Quick answer: A permit to work system is a formal authorisation process for dangerous tasks. It makes sure the hazards are checked, the controls are in place, and the work is only done by the right people at the right time.
Last reviewed: March 2026 by the BlueSafe Technical Team. Reflects current Australian WHS laws and regulations.
Permit systems are often used where the hazard is not just part of the task, but part of the conditions at the time of the task. That is why the same job can be safe one day and dangerous the next if the location, atmosphere, plant, or isolations change.
The permit does not replace supervision or training. It gives the work a formal checkpoint so that someone has to stop, check, and authorise before the task begins.
What is a permit to work system?
A permit to work system is a controlled sign-off process used for tasks with a high potential for serious injury. It is a way of making sure the job has been planned, the hazards have been checked, and the control measures are ready before anyone starts.
In a good permit system, the permit is not just a signature. It is a communication tool between the person planning the work, the people doing the work, and the person authorising it.
Typical permit systems cover tasks such as:
- Confined space entry.
- Hot work.
- Electrical isolation and lockout.
- Excavation or trench work.
- Complex work at heights.
- Energy isolation tasks in industrial sites.
If you need the broader planning context first, see how to conduct a WHS risk assessment.
When is a permit to work required?
Some permits are required by law, and others are best-practice systems used because the risk is high enough to justify extra control.
| Activity type | Legal requirement or best practice | Why it matters |
|---|---|---|
| Confined space entry | Legal requirement | Entry can expose workers to toxic atmospheres, engulfment, or loss of consciousness |
| Hot work | Best practice in many industries | Sparks, heat, and flame can start fires or damage hidden services |
| Electrical isolation | Best practice and often required by electrical safety rules | Prevents energised work or unexpected start-up |
| Excavation or trenching | Best practice | Ground collapse, buried services, and access hazards are common |
| Work at heights in complex conditions | Best practice | Conditions can change quickly and increase fall risk |
The key issue is not the label. The key issue is whether the permit system gives the site a hard stop before the work begins.
How does a permit to work system work?
A permit system should be simple enough to use but strict enough to prevent shortcuts.
1. Work request or task identification
Someone identifies that the work is high-risk enough to need formal authorisation. This might happen during planning, during a pre-start meeting, or when site conditions change.
2. Hazard assessment
The work is assessed for the hazards that exist right now, not the hazards that might have existed yesterday. The permit should reflect current weather, plant, nearby work, isolations, and any change in the work area.
3. Controls are confirmed
Before the permit is issued, the authorising person checks that the required controls are actually in place.
Examples include:
- Ventilation.
- Isolation and lockout.
- Barriers or exclusion zones.
- Atmospheric testing.
- Rescue arrangements.
- PPE and training.
4. Permit is issued by an authorised person
The permit should only be signed by someone who has authority to do so and understands the task. If the authorising person does not understand the hazards, the permit is just paper.
5. Work is carried out under the permit
Workers should know the permit conditions and keep them visible or available at the work area. If conditions change, the permit should be stopped and reassessed.
6. Permit is closed out
When the work ends, the permit should be signed off as complete, the site should be returned to safe condition, and any isolations or temporary controls should be removed or handed over correctly.
What should a permit form include?
| Field | What to record |
|---|---|
| Task description | What work is being done and why |
| Location | Exact area, plant, or space involved |
| Time period | Start time, duration, and expiry |
| Hazard review | Main hazards present at the time of work |
| Control measures | Ventilation, isolation, barriers, testing, PPE |
| Authorised personnel | Names of the people allowed to work or approve |
| Emergency arrangements | Rescue, first aid, escalation, contact details |
| Sign-off | Issue, acceptance, suspension, and close-out signatures |
A permit form should be readable at a glance. If people have to interpret it, the system is too weak.
Permit to work vs SWMS
A SWMS tells people how to do the work safely. A permit tells people they are allowed to do the work under the current conditions.
That means the two documents usually sit together:
- The SWMS sets out the method and controls.
- The permit confirms the controls are active right now.
- The supervisor checks that the permit conditions match the site.
For confined space work, you will often need a SWMS and a permit together. The specific confined space guidance is covered in confined spaces, and the SWMS structure is explained in how to write a SWMS.
Common failures in permit to work systems
Most permit failures are not technical. They are process failures.
Common issues include:
- Issuing a permit without checking the actual site conditions.
- Using a permit as a rubber stamp.
- Letting the permit expire while work continues.
- Failing to close out the permit after work ends.
- Using verbal permission instead of written authorisation.
- Not reissuing the permit after a change in conditions.
A permit system should stop the task when the conditions are no longer safe. If it never stops work, it is not a real control.
State and territory variations
The information on this page is based on the Model WHS Act and Model WHS Regulations published by Safe Work Australia, adopted with some variations across most jurisdictions.
| Jurisdiction | Regulator | Key notes |
|---|---|---|
| NSW | SafeWork NSW | Follows the model WHS framework with local variations |
| VIC | WorkSafe Victoria | Uses the OHS Act 2004, so some terminology differs |
| QLD | Workplace Health and Safety Queensland | Follows the model WHS framework with local variations |
| SA | SafeWork SA | Follows the model WHS framework with local variations |
| WA | WorkSafe Western Australia | Follows the model WHS framework with local variations |
| TAS | WorkSafe Tasmania | Follows the model WHS framework with local variations |
| ACT | WorkSafe ACT | Follows the model WHS framework with local variations |
| NT | NT WorkSafe | Follows the model WHS framework with local variations |
Always verify current requirements with your state or territory regulator, as local codes of practice and guidance may impose additional obligations.
Related guides
Frequently asked questions
What is a permit to work system?
A permit to work system is a formal safety authorisation process for high-risk work. It forces a deliberate check that the task is planned, the hazards are understood, and the controls are in place before work starts.
When is a permit to work required?
It is required for some tasks, such as confined space entry, and strongly recommended for other dangerous activities such as hot work or electrical isolation. If the work can become lethal quickly when conditions change, a permit system is usually justified.
Is a permit to work the same as a SWMS?
No. A SWMS describes the safe method for the task, while a permit authorises the task under current site conditions. Many high-risk jobs need both documents.
What must a permit to work document include?
A permit should include the task, location, hazards, controls, authorised people, emergency arrangements, and close-out details. It should also show clearly when the permit starts and when it ends.
Get the right documents for your business
A permit system works best when it sits inside a bigger planning process rather than living on its own. If you need documents that support authorisation, isolation, and high-risk work control, the right template set keeps the system consistent.