NZ Silica Dust Regulations 2026: What Every Tradie Needs to Know

Silica dust is invisible, odourless — and it can kill. WorkSafe New Zealand has ramped up enforcement around respirable crystalline silica (RCS) exposure, and in 2026 the pressure on tradies to comply has never been higher. Whether you're cutting concrete, grinding stone benchtops, drilling into masonry, or tiling, this regulation affects you directly.

Here's what you need to know, what WorkSafe expects, and what the penalties are for getting it wrong.

What Is Respirable Crystalline Silica (RCS)?

Silica is a naturally occurring mineral found in sand, stone, concrete, brick, and mortar. When you cut, grind, drill, or sand these materials, microscopic particles become airborne. Particles small enough to reach deep into the lungs are called respirable crystalline silica (RCS).

Prolonged exposure causes silicosis — an incurable, progressive, and potentially fatal lung disease. Silicosis can develop after just a few years of high exposure. Other conditions linked to RCS include lung cancer, COPD, and kidney disease.

WorkSafe NZ identifies RCS as one of the most serious occupational health hazards in the construction industry. Unlike a broken arm, the damage builds invisibly over years — by the time symptoms appear, it's often too late to reverse.

Which Trades Are at Risk?

WorkSafe's guidance makes clear that RCS risk is not limited to one trade. You're likely exposed if your work involves:

• Stonemasons and kitchen/benchtop installers — engineered stone (like Silestone and Caesarstone) contains up to 93% silica, far higher than natural stone
• Concrete and masonry workers — cutting blocks, grinding slabs, drilling anchor bolts
• Tilers and floor layers — cutting ceramic, porcelain, and stone tiles
• Builders and carpenters — drilling into brick or concrete substrates
• Earthmoving and civil workers — disturbing silica-rich soil or aggregate
• Demolition workers — breaking up concrete structures
• Plasterers — sanding render with silica content

If your crew regularly performs any of these tasks without controls in place, you're likely breaching the Health and Safety at Work Act 2015 (HSWA) and WorkSafe's associated regulations.

The Legal Framework: What WorkSafe Requires

Under the HSWA, every Person Conducting a Business or Undertaking (PCBU) has a primary duty to ensure — so far as is reasonably practicable — that workers are not exposed to health and safety risks. For silica dust, "reasonably practicable" has a well-established meaning backed by WorkSafe's Good Practice Guides on Dust.

WorkSafe expects a hierarchy of controls approach:

1. Elimination (Remove the Hazard)

Can you use a pre-cut product or a lower-silica alternative? If yes, do it.

2. Substitution

Use materials with lower silica content where possible. Low-silica grouts and mortars exist for many applications.

3. Engineering Controls (Priority)

This is where WorkSafe focuses most enforcement: - Wet cutting — water suppression systems dramatically reduce airborne dust - On-tool extraction (OTE) — vacuum systems attached directly to angle grinders, core drills, and saws - Local exhaust ventilation (LEV) — for indoor workshops and benchtop fabrication

From 2026, WorkSafe inspectors specifically look for evidence of on-tool extraction on site. Dry cutting without dust controls is treated as a serious compliance failure.

4. Administrative Controls

• Rotate workers to reduce individual exposure time
• Schedule high-dust tasks at the start of the day before others arrive
• Post exclusion zones around cutting areas
• Provide site induction training that specifically covers silica risks

5. Personal Protective Equipment (PPE) — Last Resort

Respiratory protective equipment (RPE) must be used in addition to engineering controls, not instead of them. WorkSafe requires:

• P2-rated respirators (or better) for RCS — standard dust masks are not adequate
• Fit testing for all workers who wear tight-fitting respirators
• Records of fit testing maintained on site
• RPE must be cleaned, stored, and replaced according to manufacturer schedules

Engineered Stone: The High-Risk Material

Australia moved to ban engineered stone benchtops in July 2024, becoming the first country in the world to do so after a wave of young stonemason deaths from silicosis. New Zealand has watched closely.

As of 2026, New Zealand has not implemented a full ban, but WorkSafe NZ has issued strong guidance that engineered stone fabrication and installation must only occur with the highest level of dust controls in place. WorkSafe field inspectors are visiting kitchen and benchtop businesses with increasing frequency.

If you install or fabricate engineered stone, you need: - Full wet cutting or on-tool extraction at all times - A written silica dust management plan - Health monitoring for all workers regularly exposed - Evidence that workers have been trained on the risks

Failure to have these controls in place puts your business at serious legal risk — and more importantly, it puts your workers' lives at risk.

Health Monitoring: Who Needs It?

WorkSafe's guidance recommends health monitoring for workers with regular and ongoing exposure to RCS above the Workplace Exposure Standard (WES). The WES for RCS in New Zealand is 0.025 mg/m³ as an 8-hour time-weighted average.

In practical terms, if a worker regularly dry-cuts concrete, grinds engineered stone, or drills masonry without adequate controls, they are very likely exceeding the WES.

Health monitoring typically includes: - Baseline chest X-ray or CT scan before starting high-exposure work - Annual or biennial follow-up spirometry and imaging - Records kept and provided to workers - Referral to an occupational physician if abnormalities are found

WorkSafe does not mandate health monitoring for all workers in all situations, but failing to provide it for high-exposure workers creates significant PCBU liability. Speak to an occupational health provider about a monitoring programme appropriate for your team.

For accurate budgeting of your health and safety spend, use the NZ Tradie Job Costing Calculator to include compliance costs in your project quotes.

Record Keeping Requirements

WorkSafe expects you to maintain: - Dust management plan for the worksite - Training records showing workers have received silica dust induction - Equipment maintenance logs for wet cutting systems and OTE vacuums - Health monitoring records (held for at least 40 years per WorkSafe guidance — silicosis has a long latency period) - Incident and near-miss records relating to dust exposure

These records must be available for WorkSafe inspectors on request. If your business uses job management software like Fastcrew, you can store site compliance documents against each job record for easy access.

What Are the Penalties?

Breaches of the HSWA can result in:

Beyond fines, WorkSafe can issue Improvement Notices requiring immediate action, Prohibition Notices shutting down work activities, and Infringement Notices (on-the-spot fines) for specific breaches.

The reputational and financial damage of a WorkSafe prosecution — or worse, a silicosis claim from a former worker — far outweighs the cost of proper controls.

For more on your WorkSafe obligations, read our NZ WorkSafe Notifiable Events Guide and our Health and Safety Guide for NZ Tradies.

Practical Checklist for Your Business

Before your next job involving concrete, masonry, or engineered stone, run through this:

• [ ] On-tool extraction vacuum in good working order with filters checked
• [ ] Wet cutting equipment available and functional
• [ ] P2 respirators (fit tested) available for all workers on the task
• [ ] Workers have received silica dust training in the last 12 months
• [ ] Dust management plan documented for the site
• [ ] Health monitoring programme in place for regularly exposed workers
• [ ] Relevant records stored and accessible

Download Free Templates

Silica dust management plans, site induction checklists, and health monitoring registers are available free for NZ tradies. Download our free NZ tradie templates at tradietools.nz/templates/ to get your documentation in order before WorkSafe comes knocking.

NZ Tradie Tools provides free calculators, templates and guides for New Zealand tradies. Visit tradietools.nz.