Fall Arrest vs Fall Restraint vs Safety Nets: Which Fall Protection Do You Need?

"Fall protection" gets used as a catch-all, but on a real construction site it covers several very different systems — and choosing the wrong one can leave your crew exposed or your site non-compliant. The three terms that get muddled most often are fall restraint, fall arrest and safety nets. This guide explains what each one actually does, how they compare to scaffolding and edge protection, and how to decide what your job needs.

Fall restraint: stop the worker reaching the edge

A fall restraint system is designed to physically prevent a worker from getting to a position where they could fall. Typically that is a harness and a fixed-length lanyard, anchored so the worker simply cannot reach the unprotected edge. Done properly, restraint means a fall never starts in the first place.

The catch is that restraint depends on every worker wearing the harness, clipping to the right anchor, and using a correctly set lanyard length — every time. It protects one person at a time, and only if they use it exactly as intended.

Fall arrest: stop a fall already in progress

A fall arrest system does not prevent the fall — it stops it safely once it is happening, before the worker hits the ground or a lower level. Personal fall arrest uses a full-body harness, an energy-absorbing lanyard or inertia reel, and a rated anchor point. When someone falls, the system arrests them within a controlled distance.

Fall arrest keeps people working in areas restraint cannot cover, but it brings its own demands: enough clearance below, rated anchors, and a rescue plan for anyone left suspended (suspension trauma is a genuine risk). Like restraint, personal fall arrest is an active, individual control — it only works if each worker is clipped on correctly.

Safety nets: collective fall arrest for the whole crew

Safety nets are a form of fall arrest too — but a collective, passive one. Rigged underneath the work area, they catch anyone (or anything) that falls, across the whole span, without each worker needing to clip on or do anything at all. That single difference is why nets sit higher in WorkSafe's order of preference than personal harness systems.

On roofing, truss, steel and re-roof work, a safety net protects everyone above it at once and leaves hands free to work. The soft-landing design limits the forces on a falling person, and a net rigged correctly to the EN 1263-1 standard catches falls close to the work surface. Installation matters though — a net is only as good as its rigging, which is why it should be fitted by FASET-certified installers. We cover what a compliant install includes in our WorkSafe working-at-height guide.

What about scaffolding and edge protection?

Scaffolding, guardrails and edge protection are fall prevention — collective, passive systems that stop a fall happening rather than catching one. Where they are practical, they are excellent, and they are often used alongside nets.

But scaffolding is not always the right tool. For roof and truss work over a large or awkwardly shaped area, full perimeter scaffold can be slow and costly to erect, and it only protects the edges — not the internal area a worker can fall through. Safety nets cover the whole floor plate underneath, install quickly, and stay out of the way of the work above. For many builds the two are complementary: edge protection around the perimeter, nets underneath the work zone.

Which should you choose?

New Zealand's health-and-safety rules do not let you simply pick your favourite. WorkSafe expects you to work down a hierarchy of controls: first eliminate the need to work at height, then use collective, passive protection that works for everyone without relying on individual action, and only then fall back to active, individual systems like personal fall arrest.

• Can you avoid the height altogether? Prefabricating on the ground is always the first option.
• Can a collective, passive system protect everyone? Scaffolding and edge protection prevent falls; safety nets catch them. Both protect the whole crew without each person having to clip on.
• Only then, individual systems. Fall restraint and personal fall arrest fill the gaps where collective protection is not practical — but they put the responsibility on each worker, every time.

For most residential and commercial framing, roofing and re-roof work across Wellington and the Kapiti Coast, safety nets are the most practical collective system — fast to install, out of the way, and protecting everyone underneath. Price a net for your site online in seconds, or talk to us about your build.