Permit to Work Template — When You Need More Than a SWMS

A permit to work is a site-level authorisation system that controls when and how specific high-risk activities may proceed. The system originates from the process industry — oil refineries, petrochemical plants, power stations, and mining operations — where simultaneous operations create hazards that cannot be managed by individual subcontractor planning alone. The permit imposes a gate between the plan and the execution, ensuring that site conditions are verified, adjacent work is coordinated, and emergency arrangements are in place before work commences.

The person who issues the permit is typically the site supervisor, the principal contractor's WHS representative, or a designated permit authority. The person who receives the permit is the crew leader performing the work. Both parties sign the permit, and the permit is physically displayed at the work location for the duration of the activity. When the work is complete, the permit is formally closed out, which includes any post-work checks such as fire watch for hot work or headcount confirmation for confined space entry.

Unlike a SWMS, a permit to work is not legally required under the model WHS laws or the Victorian OHS Act 2004. It is a management control chosen by the principal contractor or site operator to coordinate hazardous work. However, once imposed, the permit becomes part of the site rules, and failure to comply with the permit system is a breach of the contract under which the subcontractor is performing work on site. In regulated industries — major hazard facilities under WHS Regulation 2025 Part 9.4, mining operations under state mining safety laws, offshore petroleum under NOPSEMA — permit-to-work systems are effectively mandatory through the safety case or safety management system requirements.

The most important distinction is this: a SWMS is prepared by the subcontractor based on their trade knowledge and submitted to the principal contractor before work starts. A permit is issued by the principal contractor based on current site conditions verified on the day the work will occur. The SWMS is a plan; the permit is a green light. Both are needed for many high-risk activities, and the two documents reference each other through the permit issue process.

The most common confusion in the field is that workers treat a permit and a SWMS as alternatives to each other, when in fact they address different questions. A SWMS answers the question how will the work be done safely. A permit answers the question is it safe to start this work right now. A site operating without SWMS cannot produce compliant permits because the permit authority has no documented work method to check against. A site operating without permits cannot coordinate simultaneous hazardous activities because the SWMS do not account for adjacent work.

The legal status of the two documents is different. The SWMS is mandated by WHS Regulation 2025 section 299 for any high-risk construction work listed in Schedule 1. Preparing the SWMS is a statutory duty of the PCBU performing the HRCW, and failure to prepare it is a breach of the regulation regardless of whether a permit system is in place. The permit is a site-level administrative control and is enforced through the principal contractor's WHS Management Plan and site inductions, not directly through the regulation.

The preparation sequence is different. The SWMS is prepared before the subcontractor arrives on site, ideally at the tender stage and refined during site mobilisation. It is reviewed by the principal contractor against section 299 content requirements, and it is accepted as a standing document for the duration of the work. The permit is prepared on the day of the work — often at the start of the shift — based on the current state of the site. Weather, adjacent work, atmospheric conditions, and worker availability all affect whether the permit can be issued.

The duration is different. A SWMS covers the full duration of the HRCW activity, which might be a single day for a small scope or several weeks for a major structural task. A permit typically covers a single shift or a specific time window, often expressed as a start time and an end time. When the shift ends, the permit is closed out; when the next shift begins, a new permit is issued even though the SWMS is unchanged.

The scope is different. A SWMS addresses the work activity as a whole — the tasks, the hazards, the controls, the equipment, the training requirements, the emergency arrangements. A permit addresses a specific activity at a specific location at a specific time — hot work in Plant Room 3 between 0600 and 1400, excavation in the trench between grid lines 4 and 8, confined space entry into vessel V-401. The permit is narrow and time-bound; the SWMS is broad and duration-based.

Hot work is any activity that produces sparks, flames, molten material, or sufficient heat to ignite combustible material. The main activities are oxy-cutting, arc welding, MIG welding, TIG welding, grinding, brazing, soldering, thermal lancing, and heat-bonded waterproofing membrane application. Every one of these is a potential ignition source in an environment that often contains combustible dust, flammable vapours, or construction materials with high fire loadings.

Hot work permits are the most widely used permit type in Australian construction. They are standard on every commercial building site, most industrial facilities, and every site with a fire risk assessment. The permit confirms that combustible materials within 11 metres of the hot work have been removed or protected by fire-resistant blankets, that suitable fire extinguishers are positioned within arm's reach of the hot work operator, that a fire watch is assigned for the duration of the work and for at least 30 minutes after the work ceases, that smoke detectors in the affected area are isolated and flagged for re-energisation, and that the site fire panel operator is notified of the isolation.

AS 1674.1-1997 provides guidance on fire safety precautions during hot work and is referenced in most principal contractor permit systems. The standard specifies the 11-metre exclusion zone, the fire watch requirements, and the combustible material removal or protection requirements. The permit typically references the standard directly and requires compliance with the specified controls before the permit can be issued.

Hot work permits become more stringent in specific environments. Work in areas with a flammable atmosphere requires atmospheric testing before the permit is issued and gas monitoring during the work. Work near stored chemicals or fuels requires exclusion zones of up to 30 metres and the presence of firefighting foam rather than water extinguishers. Work on live plant or in operating process areas typically requires isolation of the affected systems and parallel isolation permits. The hot work permit coordinates with these other controls through the permit authority's cross-check at issue.

Confined space entry is one of the 18 HRCW categories under WHS Regulation 2025 Schedule 1, which means it always requires a SWMS. It is also governed by specific requirements under Part 4.3 of the regulation and by AS/NZS 2865-2009 Safe working in a confined space. Because confined space entry carries very high fatality potential — historical Australian data shows confined space deaths are dominated by asphyxiation, toxic gas exposure, and engulfment — the permit system is the last administrative control before entry occurs.

The confined space permit documents atmospheric test results for oxygen (19.5-23.5% acceptable range), flammable gases (less than 5% of the lower explosive limit), and toxic gases (below occupational exposure limits for hydrogen sulphide, carbon monoxide, and any specific contaminants expected from previous contents of the space). The test must be performed immediately before entry and repeated continuously or at frequent intervals during the work, because atmospheric conditions in confined spaces can deteriorate rapidly with no visible warning.

The permit also documents the ventilation arrangements (natural or mechanical), the rescue plan, the rescue equipment on standby, the standby person details, and the communication method between the entrant and the standby person. AS/NZS 2865 requires a trained standby person to remain outside the confined space throughout the entry, continuously monitoring the entrant and capable of initiating rescue. The standby person must not enter the space to perform a rescue unless they are equipped and trained for it — a significant proportion of confined space fatalities historically involve would-be rescuers who entered unprotected and also died.

The permit identifies the specific workers authorised to enter, and re-entry by workers not named on the permit is not permitted. The permit is closed out only when the standby person confirms all entrants have returned, and the headcount at exit must match the headcount at entry. Any discrepancy triggers an immediate rescue response. The SWMS and the permit overlap substantially for confined space work, but the permit adds the day-of verification that the SWMS cannot provide in advance.

Excavation deeper than 1.5 metres is HRCW under Schedule 1 and requires a SWMS. Many principal contractors also impose an excavation permit requirement for any ground disturbance, including shallower work, to control the risks of underground service strikes. The hazards of underground services — buried electrical cables, gas mains, water mains, telecommunication cables, and contaminated soils — are not visible from the surface and cannot be managed by worker vigilance alone.

The excavation permit references the Dial Before You Dig Australia (now Before You Dig Australia, BYDA) plans obtained before the work. The plans show known underground services in the area but do not guarantee completeness or accuracy — services may have been installed without being recorded, recorded services may have shifted, and the plans have a standard tolerance for positional accuracy. The permit authority confirms that BYDA plans have been obtained, that services in the tolerance zone have been visually located by hand excavation or non-destructive digging, and that the excavation route has been marked on the ground.

The permit also addresses collapse control. Excavations deeper than 1.5 metres require shoring, battering, or benching to prevent collapse, with the specific control depending on soil type, water table, adjacent loading, and duration. AS 2187 covers the technical requirements for excavation safety. The permit documents which control has been selected for the specific work and confirms that the required equipment is on site. Excavations that exceed the design basis of the shoring — deeper, wider, or in different soil conditions than assumed — require a fresh engineering assessment before the permit can be issued.

Access and egress requirements are documented on the permit. Every excavation deeper than 1 metre requires a means of egress within 7.5 metres of any worker position, typically a ladder secured to the excavation support. The permit confirms the ladder positions, the protection of the excavation perimeter against falls (for adjacent workers), and the arrangements for removal of spoil to a safe distance from the excavation edge to prevent spoil falling back into the excavation.

Work on or near energised electrical installations is HRCW under Schedule 1 and falls within the scope of AS/NZS 4836-2023 Safe working on or near low-voltage electrical installations and equipment. A SWMS is required, and most principal contractors add an electrical isolation permit to control the lock-out tag-out (LOTO) process. Electrical fatalities in Australian construction are dominated by contact with overhead powerlines and contact with unidentified live conductors during excavation or demolition, so the permit process targets the verification of isolation before contact work commences.

The isolation permit documents the circuits to be isolated, the method of isolation (circuit breaker off, fuses withdrawn, isolating switch open), the application of LOTO locks and tags, and the testing for dead at the point of work. Testing for dead must be performed with a proven voltage tester — proven before the test, tested at the point of work, and proven again after the test to confirm the tester is still functional. Skipping the pre-test and post-test verification is a common cause of electrical fatalities where a faulty tester indicated zero volts on a live circuit.

The permit identifies the person who holds the isolation keys. Each worker performing the isolated work typically applies their own personal lock to the isolation point, which cannot be removed until they confirm they have finished their work and are clear of the circuit. Supervisor override of personal locks is permitted only under specific circumstances documented in the permit system, and unauthorised removal is treated as a serious disciplinary matter.

Work near live installations but without full isolation — for example, installation of new equipment in an energised switchroom, or repair work where full isolation is not practicable — falls under the live-work provisions of AS/NZS 4836. The permit documents the exclusion distances from live conductors, the insulated tools and PPE in use, the second person requirement, and the emergency arrangements. Live work is the highest-risk category of electrical work and is permitted only when full isolation is not reasonably practicable, which is a high bar under the regulation.

Work at height above 2 metres is HRCW under Schedule 1 and requires a SWMS (the model jurisdictions use a 2-metre threshold; Victoria applies its own fall prevention provisions under OHS Regulation 2017 Part 3.3). Many principal contractors add a roof access permit to control the specific hazards of work on roofs, including fragile roof sheets, skylights, roof edges, adjacent plant rooms, and ladder access points.

The roof access permit confirms that edge protection is in place on all exposed roof edges, that fragile roof areas and skylights are identified and barricaded, that ladder access points are secured and tagged, and that weather conditions are within acceptable limits for the work. Wind speed thresholds for roof work are typically 40 km/h for general access and lower for specific activities such as sheet installation or crane lifts. The permit authority checks the current forecast and the measured wind speed before issuing the permit.

Fragile roof management is the most common failure point in roof access permits. Many Australian commercial buildings have roofs that combine structural sheet over the main area with fragile skylights, asbestos cement transitions, or corroded older sections. AS/NZS 1891.4-2009 and the National Code of Practice for the Prevention of Falls in General Construction apply to work on these roofs. The permit identifies the fragile areas in plan view, confirms the physical barricading is in place, and notes any fall-arrest systems rigged for unavoidable traverse of fragile sections.

The SWMS for the roof work references the permit system and specifies that work cannot commence without the daily permit in place. This creates a positive interlock between the subcontractor's SWMS and the site operator's permit system, so a subcontractor cannot start roof work just because their SWMS is current — they must also have the permit for the day. When the permit is suspended (for weather, for example), the work stops until the permit is re-issued.

The practical workflow on a compliant site proceeds through five stages. Stage one is the pre-start preparation: the subcontractor builds the SWMS before arriving on site, submits it to the principal contractor for review, and waits for acceptance. The SWMS describes the work method, the hazards, the controls, and the implementation arrangements. Until the SWMS is accepted, the subcontractor cannot commence HRCW on the site. This is a statutory requirement under WHS Regulation 2025 section 299 and section 309.

Stage two is the daily pre-start meeting. The site supervisor runs through the day's activities, identifies which activities require permits, and confirms that SWMS are in place for all HRCW. The supervisor cross-checks the worker crew against the sign-on records to confirm that all workers on the HRCW have acknowledged the current version of the SWMS. A worker who has not signed on is redirected to the sign-on station before the work commences.

Stage three is the permit issue. For each activity requiring a permit — hot work, confined space, excavation, electrical isolation, roof access — the crew leader requests the permit from the permit authority. The authority checks the SWMS, inspects the work area, verifies the required controls are in place, and issues the permit for a specific time window. The permit is physically posted at the work location and remains visible throughout the activity.

Stage four is the work itself. The SWMS describes the method and the controls; the permit authorises the day. Workers follow the SWMS controls and the additional permit conditions. If conditions change — unexpected services uncovered during excavation, weather deteriorating during roof work, atmospheric readings rising during confined space entry — work stops and the supervisor is notified. The permit may be suspended or cancelled, and the SWMS may need to be amended before work resumes.

Stage five is permit close-out and SWMS handover to the next shift. Hot work permits require a 30-minute fire watch after work ceases, confined space permits require headcount confirmation, electrical isolation permits require removal of LOTO locks only after confirmation of work completion. The SWMS remains active for the next shift unless an amendment is triggered. A new permit is issued at the start of the next shift, checking that overnight conditions have not changed the risk profile. This cycle repeats daily through the duration of the HRCW.