Hazmat-Controlled Demolition SWMS

Hazmat-controlled demolition involves the staged dismantling of structures contaminated with multiple hazardous materials — typically lead-based paint, PCB-containing fluorescent ballasts and capacitors, friable and bonded asbestos, and contaminated surrounding soils. The work begins with a Division 6 hazardous materials survey, progresses through sequenced source removal under licensed conditions, and only then permits structural demolition with segregated waste streams tracked to EPA-licensed receivers. Because this work simultaneously triggers multiple High Risk Construction Work categories under section 291 of the WHS Regulation 2025 — including work involving asbestos, demolition of load-bearing elements, and exposure to hazardous chemicals — a Safe Work Method Statement is mandatory before any work commences and must be reviewed at each phase trAS/NZStion. The SWMS must be developed in consultation with workers, signed by all persons performing the work, kept accessible at the site, and retained for the statutory period (or longer where a notifiable incident occurs).

Hazards identified

7 hazards covered, sorted by priority.

Control measures

Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.

1. 1Elimination — Where structurally viable, retain and refurbish rather than demolish; eliminate the hazmat disturbance pathway entirely by adaptive reuse of the existing envelope.
2. 2Elimination — Remove all identified hazardous materials (asbestos, PCB ballasts, lead paint, contaminated soil) under licensed conditions before any structural demolition commences, eliminating combined exposure.
3. 3Substitution — Replace dry mechanical stripping of lead paint with chemical gel strippers or infrared paint removers that suppress dust generation at the source.
4. 4Substitution — Substitute high-energy demolition (ball, explosive) with low-energy deconstruction using shears and nibblers on contaminated elements to reduce fibre and dust liberation.
5. 5Engineering — Establish full negative-pressure enclosures with HEPA-filtered extraction (minimum -5 Pa) for Class A asbestos removal areas per the Code of Practice 2021.
6. 6Engineering — Deploy continuous atomised water misting, wheel-wash bays, and perimeter wind fencing to suppress and contain contaminated dust migration from the work zone.
7. 7Administrative — Issue a phase-gated demolition sequence permit signed by the supervisor at each trAS/NZStion (survey → asbestos → lead → PCB → soil → structure), with hold points verified by clearance certificates.
8. 8Administrative — Conduct daily pre-start SWMS reviews, exposure monitoring per AS 3640, biological health monitoring for lead, and toolbox briefings before any change to scope, plant or substrate.
9. 9PPE — Mandate Class P3 full-face powered air-purifying respirators, disposable Type 5/6 coveralls, nitrile under-gloves with chemical over-gloves, and decontamination via three-stage shower unit.
10. 10PPE — Provide cooling vests, mandated rest-water-shade cycles, and buddy-system observation when ambient WBGT exceeds 28°C to manage PPE-induced heat load.

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

On a four-storey 1970s commercial office demolition in a metropolitan CBD, the site supervisor opens the pre-start brief at 6:45am by walking the crew through the Hazmat-Controlled Demolition SWMS at the site shed. The hazmat survey register identifies vermiculite insulation in the ceiling void (Level 3), PCB ballasts across all original light fittings, lead paint on the structural steel, and elevated lead-in-soil readings along the eastern boundary. Using the SWMS hazard matrix, the supervisor confirms today's scope is Phase 2 — PCB ballast removal — and walks through the sequenced controls: isolation and lockout of the distribution board, double-bagging of intact ballasts into UN-approved containers, and immediate spill kit deployment if any capacitor ruptures. Each worker signs the SWMS sign-on register, confirms P3 PAPR fit-test currency, and dons Type 5/6 coveralls at the clean-side decontamination unit. Mid-task, a labourer reports a fractured ballast leaking oil onto the slab. The supervisor halts the area, references the SWMS escalation flowchart, isolates a 3-metre exclusion zone, deploys the PCB spill kit, and amends the SWMS dynamic-risk addendum on the tablet — re-briefing the crew before resuming. The amended SWMS is countersigned and retained with the project hazmat file for the statutory minimum period.

Related legislation

• WHS Act 2011 (model)
• WHS Regulation 2025
• How to Manage and Control Asbestos in the Workplace CoP

Frequently asked questions