Cantilever Scaffold Erection SWMS

Cantilever scaffold erection involves projecting a working platform horizontally from a building face without ground-bearing standards, relying entirely on needle beams, counterweights and structural tie-ins to resist overturning and gravity loads. This work is classified as High Risk Construction Work under WHS Regulation 2025 r291 because it combines work at heights exceeding two metres, structural alterations affecting load paths, and the risk of objects falling onto persons below. A documented SWMS is mandatory before any work commences and must be developed in consultation with the scaffolders, riggers and engineers involved. The scaffold must be designed by a competent person under AS/NZS 1576.1, erected only by licensed scaffolders holding the relevant High Risk Work Licence class, and verified by load calculation before any worker accesses the cantilevered deck. This SWMS template addresses the unique failure modes of cantilever systems — needle beam deflection, counterweight migration, tie-in pull-out and uncontrolled tool drop — that ground-supported scaffolds do not present.

Hazards identified

7 hazards covered, sorted by priority.

Control measures

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

1. 1Elimination — Where facade access can be achieved by mobile elevating work platform or mast climber, eliminate cantilever scaffold entirely and document the alternative in the SWMS.
2. 2Elimination — Remove all non-essential personnel and public access from the fall zone below using hard barricades extending the scaffold height plus three metres.
3. 3Substitution — Substitute traditional needle beam cantilevers with engineer-certified proprietary cantilever transom systems carrying current AS/NZS 1576.3 component certification and load tables.
4. 4Engineering — Engage a chartered structural engineer to produce stamped design drawings, load calculations and tie-in schedules verified against substrate pull-out tests before erection commences.
5. 5Engineering — Install perimeter catch fans, debris netting and toeboards compliant with AS/NZS 1576.1 clause 2.7 to capture dropped objects before they reach lower levels.
6. 6Engineering — Fit continuous guardrails, midrails and kickboards on all open edges progressively as the cantilever extends, never leaving an unprotected leading edge between shifts.
7. 7Administrative — Permit erection only by scaffolders holding Advanced Scaffolding High Risk Work Licence under WHS Regulation 2025 Schedule 3, verified at sign-on.
8. 8Administrative — Conduct documented pre-start brief using this SWMS, monitor wind speed with calibrated anemometer and cease work when sustained wind exceeds the engineer-specified threshold.
9. 9Administrative — Implement scaffold tag system inspected by competent person at handover, after alteration, after weather event and at intervals not exceeding thirty days per AS/NZS 1576.1.
10. 10PPE — Issue compliant industrial safety helmets with Y-suspension chinstraps to AS/NZS 1801, full-body harnesses to AS/NZS 1891.1 with twin lanyards, tool tethers and high-visibility clothing for all workers on the deck.

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

On a six-storey adaptive reuse project where ground-level heritage colonnades prevent standard scaffold founding, the scaffold supervisor convenes a pre-start brief at level three on a Tuesday morning. He distributes the Cantilever Scaffold Erection SWMS to the four-person crew and walks through each hazard line. The team confirms the engineer's stamped drawing nominates 3.6 metre needle beam projection with counterweights of 1.8 tonnes per beam, and the substrate pull-out test certificate from the prior day is sighted and stapled to the SWMS. The leading hand identifies that overnight rain has wet the through-bolt locations, so the crew adds an additional administrative control to the SWMS: torque-check every tie before deck loading. Each worker signs the consultation register, dons harness and helmet with chinstrap, and tethers their podgers and spanners. Mid-shift, the anemometer mounted on the hoist tower registers a sustained gust of 42 km/h, exceeding the engineer's 36 km/h working limit. The supervisor halts work, evacuates the cantilever, re-tags the scaffold as incomplete, and records the stoppage on the SWMS amendment page. Work resumes only after wind drops and a fresh sign-on is completed, demonstrating the SWMS functioning as a live document rather than a filing-cabinet artefact.

Related legislation

• WHS Act 2011 (model)
• WHS Regulation 2025
• Managing the Risk of Falls at Workplaces CoP

Frequently asked questions