Permits to Work: The Control That Sits Above the SWMS

The hot works permit is signed at 7:05am. Fire blanket down, extinguisher within reach, combustibles cleared, spotter nominated, permit valid until 3pm.

At 1:40pm a different trade brings four drums of solvent-based sealer into the same area to start on the adjacent wall. Nobody re-reads the permit. It is still pinned to the board, still signed, still technically valid, and it no longer describes the site it was written for.

What is a permit to work?

A permit to work is a formal authorisation process for high-risk work. It forces a deliberate check, before work starts, that the task has been planned, the hazards are understood, the controls are physically in place, and a named person has authorised the work to proceed.[1][4]

The important part is the authorisation. A permit is not a document that describes how work will be done. It is a gate that someone has to open, for a defined scope, in a defined area, for a defined period.

That last element is what the opening scene turns on. Permits are time-bounded and condition-bounded, and the moment the conditions change the authorisation should stop being valid.

Which permits are actually required by law?

This is where most site teams are working from an assumption that is not correct.

Under the model WHS Regulations, a confined space entry permit is mandatory. Regulation 67 requires it before a worker enters a confined space, and there is no discretion.[2]

For hot work, work at heights, excavation and isolation, no regulation mandates a permit at all. Those permits are not legal requirements. They are widely used because a permit is generally the reasonably practicable way to discharge the primary duty of care for that work, which is a different and softer basis.[3]

Getting this right matters in both directions. Teams that believe hot work permits are legally required often run them as a compliance ritual and stop thinking about them. Teams that discover they are not required sometimes conclude they are optional. Both readings miss the point: the duty of care is mandatory, and the permit is how you meet it.

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Only confined space entry is mandated by regulation. Hot work, heights, excavation and isolation permits are how you discharge the duty of care, not a legal instrument.

Model WHS Regulations

Permit to work or SWMS: what is the difference?

They are frequently confused and they do different jobs. A confined space entry is both: it is high risk construction work requiring a SWMS, and it separately requires an entry permit.[2][5]

The short version: the SWMS is the method, the permit is the gate. For what a SWMS is and what goes in one, see our guide to safe work method statements.

Where permit systems fail

Rarely at issue. Almost always after it.

Conditions change and the permit does not. The solvent drums arrive. The scaffold gets modified. The spotter goes to lunch and is not replaced. The permit still says the controls are in place because it recorded a state of the world at 7:05am.

Nobody closes them out. An unclosed permit means nobody confirmed the work stopped safely, the area was made good, the hot work cool-down was observed, or the confined space was cleared of people. A permit board full of open permits at the end of a shift is not a record of work done. It is a record of who stopped filling in the form.

The issuer is whoever is available. Permit authority is meant to sit with someone competent to assess the controls. Where it drifts to whoever is near the site office, the authorisation stops being an assessment.

Paper permits die with the shift. Three months later, when an incident investigation or an insurer asks who authorised hot work in that area on that date, the answer is a photograph of a board, if it exists at all.

That last one connects directly to the record-keeping obligations that follow any serious event, where the documents an inspector asks for are the ones you already had.

15 metres

Distance within which combustible materials must be removed or protected for hot work under AS 1674.1

AS 1674.1 via model Welding Processes Code of Practice

What good looks like

• The permit names the specific area, the time window and the exact scope, not “level 3” and “as required”

• A named, competent issuer authorises it, and that name is recorded rather than assumed

• The controls listed on the permit are physically verified before issue, not ticked from a template

• The permit expires. It does not roll over because the job is not finished

• A change in conditions invalidates it, and the crew knows that is the rule

• Close-out is a step someone has to complete, including hot work cool-down observation and confined space clearance

• Every issued permit is retrievable by date, area and issuer months later, without a photograph of a board

• The permit connects to the worker record so the people on it are known to be inducted and competent for that task

The measure of a permit system is not how many permits you issue. It is whether an expired or invalidated one can still be sitting on a board looking valid.

The Australian context

Permit practice in Australia sits on a mix of instruments, which is part of why it is misunderstood. The confined space requirement is regulation. Hot work practice leans on AS 1674.1, which the model Welding Processes Code of Practice points to and which sets the widely cited 15 metre clearance for combustible materials around hot work.[3]

Codes of practice are admissible in proceedings as evidence of what was known about a hazard and the reasonably practicable means of controlling it. So the absence of a legal requirement for a hot work permit is much less protective than it sounds. If a fire starts and you cannot show how the work was authorised and controlled, the code is what you will be measured against.

For a principal contractor, there is a coordination dimension too. Permits typically cover work by subcontractors, in areas where other subcontractors are also working, which means the permit is as much about who else is affected as about the crew doing the task. That is the wider duty covered in what HSEQ actually means on a construction site.

Where Plexa fits

Plexa issues permits against the project, the area and the responsible subcontractor, with a named issuer and a defined validity window. When the window expires, the permit expires with it rather than continuing to hang on a board.

Because permits sit in the same platform as inductions and site sign-in, the system knows whether the people named on a permit are actually inducted, current and on site. A permit naming a spotter who signed out at midday is a question the system can raise rather than one nobody thinks to ask.

Close-out is a required step with its own record, so an open permit at end of shift is visible rather than invisible. And because every permit is stored against date, area and issuer, producing the hot work authorisation for a specific afternoon three months ago is a filter, not an archaeology project.

Back at that work zone: the solvent drums arriving in the area is the event that should invalidate the permit. In a system where the permit is tied to the area rather than pinned to a post, the crew grinding at 1:40pm find out before the sparks do.

Frequently asked questions

Is a permit to work legally required in Australia? Only for confined space entry, which the model WHS Regulations require before a worker enters a confined space. Hot work, working at heights, excavation and isolation permits are not mandated by regulation; they are the commonly accepted reasonably practicable way to meet the primary duty of care.[2][3]

What is the difference between a SWMS and a permit to work? A SWMS sets out how an activity will be carried out safely across the project. A permit authorises a specific task, in a specific area, for a specific period, after someone has verified the controls are physically in place. A confined space entry needs both.[2]

Do you need a hot work permit in Australia? Not as a legal requirement, but it is standard practice and it is how the duty of care is normally discharged. AS 1674.1 provides the guidance, including removing or protecting combustible materials within 15 metres of the hot work.[3]

How long is a permit to work valid? For the period stated on it, typically a shift or less. It should also become invalid when the conditions it was issued against change, such as new hazards introduced into the area or the removal of a nominated spotter.

Who can issue a permit to work? A nominated permit issuer competent to assess whether the required controls are in place for that work. Permit authority should be defined in advance, not assigned to whoever happens to be available.

Related reading

The method statement that sits underneath the permit is explained in what is a SWMS. The site access and induction records that make a permit enforceable are covered in seven ways construction teams sign in to site. And the broader duty framework sits in what HSEQ actually means on a construction site.

If you want to see permits expiring on their own instead of hanging on a board, book a 30-minute demo with the Plexa team.