Building Deconstruction SWMS

Building deconstruction is the planned, top-down demolition of a complete structure, taken down in a controlled sequence so that each load-bearing element is removed only after the loads it carries have been relieved. A Safe Work Method Statement is mandatory because the work is high risk construction work under the Work Health and Safety Regulation on several counts at once — demolition of load-bearing elements, work at heights above 2 m, likely disturbance of asbestos, structural alterations requiring temporary support, and the movement of powered mobile plant. The dominant hazard is uncontrolled or premature collapse: when an element is removed out of sequence, loads redistribute in ways the remaining structure was never designed to carry. Layered onto that are falls from open edges and penetrations on partly demolished floors, fibre release where asbestos is present, confined-space and silica-dust exposure, service strikes, and the public-protection duty around the site boundary. This SWMS ties the work to an engineered demolition method statement, staged exclusion zones, and the completion of any licensed asbestos removal and clearance before structural demolition proceeds. It is supplied in eight jurisdiction editions; each cites its own Act, Regulation and regulator, and the demolition-licensing position is set out per state, since only New South Wales, Queensland and Western Australia license demolition under WHS law. It supports licensed work — it does not replace the demolition licence or authorisation.

Hazards identified

8 hazards covered, sorted by priority.

Control measures

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

1. 1Elimination — Sequence top-down deconstruction so each element is removed in a controlled order at its source, eliminating uncontrolled collapse and fall-of-material before it can occur
2. 2Substitution — Substitute remote or long-reach mechanical deconstruction for hand demolition at height wherever the structure allows, keeping workers out of the collapse zone
3. 3Engineering — Demolition Method Statement signed by a chartered (NER/CPEng) structural engineer defining the load path and removal sequence
4. 4Engineering — Perimeter and edge protection, fans and catch decks to contain falling material within the site
5. 5Engineering — Dust suppression by water knockdown on all cutting, breaking and load-out to control silica and fibre
6. 6Administrative — Pre-demolition asbestos audit by a Licensed Asbestos Assessor with intrusive sampling before demolition starts
7. 7Administrative — Staged exclusion zones, spotters and a powered-plant traffic-management plan separating workers from machines
8. 8Administrative — Hold points after each stage, with engineer sign-off before the next load-bearing element is removed
9. 9PPE — Type 1 hard hat with chin strap, mandatory site-wide, with impact eye protection and high-visibility clothing
10. 10PPE — P2/P3 respiratory protection for silica and fibre tasks, selected and fit-tested to the exposure

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

At 7:00 am a deconstruction crew from Meridian Demolition starts the third day of taking down a four-storey concrete frame. The engineered method statement is on site and the supervisor confirms the previous stage's hold-point sign-off before work resumes. Edge protection and a catch deck are checked on the open western face where the slab was cut back the day before. Workers near the open edges are on fall-arrest anchored to certified points, and a spotter controls the exclusion zone beneath the long-reach excavator working the top floor. Water knockdown runs on every cut to hold down silica and any residual fibre, and a small pocket of bonded sheet flagged in the asbestos audit is left untouched until the licensed crew clears it. Mid-morning, an unexpected crack is noticed in a column the sequence had not yet relieved; work stops, the engineer is called, and the removal order is revised before anyone proceeds. Only after the column is propped and signed off does the crew take the next load-bearing element, working strictly top-down to the approved sequence.

Related legislation

• WHS Act 2011 (model)
• WHS Regulation 2025
• AS 2601 The demolition of structures
• Demolition Work Code of Practice

Frequently asked questions