Stairs Installation (Residential / Modular) SWMS

Residential and modular stair installation involves receiving prefabricated flights, manoeuvring heavy timber or steel assemblies into stairwell voids, plumbing and fixing stringers to upper landings, and verifying tread, riser and balustrade dimensions against AS 1657 and the NCC Volume Two. The work routinely occurs at the framing or lock-up stage when floor penetrations remain open, edge protection is incomplete and other trades share the void. Under WHS Regulation 2025 section 291, installation work involving a risk of a person falling more than two metres and work requiring temporary load support is classified as High Risk Construction Work, triggering a mandatory Safe Work Method Statement before any work commences. The combined manual handling demand of lifting full flights, the dynamic fall exposure into the stairwell void, and the structural consequence of a non-compliant install make a documented SWMS the primary legal and operational control for carpenters, site supervisors and the PCBU.

Hazards identified

7 hazards covered, sorted by priority.

Control measures

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

1. 1Elimination — Where design permits, specify ground-floor prefabrication and lift complete stair tower as one piece using a crane to eliminate working over an open void.
2. 2Elimination — Sequence stair install before upper-floor framing only when void cover or fall arrest can be fully maintained, removing concurrent multi-trade void exposure.
3. 3Substitution — Replace solid timber flights over 80kg with modular split-flight systems delivered as half-flights to halve manual handling load on each lift team.
4. 4Engineering — Install Class A void covers or 2.1m high temporary guardrails to AS/NZS 4994.1 around the stairwell perimeter before flights are positioned into the void.
5. 5Engineering — Use mechanical stair dollies, genie lifts or crane slings rated to flight mass for all positioning; prohibit unassisted carrying of full flights up partial stairs.
6. 6Engineering — Fix temporary 900mm handrail and mid-rail to stringers immediately after flight is secured, prior to any further access, complying with AS 1657 clause 5.
7. 7Administrative — Conduct documented pre-start using this SWMS, confirm two-person minimum lift teams, verify AS 1657 dimensional check sheet and isolate work area from other trades.
8. 8Administrative — Restrict access to the stairwell zone with hard barricades and signage during install; only competent carpenters holding general construction induction enter the exclusion zone.
9. 9PPE — Cut-resistant Level C gloves to AS/NZS 2161.3, steel-cap safety boots to AS/NZS 2210.3, and safety eyewear to AS/NZS 1337.1 worn throughout positioning and fixing.
10. 10PPE — Where void cannot be fully covered, full body harness and energy-absorbing lanyard to AS/NZS 1891.1 anchored to certified point above the working position.

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

On a two-storey townhouse project at lock-up stage, a lead carpenter and apprentice are scheduled to install a prefabricated MDF stair flight weighing approximately 110kg into the central stairwell. At the 6:45am pre-start, the supervisor opens this SWMS on a tablet and walks both workers through each hazard line. They identify that the upper-floor void currently has only a single timber rail — falling short of the SWMS engineering control requiring AS/NZS 4994.1 compliant guardrails. Work is paused while a second mid-rail and toe-board are added. The team then confirms the manual handling control: the flight will be moved on a stair dolly to the void edge, then lifted by three workers (one extra called in) rather than two, because the mass exceeds the 80kg substitution threshold flagged in the controls. Both workers sign the SWMS register acknowledging the harness anchor point identified above the upper landing. Mid-task, the apprentice notices the lower stringer is binding on a protruding nogging. Rather than forcing the fit, he stops work — as the SWMS dynamic-review clause instructs — and the supervisor amends the SWMS with a noted variation before the nogging is trimmed. The flight is then seated, temporary handrail fitted within ten minutes of fixing, and AS 1657 dimensional check sheet completed and filed against the SWMS record.

Related legislation

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

Frequently asked questions