AS/NZS 1891 Explained: A Building Owner's Guide to Height Safety Compliance

AS/NZS 1891 is the Australian and New Zealand standard that governs personal equipment used for work at height. It covers everything from the harness a worker buckles on to the anchor point that harness connects to. For building owners, facilities managers, and strata committees, understanding this standard is not optional. Under the Work Health and Safety Act, a person conducting a business or undertaking (PCBU) has a duty to provide and maintain safe systems of work. That duty extends to the physical infrastructure on your building.

The 2025 revision of AS/NZS 1891 updated testing requirements, load ratings, and documentation obligations across all four parts. If your building's height safety systems were installed or last certified before 2025, a compliance review is worth scheduling.

The Four Parts of AS/NZS 1891

The standard is split into four distinct parts, each addressing a different category of fall protection equipment. They are designed to work together as a system, but each part carries its own technical requirements.

Part 1: Industrial Fall-Arrest Systems and Devices

AS/NZS 1891.1 covers the equipment a worker wears or carries: full-body harnesses, fall-arrest devices, energy absorbers, and lanyards. It sets minimum performance requirements for how this equipment must behave under load, including the forces transmitted to the body during a fall arrest event.

For building owners, Part 1 is relevant because it defines what equipment contractors are permitted to use on your site. If a contractor arrives with harnesses that do not meet AS/NZS 1891.1:2025, work should not proceed. Your duty of care as a PCBU includes ensuring that workers on your premises are using compliant equipment, even if those workers are employed by a third party.

Part 1 also sets inspection and retirement requirements. Harnesses must be inspected before each use and formally inspected at least every six months by a competent person. Equipment that has arrested a fall must be withdrawn from service immediately, regardless of visible condition.

Part 2: Horizontal Lifeline Systems

AS/NZS 1891.2 covers static line systems: the cable or rail installations that run horizontally across a roof or structure, allowing workers to move continuously without disconnecting from fall protection. These systems are also called horizontal lifelines or traveller systems.

This part specifies design loads, anchor spacing, deflection limits, and the engineering sign-off requirements for installed systems. A horizontal lifeline system must be designed by a competent person, which in practice means a structural or mechanical engineer with relevant height safety experience. The design must account for the number of simultaneous users, the geometry of the roof, and the anchor substrate.

Part 2 is where building owners often have the most direct obligation. If your building has a static line system, it must be installed to AS/NZS 1891.2 and recertified at intervals specified by the manufacturer and the standard. A system that has never been formally certified, or that was installed without engineering documentation, is non-compliant regardless of how long it has been in place.

Part 3: Fall-Arrest Devices Associated with a Rigid Anchorage Line

AS/NZS 1891.3 addresses vertical lifeline systems, specifically the devices used on fixed vertical rails or cables, such as those found on fixed ladders or vertical access routes. The standard covers the fall-arrest devices that travel with the worker as they climb.

For most commercial buildings, Part 3 is relevant where there are fixed ladder systems with integrated fall protection. If your building has a ladder to the roof or plant room that includes a central rail or cable, the fall-arrest device attached to that system must comply with Part 3.

Part 4: Selection, Use, and Maintenance

AS/NZS 1891.4 is the part most directly relevant to building owners and facilities managers because it governs how fall protection systems are selected, used, and maintained in practice. It does not cover equipment manufacture; it covers operational obligations.

Part 4 requires that:

• A fall protection system is selected based on a documented risk assessment
• Workers are trained in the use of the equipment before they use it
• Equipment is inspected, maintained, and records are kept
• Rescue procedures are in place before work at height begins

The rescue planning requirement is frequently overlooked. If a worker is suspended in a harness after a fall, they must be recovered quickly. Suspension trauma can cause serious injury or death within minutes. Part 4 requires that a rescue plan exists and that someone on site is capable of executing it.

Single-Point Anchors vs Horizontal Lifeline Systems

Building owners regularly ask which system their building needs. The answer depends on the access requirements, the roof geometry, and the tasks being performed. The two primary options are single-point anchors governed by AS 5532:2025 and horizontal lifeline systems governed by AS/NZS 1891.2.

Single-Point Anchors (AS 5532:2025)

AS 5532:2025 is a separate standard from AS/NZS 1891, but the two work together. AS 5532 covers the manufacture and testing of single-point anchor devices: the individual anchor points installed into a roof structure that a worker clips their lanyard to.

A single-point anchor must be rated to a minimum of 15kN for a single user. Some installations require 21kN ratings depending on the anchor type and substrate. The anchor must be installed into a structure capable of sustaining those loads, which means the substrate, whether concrete, steel, or timber, must be assessed before installation.

Single-point anchors work well where roof access is infrequent, the work area is defined and limited, and only one or two workers need access at a time. A building with a single rooftop HVAC unit that requires quarterly maintenance is a reasonable candidate for a single-point anchor system.

The limitation is that workers must disconnect and reconnect each time they move between anchor points. On a large roof with multiple work areas, this creates both a practical inconvenience and a safety gap during the transition.

Horizontal Lifeline Systems (AS/NZS 1891.2)

A horizontal lifeline system eliminates the need to disconnect during movement. The worker connects to a traveller that slides along the cable or rail, maintaining continuous fall protection across the full length of the system.

These systems are suited to roofs where workers need to travel along a defined path, such as the perimeter of a building, or where multiple trades require access to different areas in a single visit. They are also the appropriate choice where work frequency is high, such as buildings with rooftop plant rooms serviced weekly.

The trade-off is cost and engineering complexity. A horizontal lifeline system requires a structural engineer's design, specific anchor spacing, and a cable tensioning system that must be checked at each recertification. The installation cost is higher than a single-point anchor arrangement, and the ongoing certification requirements are more involved.

What Building Owners Are Responsible For

The WHS Act places the primary duty on the PCBU, and building owners are PCBUs in relation to their premises. That means the obligation to provide compliant height safety infrastructure sits with you, not with the contractors who access your roof.

In practical terms, this means:

• System installation: : Any anchor points, static lines, or edge protection on your building must be installed by a licensed installer to the relevant Australian standard.
• Certification documentation: : You must hold current certification records for all installed systems. These records should include the installer's details, the standard the system was installed to, the load ratings, and the date of the next required inspection.
• Recertification intervals: : Most anchor systems require recertification every 12 months. Horizontal lifeline systems may require more frequent inspection depending on usage and manufacturer requirements. The 2025 revision of AS/NZS 1891 tightened documentation requirements, so older certification records may not meet current obligations.
• Contractor management: : Before allowing any contractor to work at height on your building, confirm that they are using compliant equipment and that they have a rescue plan. A simple contractor induction checklist covering these points provides a documented record of your due diligence.

Strata committees carry the same obligations for common property. If the building has a shared roof that is accessed for maintenance, the owners corporation is the PCBU for that access and must ensure compliant systems are in place.

When to Commission a Height Safety Audit

A height safety audit is the most direct way to establish whether your building's systems meet current requirements. An audit should assess every anchor point, static line, access ladder, and edge protection element against the applicable standard, and produce a written report identifying any gaps.

An audit is worth commissioning if:

• Your building has not had a formal height safety review in the past 12 months
• You have recently purchased or taken over management of a building
• Roof access requirements have changed, for example, rooftop solar has been added
• You have received a contractor complaint or incident report relating to roof access
• Your existing certification documentation does not reference the 2025 standards

Height Safety Sydney conducts compliance audits against AS/NZS 1891.1-4:2025 and AS 5532:2025 for commercial and industrial buildings across Sydney and greater NSW. If you are unsure whether your building's systems are current, visit [https://sydney.height-safety.au](https://sydney.height-safety.au) to discuss an audit.