AS/NZS 1891 Explained: What Building Owners Need to Know About Height Safety Compliance

AS/NZS 1891 is the Australian and New Zealand standard that governs personal equipment used for work at height. If your building has anchor points, static lines, or any fall protection system that workers clip into, this standard applies to you as the building owner or facilities manager.

The 2025 revision updated testing requirements, load ratings, and documentation obligations across all four parts. Understanding what each part covers, and where it intersects with your duties under the WHS Act, keeps you on the right side of compliance and protects the workers accessing your roof.

The Four Parts of AS/NZS 1891

The standard is structured in four parts, each addressing a different category of personal fall protection equipment. They are designed to work together, not in isolation.

Part 1: Industrial Fall-Arrest Systems and Devices

AS/NZS 1891.1:2025 covers the equipment workers wear and carry: harnesses, lanyards, energy absorbers, and self-retracting devices. It sets the manufacturing, testing, and performance requirements for each item.

For building owners, Part 1 is relevant because it defines what equipment is acceptable for use on your anchor systems. If a contractor arrives with fall arrest equipment that does not meet Part 1, and an incident occurs on your roof, your compliance position becomes difficult to defend. Your anchor systems are only as useful as the equipment clipped to them.

Part 1 also establishes the concept of the fall arrest system as a whole. A harness, lanyard, energy absorber, and anchor point are assessed together. The anchor must be capable of absorbing the forces generated by the equipment connected to it, which is where AS 5532:2025 becomes relevant (more on that below).

Part 2: Horizontal Lifeline Systems

AS/NZS 1891.2:2025 covers static line systems, also called horizontal lifelines. These are tensioned cable or rail systems installed across a roof that allow workers to travel continuously without disconnecting their harness.

The standard specifies design loads, anchor termination requirements, intermediate support spacing, and the documentation that must accompany a certified installation. A horizontal lifeline is not simply a wire strung between two anchor points. The system must be engineered to account for the dynamic loads generated when a worker falls mid-span, which can be substantially higher than the static load at the anchor.

For facilities managers overseeing buildings with long roof runs, plant rooms, or areas requiring frequent maintenance access, Part 2 systems are often the appropriate solution. They reduce the number of times a worker must disconnect and reconnect, which is statistically when most incidents occur.

Part 3: Fall-Arrest Devices Associated with a Vertical Rigid Rail

AS/NZS 1891.3:2025 addresses vertical rail systems, typically used on fixed ladders and tower structures. The device travels with the worker as they climb and locks in the event of a fall.

This part is less commonly encountered in standard commercial building compliance, but it becomes relevant for buildings with fixed ladder access to rooftop plant, cooling towers, or elevated structures. If your building has a fixed ladder more than 3 metres in height, AS 1657 and Part 3 of AS/NZS 1891 both apply.

Part 4: Selection, Use, and Maintenance

AS/NZS 1891.4:2025 is the operational part of the standard. It covers how fall protection equipment should be selected, inspected, used, and maintained. It also sets out the inspection intervals and record-keeping requirements that building owners must satisfy.

Part 4 is arguably the most directly relevant to building owners and strata committees because it defines ongoing obligations, not just installation requirements. A compliant anchor system installed in 2022 does not stay compliant on its own. Part 4 requires periodic inspection by a competent person, documentation of those inspections, and removal from service of any equipment that fails inspection criteria.

The 2025 revision tightened the definition of a "competent person" for inspection purposes and introduced more specific requirements around inspection records, including the information that must be captured and how long records must be retained.

The Difference Between AS/NZS 1891 and AS 5532

Building owners frequently ask why there are two standards in play when they commission anchor point work. The distinction matters.

AS/NZS 1891 governs the personal fall protection equipment that workers use: harnesses, lanyards, and the systems those items connect to. AS 5532:2025 governs the anchor devices themselves, specifically single-point anchors permanently installed in a structure.

Think of it this way: AS 5532 sets the requirements for the anchor point as a manufactured and installed product. AS/NZS 1891 sets the requirements for the system that connects to it and how that system must be managed over time.

A single-point anchor installed to AS 5532:2025 must be rated to either 15kN or 21kN depending on the number of users, must be installed by a licensed installer, and must be accompanied by a certification document. Once installed, it enters the AS/NZS 1891.4 inspection regime, which requires periodic recertification to confirm the anchor remains structurally sound and the installation has not been compromised by corrosion, substrate movement, or physical damage.

For building owners, both standards are in play simultaneously. Commissioning an anchor installation means you need a product and installation that meets AS 5532, and you need an ongoing management programme that meets AS/NZS 1891.4.

Single-Point Anchors vs Horizontal Lifeline Systems

The choice between single-point anchors and a horizontal lifeline system depends on the nature of the work being performed on your roof, the frequency of access, and the roof geometry.

Single-point anchors are fixed to the roof structure at individual locations. A worker clips their lanyard to the anchor and works within the radius permitted by their lanyard length. They must disconnect and move to a new anchor if they need to travel beyond that radius. Single-point anchors are rated for one or two users simultaneously, depending on the anchor specification.

Single-point anchors are appropriate where roof access is infrequent, the work area is confined, and the number of workers on the roof at any time is small. They are lower in installation cost than a static line system, but they impose a procedural discipline on workers: every time they move between anchors, there is a period of exposure.

Horizontal lifeline systems installed under AS/NZS 1891.2 allow a worker to remain continuously connected while travelling the full length of the system. The traveller slides along the cable or rail, and the worker never disconnects. For roofs with multiple plant items spread across a large area, or where workers need to carry tools and equipment while moving, this is a material safety improvement.

Horizontal lifelines require more engineering input at the design stage. The system must be designed by a competent person who accounts for the span lengths, anchor load capacity, intermediate post spacing, and the fall clearance below the system. A poorly designed static line can generate anchor loads exceeding 30kN in a mid-span fall scenario, well beyond what a standard single-point anchor can absorb. This is why Part 2 installations require engineering documentation and cannot simply be inferred from Part 1 equipment ratings.

The cost difference between the two system types is real but should be assessed against the frequency of roof access and the number of workers involved. A building with monthly HVAC maintenance and two workers on the roof at a time will see a different cost-benefit calculation than a building with annual access for a single technician.

Obligations for Building Owners Under the WHS Framework

The WHS Act and Regulations impose a duty on persons conducting a business or undertaking (PCBUs) to manage risks to health and safety. Building owners who engage contractors to work on their roofs are PCBUs for the purposes of that work.

This means you cannot simply hand a contractor a key to the roof and consider your obligations discharged. You must, so far as is reasonably practicable, provide a safe system of work. That includes ensuring the anchor systems on your building are certified, current, and appropriate for the tasks being performed.

Under AS/NZS 1891.4:2025, the inspection interval for anchor systems is generally 12 months, though some installations in harsh environments (coastal, industrial) warrant more frequent inspection. The certification records must be available on request from a WHS inspector. Failure to produce them is not merely an administrative inconvenience; it is evidence that the duty of care has not been met.

Strata committees managing multi-storey residential buildings face the same obligations as commercial building owners when contractors access roofs for maintenance, window cleaning, or plant servicing. The fact that the building is residential does not create an exemption.

What a Compliance Audit Covers

A height safety audit conducted against AS/NZS 1891.1-4:2025 will assess the installed anchor systems against AS 5532, review the currency of certifications, check that the systems installed are appropriate for the access tasks being performed, and identify any gaps in documentation.

Audits also assess whether the fall clearance below each anchor is sufficient for the equipment in use. An anchor installed on a low-parapet roof may not provide adequate clearance for a standard 1.8-metre lanyard with energy absorber. This is a common finding that requires either a system redesign or a change in the equipment specified for use at that location.

Height Safety Sydney conducts compliance audits across commercial and industrial buildings in Sydney and greater NSW, working to AS/NZS 1891.1-4:2025 and AS 5532:2025. If you are unsure whether your building's height safety systems are current, or if you have recently acquired a building and have no certification records, an audit is the appropriate starting point.

More information is available at [https://sydney.height-safety.au](https://sydney.height-safety.au).