Mechanical Demolition SWMS
Mechanical demolition of buildings using excavator with hydraulic shears, hammers, processors. Sequenced top-down or hi-reach demolition, dust suppression, structural collapse zones, debris removal.
SWMS variants reference your state’s WHS legislation. Instant download after payment.
Mechanical demolition involves the planned, sequenced destruction of structures using powered mobile plant — typically tracked excavators fitted with hydraulic shears, pulverisers, processors, or hammer attachments, and in taller works, high-reach demolition rigs. The work generates extreme structural collapse risk, uncontrolled debris fall, respirable crystalline silica, and significant powered-plant interaction zones. Under the WHS Regulation 2025, mechanical demolition of load-bearing structures, structures over 6 metres, and work involving powered mobile plant in a collapse zone is High Risk Construction Work under section 291, mandating a Safe Work Method Statement before work commences. The SWMS must be developed in consultation with workers, kept available for inspection by the regulator, and reviewed whenever the sequence, plant, or structural condition changes. This document discharges the PCBU's duty under section 19 of the WHS Act and regulations 291–299 covering construction work and demolition notification.
Hazards identified
7 hazards covered, sorted by priority.
Crushing fatalities, multi-storey debris cascade, plant burial, and Category 1 reckless conduct prosecution against the PCBU and supervisor
Operator fatality from cabin crush, attachment ejection, and breach of regulation 215 powered mobile plant duties
Accelerated silicosis, lung cancer, chronic obstructive pulmonary disease, and notifiable workplace exposure standard breach
Penetrating head injuries, fatal strikes to ground crew, and damage to adjoining properties or public footpaths
Airborne fibre release, mandatory site shutdown, mesothelioma latency exposure, and prosecution under asbestos regulations 419–434
Arc flash fatality, gas explosion, flooding, and notifiable incident under sections 35–38 of the WHS Act
Run-over fatalities of spotters, dogmen, and truck drivers within the slewing radius and blind-spot envelope
Control measures
Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.
- 1Elimination — Eliminate manual workers from the collapse zone and slew radius by executing demolition entirely with remote/cab-operated plant and a hard-barricaded exclusion perimeter set at 1.5× structure height.
- 2Elimination — Remove all hazardous materials (asbestos, PCBs, residual chemicals, fuels) via licensed soft-strip before mechanical demolition begins, verified by clearance certificate.
- 3Substitution — Substitute hydraulic shears and pulverisers for percussive hammers wherever feasible to reduce vibration, dust generation, and uncontrolled fragment ejection.
- 4Substitution — Use high-reach demolition excavators instead of explosive or top-down manual deconstruction on structures above 20 metres to keep operators outside the collapse footprint.
- 5Engineering — Implement continuous water suppression via fixed misting cannons and boom-mounted spray bars maintaining visible damp surfaces per AS 2436 dust control requirements.
- 6Engineering — Install ROPS/FOPS certified cabs with attachment guarding, polycarbonate front screens, and reinforced cab roofs rated to the falling object risk identified in the structural engineer's sequence plan.
- 7Administrative — Follow the engineer-endorsed demolition sequence plan with daily pre-start verification of structural stability, exclusion zone integrity, and updated hazard register before plant start-up.
- 8Administrative — Operate only with HRWO-licensed plant operators, demolition supervisors holding the unrestricted demolition licence, and trained spotters maintaining two-way radio contact and positive communication protocols.
- 9PPE — Issue P2/P3 respirators, impact-rated hard hats, Class 5 high-visibility clothing, Class 1 eye protection, steel-capped boots, and Class 5 hearing protection for any worker entering the active zone.
- 10PPE — Provide cut-resistant gloves and forearm protection for ground crews handling sheared reinforcement and processed debris during loadout and segregation activities.
Applicable Codes of Practice
Mandates sequenced demolition planning, exclusion zones, engineer involvement for load-bearing structures, and SWMS content specific to mechanical demolition method.
Sets the technical demolition standard including survey requirements, sequencing, propping, and controls referenced by the WHS regulator as the accepted industry benchmark.
Governs powered mobile plant duties under regulations 213–216 including operator competency, attachment certification, and exclusion of persons from operating zones.
Binding exposure limit under regulation 49 triggering air monitoring, health surveillance under regulation 368, and engineering dust controls during concrete processing.
High-Risk Construction Work triggered
Mechanical demolition by definition removes load-bearing slabs, columns, beams, and shear walls in sequence, meeting the section 291 trigger from day one of works.
Urban demolition sites routinely interface with active road corridors during debris haulage, hoarding installation, and lay-down — engaging traffic-management duties under section 291.
PCBUs must prepare, consult workers on, and retain this SWMS for at least two years post-incident under regulation 299; failures attract Category 1–3 offences with penalties that are substantial and indexed annually under the prevailing WHS penalty schedule.
Who this is for
- →Licensed demolition contractors on commercial and industrial projects
- →Principal contractors managing tier 1 redevelopment sites
- →Plant operators running excavator-mounted shears and processors
- →WHS managers overseeing high-reach demolition programmes
What you receive
- ✓Editable DOCX template — Microsoft Word compatible
- ✓State-specific WHS legislation schedule (NSW/VIC/QLD/SA/WA/TAS/NT/ACT)
- ✓Hazard register with risk ratings + hierarchy-of-control mapping
- ✓Worker sign-on register, pre-start checklist, and incident escalation flow
Worked example
On a six-storey commercial strip-out and demolition project in a mixed-use precinct, the demolition supervisor convenes the Monday pre-start brief at 6:30am with the excavator operator, two spotters, a water-cart driver, and the loadout crew. The supervisor opens this SWMS on a ruggedised tablet and walks through the hazard register against today's task: pulverising the level-three slab edge using a 50-tonne high-reach excavator with rotating pulveriser. The team confirms the engineer's sequence drawing matches the current structural state — yesterday's column drops are verified stable. The supervisor highlights control 1 (1.5× height exclusion zone, today set at 32 metres), control 5 (misting cannon repositioned to upwind corner), and control 7 (daily structural verification signed by the demolition engineer at 6:00am). Each worker signs onto the SWMS digitally, including the new dogman who receives a verbal walk-through of the slew radius and positive-communication protocol. Mid-morning, the operator radios that he has exposed an unexpected services penetration in the slab. Work stops, the SWMS is reopened, hazard 6 (unidentified services) is reviewed, the services locator is recalled to site, and the amendment is recorded against the SWMS revision log before any further attachment engagement resumes.
Related legislation
- WHS Act 2011 (model)
- WHS Regulation 2025
- AS 2550 — Cranes, hoists and winches; AS 1418 series
Frequently asked questions
Is mechanical demolition high risk construction work?
Yes, from day one of the works. Taking down load-bearing slabs, columns, beams and shear walls in sequence is demolition of elements related to the physical integrity of the structure under WHS Regulation s291(c). Excavators, processors and haulage moving through the footprint make it s291(o). Urban sites that interface with a live road corridor during debris haulage, hoarding installation and lay-down also engage s291(n). Section 299 requires the SWMS before work commences, developed in consultation with workers, available for inspection by the regulator, and reviewed whenever the sequence, the plant or the structural condition changes.
How large does the exclusion zone around the structure need to be?
The SWMS sets a hard-barricaded perimeter at 1.5 times the height of the structure being demolished — for a six-storey building that is in the order of 30 metres, not a line of bunting at the fence. The purpose is to keep every person out of both the collapse footprint and the slew radius of the machine, so demolition runs with cab or remote-operated plant and nobody on foot inside the zone. Where ground crews work near the loadout, trained spotters hold two-way radio contact on a positive-communication protocol rather than hand signals across a dust cloud.
What licences do the operator and the supervisor need?
Plant operators need the relevant high risk work licence for the machine they are running, and the demolition supervisor needs the demolition licence or authorisation their jurisdiction requires, the class of which depends on the structure and the method. Only some states license demolition under WHS law, and the state edition sets out the position that applies there. Spotters must be trained in the emergency stop and communication protocol before entering the zone. The SWMS documents how licensed work will be carried out; it is not a substitute for the licence or the notification that goes with it.
Should we be using shears and pulverisers or a hammer attachment?
Shears and pulverisers wherever the element allows. Percussive hammers generate more dust, more vibration and far more uncontrolled fragment ejection, and ejected reinforcement is what reaches ground crews and adjoining property. On taller structures a high-reach demolition rig also keeps the operator outside the collapse footprint rather than working top-down from within it. Whichever attachment is used, the cab must be ROPS and FOPS certified with attachment guarding, a polycarbonate front screen and a roof rated to the falling-object risk identified in the structural engineer's sequence plan — not the standard earthmoving configuration.
How is silica dust controlled across a whole demolition footprint?
By wetting material as it is processed, not by spraying the air afterwards. Fixed misting cannons and boom-mounted spray bars run continuously to keep surfaces visibly damp through pulverising and slab processing, and the target is the 0.05 mg/m3 eight-hour workplace exposure standard for respirable crystalline silica, with air monitoring and health monitoring for exposed workers. Suppression only works if the hazardous materials are already out: asbestos, PCBs and residual chemicals are removed under licensed soft strip and verified by clearance certificate before any mechanical breaking begins.
Document details
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