Turn up to a hospital plant room, an operating factory or a big commercial site and you will hit a wall of paperwork before the tools come out: a SWMS for the high-risk work, and a permit before anyone touches anything. Plenty of crews treat the two as the same box ticked twice. They are not – they answer different questions, they are controlled by different people, and on some jobs the law requires both. Here is how they differ, when each applies, and how to run them together without the morning disappearing into forms.
A SWMS sets out how a high-risk task will be done safely – the method. A permit to work controls whether and when the work may start, in a specific place and time window, after the preconditions have been checked – the authorisation.
| SWMS | Permit to Work | |
|---|---|---|
| Purpose | The method – hazards and controls for doing the task safely | The authorisation – permission to start, once preconditions are verified |
| Who prepares / authorises | The PCBU doing the work, in consultation with its workers | Issued by the site’s permit issuer to the crew’s permit receiver |
| Legal status | Legally required before high risk construction work | Legally required for confined space entry; otherwise usually a site or client requirement |
| Time period covered | The activity, for as long as it runs (reviewed when things change) | A defined window – often a single shift – at a specific location |
| What triggers it | The task falling within an HRCW category | The type of work or area the site’s permit system covers |
| How it ends | Work completes; document retained | Closed out and handed back when work finishes or the window expires |
Under regulation 299 of the model WHS Regulations, a SWMS must be prepared before high risk construction work starts. It identifies the HRCW involved, the hazards, and the control measures – and the work must then be done in accordance with it. It travels with the activity rather than with a date: the same SWMS covers the task for as long as the task runs, provided nothing changes that triggers a review. For a refresher on which activities are HRCW, see our guide to the 19 HRCW categories – and if you are weighing the SWMS against other paperwork, our SWMS vs JSA vs SOP guide covers that ground.
A permit to work is a written authorisation for a specific task, at a specific location, for a defined validity period. It runs between two named roles: the permit issuer – the person controlling the area or the plant, often the principal contractor’s or facility owner’s representative – and the permit receiver, the person leading the crew doing the work.
The permit’s value is in its preconditions. Before the issuer signs, the listed conditions are physically checked, not assumed: isolations locked out, atmosphere tested, fire watch in place, barricades up, other trades in the area notified. When the work finishes – or the shift ends – the permit is closed out and the area handed back, so the site always knows what is live and what is not. If your crew needs to produce its own permit paperwork, you can build a permit to work alongside your SWMS.
This is the one case where both documents are legal requirements. Work carried out in or near a confined space is one of the HRCW categories defined in r.291 of the model WHS Regulations, so a SWMS must be prepared under r.299 – and under r.67, a PCBU must not direct or allow a worker to enter a confined space to carry out work unless a confined space entry permit has been issued for the work, completed in writing by a competent person. No site rule is needed to make either document mandatory here.
Welding or cutting in a live factory, shopping centre or hospital: a SWMS applies if the work involves an HRCW category, and the hot work permit is almost always required too – as a site or client requirement, not by name in WHS law. The permit is how the facility controls ignition sources, fire watch and alarm isolations in a building full of people.
Working on switchboards, pressurised lines or machinery that must be de-energised first usually runs under an isolation permit – again a site or client requirement – so that one authority controls what is locked out, tagged and verified before and after the work.
Many clients and principal contractors require a dig permit before ground is broken near their underground services. That is a site or client requirement layered on top of whatever SWMS the excavation work itself demands.
On a well-run job the sequence is consistent. The SWMS is prepared in consultation with the workers doing the task. The crew is briefed on it – a toolbox talk is the natural place. Then the preconditions are physically checked and the permit is issued, referencing the SWMS title and version so the two documents point at each other. Work proceeds under both: the SWMS governing the method, the permit governing the window. When the work finishes or the shift ends, the permit is closed out and the area handed back. And if checking the permit conditions reveals a changed risk – an isolation that cannot be achieved, an atmosphere that will not clear – that is a trigger to review the SWMS before anyone proceeds, not a detail to note down later.
Is a permit to work a legal requirement in Australia?
For confined space entry, yes – under r.67 of the model WHS Regulations a worker must
not be directed or allowed to enter a confined space to carry out work without a written
entry permit issued by a competent person. Outside confined spaces, permits to work are not
required by name in Australian WHS laws; hot work, isolation, dig and roof access permits
are requirements set by principal contractors, facility owners and clients.
Can a permit to work replace a SWMS?
No. If the work is high risk construction work, a SWMS must be prepared before it starts
– that duty does not go away because a permit was issued. The two do different jobs:
the SWMS is the method, the permit is the authorisation.
Who can issue a permit to work?
That is set by the site’s permit system: normally a nominated, trained permit issuer
who controls the area or plant. For a confined space entry permit specifically, the model
WHS Regulations require it to be completed in writing by a competent person.
How long is a permit to work valid for?
Whatever the permit says, and no longer – validity is set by the site’s permit
system and is commonly limited to a single shift. If the work runs over, the permit is
closed out and a new one issued, with the preconditions checked again.
The crews that lose the least time to permits are the ones whose documents are ready the day before: SWMS current and signed, permit form filled in up to the issuer’s signature, preconditions listed and assigned.
Generate a task-specific permit to work to sit alongside your SWMS, and walk into the pre-start with both documents pointing at each other instead of chasing forms while the crew waits.
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