concrete, bricks, tiles, pavers, sandstone, asphalt, and both natural and engineered stone all meet that threshold, which places most structural and finishing materials on a construction site inside the regulation’s scope.
The 1% figure is deliberately low. It was set there because crystalline silica does not need to make up most of a material to pose a risk once that material is cut, ground, or drilled. A concrete slab is roughly 70% aggregate, much of which is crystalline silica, so almost any mechanical work on concrete falls under Chapter 8A by default.
Fibre-cement sheeting, render, and cement products also qualify, which catches trades that may not think of themselves as working with “stone.” A plasterer scoring fibre-cement board, a bricklayer cutting pavers to size, or a labourer clearing rubble from a demolished wall are all handling CSS, whether or not silica dust is visible.
The material list matters because the regulation does not classify by trade or task type. It classifies by what the material contains. A business assessing its obligations needs to start from a materials inventory, not a job description, and confirm silica content for anything not already on the recognised list.
Is Dust Clean-Up Classified as Silica Processing?
Yes, dust clean-up is classified as silica processing. Chapter 8A defines processing to include clean-up activities, not just cutting or grinding. Sweeping or vacuuming dust containing crystalline silica is processing under the regulation, which means the same risk assessment and control obligations that apply to cutting a slab apply to clearing dust from the floor afterward.
This catches a category of work most businesses don’t associate with silica risk. A labourer sweeping a site at the end of a shift, a cleaning crew clearing a floor before handover, or a subcontractor dry-brushing dust off a finished surface is performing processing under the same definition that covers a concrete saw. The activity doesn’t need to generate new dust to qualify. Disturbing dust that’s already settled is enough, because dry sweeping and dry vacuuming both lift fine particles back into the air, exactly the exposure pathway the regulation is designed to close.
That reclassification matters most at project handover, when cutting and grinding have finished, but the accumulated dust across the site still needs to be removed. If that clean-up is treated as routine housekeeping rather than CSS processing, it sits outside the regulation’s risk assessment and control requirements, even though the exposure risk hasn’t gone away.
The practical consequence is a control measure, not just a definition. Dry sweeping or dry vacuuming CSS-containing dust falls short of what the regulation requires. Compliant clean-up uses wet suppression, HEPA-filtered vacuum equipment, or another method from the approved hierarchy of controls, the same category of measures required for cutting and drilling.
What Makes Silica Processing “High-Risk”?
Processing is high-risk if it’s reasonably likely to create a health risk to someone at the workplace. Where that’s uncertain, the regulation requires businesses to assume high-risk status applies and document the assessment either way, rather than defaulting to the lower-risk classification.
The assessment itself runs on four factors: the type of processing involved, the crystalline silica content of the material, the frequency and duration of exposure, and whether airborne RCS is likely to exceed half the workplace exposure standard, currently 0.025 mg/m³. Dry cutting a CSS material without any dust control almost always clears that bar. Wet-cut work on the same material, done correctly, may not.
One exclusion trips up more businesses than any other part of this test. Personal protective equipment and administrative controls cannot factor into the high-risk determination. A risk assessment that concludes a task is low-risk because workers will wear P2 respirators has not applied the test correctly, because RPE doesn’t control the hazard at its source and its effectiveness depends entirely on fit, consistent use, and a worker not removing it mid-task. The determination has to be made on the processing itself, before PPE enters the picture at all.
Getting this wrong has a direct downstream effect. A task wrongly classified as low-risk skips the Silica Risk Control Plan, the training requirement, and the monitoring obligations that high-risk status triggers, leaving the business non-compliant on paper as well as on-site.
What Controls Are Required for Compliant Silica Dust Management?
Controlled processing is mandatory for all CSS work, not just tasks classified as high-risk. At minimum, businesses must apply one of the following: wet suppression, on-tool extraction, local exhaust ventilation, isolation of the work area, or an enclosed cabin fitted with HEPA filtration. Respiratory protective equipment is required for whatever risk remains after these controls are in place.
The order matters. Wet suppression and on-tool extraction sit closest to the source of the dust, water keeps particles from becoming airborne in the first place, while on-tool extraction captures them at the cutting or grinding point before they spread. Local exhaust ventilation and isolation manage dust that’s already airborne, drawing it away from workers or containing it within a defined zone. RPE comes last, addressing whatever exposure the earlier controls didn’t eliminate.
RPE can only serve as the sole control where wet suppression, extraction, ventilation, or isolation are genuinely not reasonably practicable, not where they’re inconvenient or slower. A business defaulting straight to P2 respirators without first ruling out the other options hasn’t applied the hierarchy correctly, and that gap shows up in the same risk assessments flagged earlier as the industry’s most common failure point.
Controls also need reviewing as work progresses, not just set up once at project start. A method that suppresses dust effectively on a small cutting task may fall short once the scope shifts to a larger excavation or demolition phase, so businesses need to reassess control adequacy whenever the work itself changes.
What Is the NSW Silica Worker Register?
The NSW Silica Worker Register commenced 1 October 2025 and requires registration of any worker performing high-risk crystalline silica processing. Registration must happen within 28 days of the worker starting that work, and the obligation applies to every PCBU directing high-risk processing, not just principal contractors.
The register exists to close a specific gap: silicosis symptoms can take years to appear, by which point exposure has often continued unchecked for a long time. Building a dataset of who performed high-risk work, and when, gives health authorities a way to trace exposure and act on it before symptoms surface, rather than relying on diagnosis alone to reveal a problem.
Because the register only commenced in October 2025, awareness of it is still uneven across the industry. That gap creates a specific risk on multi-contractor sites, where a principal contractor may assume a subcontractor has registered its workers, and the subcontractor may assume the same in reverse. Neither registers the worker, and the 28-day window passes without anyone noticing until an inspection catches it.
Failure to register is a penalty notice offence in its own right, separate from any penalty attached to the underlying processing work. A business can run a fully compliant risk assessment, apply the correct controls, and still face enforcement action if registration hasn’t happened within the 28-day window.
What Training Is Required for Workers Handling Silica Dust?
Workers involved in high-risk crystalline silica processing must complete approved training before commencing that work. The recognised courses are 10830NAT, CPCSIL3001, and CPCSIL4001, and businesses must keep training records for five years after a worker stops performing that processing.
The three courses aren’t interchangeable options, they sit at different levels depending on the work involved. Training needs to match what a worker actually does on-site, including the specific control measures they’ll be operating, the material types they’ll encounter, and the exposure risks tied to their particular tasks, rather than a single generic silica awareness session applied across an entire workforce regardless of role.
Training obligations extend beyond whoever operates the saw or grinder. Anyone performing high-risk processing needs the approved course, and that includes workers doing dust clean-up classified as processing under Chapter 8A. A cleaning crew clearing dust after cutting work has finished falls under the same training requirement as the crew that did the cutting, a connection that’s easy to miss because clean-up doesn’t look like the kind of task that needs formal silica training.
The five-year retention period exists for the same reason the Silica Worker Register does: exposure effects can take years to surface, and a training record confirms what a worker was qualified to do at the time they were doing it, which matters if a health issue or an inspection surfaces well after the work itself is finished.
What Happens If a Business Doesn’t Comply With Crystalline Silica Regulations?
Non-compliance triggers a range of enforcement responses, from improvement notices through to prohibition notices and penalty notices, issued separately for each distinct failure. A business can face a notice for an inadequate risk assessment, a second for missing training records, and a third for a worker who wasn’t registered within the 28-day window, all from the same site visit.
SafeWork NSW inspectors assess compliance on-site, not on paperwork alone. A subcontractor agreement that lists silica requirements doesn’t satisfy the obligation if workers are angle grinding without extraction while that agreement sits unused in a filing system. Inspectors check what’s happening at the point of processing, and a gap between the documented plan and the actual site conditions is treated as non-compliance regardless of what the contract says.
This is where the non-transferable nature of PCBU duties, introduced earlier, has direct consequences. A principal contractor can’t rely on a subcontractor’s non-compliance as a defence, and a subcontractor can’t rely on the principal contractor’s site-wide rules as a substitute for its own risk assessment. Each PCBU on site answers for its own obligations independently, which means the same failure on the same site can generate separate penalty notices against more than one business.
Directors carry a further layer of exposure. Section 27 of the WHS Act attaches personal due diligence duties to officers, meaning a company’s non-compliance isn’t necessarily contained within the business itself.
How Do the December 2026 Silica Exposure Changes Affect Construction Businesses?
From 1 December 2026, the workplace exposure standard for respirable crystalline silica becomes a workplace exposure limit. The numeric value, currently 0.05 mg/m³ as an eight-hour time-weighted average, may stay the same at first, but the shift from standard to limit changes how the figure functions under the law.
A standard has historically operated as a benchmark businesses work toward, one input among several in a broader risk assessment. A limit operates differently: it’s a threshold that isn’t meant to be exceeded, full stop. The change signals that regulators expect the 0.05 mg/m³ figure to be treated as a hard ceiling from December 2026 onward, not a target businesses can sit close to and still call compliant.
The number itself is also under review. Some bodies are advocating for a reduction to 0.02 mg/m³, which would tighten every control measure built around the current figure. A dust control method that keeps exposure under 0.05 mg/m³ today may not clear a 0.02 mg/m³ limit without meaningful upgrades to extraction, ventilation, or work method.
Businesses building their compliance around the current 0.05 mg/m³ figure and treating it as the finish line are likely to find themselves behind the curve once the transition takes effect. The more resilient position is control measures with margin built in, not controls calibrated to just scrape under today’s number.
Compliant Silica Dust Clean-Up for NSW Construction Sites
Dust clean-up on a construction site falls under the same processing obligations as cutting and grinding, which means the crew handling it needs the same wet suppression, HEPA-filtered extraction, and documented control measures required elsewhere on site. Cleanin provides construction cleaning across Greater Sydney, covering post-construction and site clean-up work aligned with Chapter 8A requirements.
Details on service scope, available packages, and facility coverage are outlined at cleanin.com.au/service-packages/. To discuss a specific site or project, call 1300 50 55 50.
Frequently Asked Questions
Do subcontractors have separate obligations from principal contractors under Chapter 8A?
Yes, subcontractors have separate obligations from principal contractors under Chapter 8A. Subcontractors are PCBUs in their own right, with obligations that sit alongside the principal contractor’s, not beneath them. Each subcontractor must independently assess its CSS processing tasks, apply required controls, and register high-risk workers, regardless of what the principal contractor has arranged site-wide.
Does a cleaning company need a Silica Risk Control Plan?
If a cleaning crew’s work is classified as high-risk Crystalline Silica Substance processing, which includes dust clean-up using dry methods on CSS-containing material, a Silica Risk Control Plan is required for that task. The determination follows the same test applied to cutting and grinding: type of processing, material content, and exposure duration.
How long do silica compliance records need to be kept?
Retention periods vary by record type. Training records must be kept for five years after a worker stops performing high-risk processing, while health monitoring records must be kept for 30 years. Both periods reflect the long latency between silica exposure and the appearance of symptoms.
When does air monitoring become mandatory?
Air monitoring is required when there’s uncertainty about whether airborne RCS exceeds the workplace exposure standard, currently 0.05 mg/m³. If monitoring results show an exceedance, the result must be reported to SafeWork NSW within 14 days through the online portal.
Can PPE alone justify classifying a task as low-risk?
No, PPE alone does not justify classifying a task as low-risk. Personal protective equipment and administrative controls are excluded from the high-risk determination entirely. A risk assessment that relies on P2 respirators to justify a lower-risk classification hasn’t applied the test correctly, since RPE doesn’t control the hazard at its source.
