Warehouse Heat and the WHS Duty to Manage It

Why there is no single number

Australian WHS law does not set a maximum workplace temperature in the way some people assume it does. What it sets is a general duty on the business to manage risks to health and safety, and heat is treated as one of those risks, assessed by what the work actually involves, not by a thermometer reading against a fixed legal line.

That absence of a single number is easy to misread as an absence of protection. It is not. It means the duty is broader and more context-dependent than a fixed limit would be, covering the actual work being done, not just the ambient temperature.

What the duty actually covers

Safe Work Australia publishes guidance on managing the risks of working in heat, covering how heat becomes a hazard, ambient temperature combined with humidity, radiant heat off a tin or colorbond roof, physical exertion and reduced airflow, and what a business is expected to do about it. The guidance treats heat the same way as any other WHS risk: identify it, assess it for the specific workplace, and control it, rather than wait for a fixed number to be crossed.

The control categories, broadly

Controls generally fall into a few recognisable categories, though the specific mix depends on the site. Engineering controls change the environment itself, ventilation, fans, shade over hot zones, insulation or reflective roofing that reduces radiant heat load. Administrative controls change how work is scheduled and paced, earlier start times, more frequent breaks, rotating workers out of the hottest zones, rescheduling the most physically demanding tasks.

Hydration and acclimatisation are part of the same picture: workers new to a hot environment, including temporary staff brought on for a busy period, generally need more deliberate management than a permanent team used to the site's conditions. Personal measures, cooling garments, appropriate clothing, sit alongside the other controls rather than replacing them.

• Engineering controls: ventilation, fans, shade, roof insulation or reflective coating
• Administrative controls: earlier starts, rostered breaks, task rotation, rescheduling demanding work to cooler parts of the day
• Hydration and acclimatisation, particularly for new or temporary staff
• Personal measures such as suitable clothing, alongside the controls above, not instead of them

Why the building itself matters

How hot a warehouse gets for a given outside temperature depends heavily on the building itself: roof material, insulation, ventilation and how much of the building's shell specification was actually built with heat load in mind rather than cost alone. A well-specified building needs less active management to stay workable on a hot day than a shed with an uninsulated tin roof and no through-ventilation.

This is also why a fix that works at one site does not automatically transfer to another. A warehouse with high clear-height and good roof ventilation carries heat very differently to a low-ceiling shed with the same floor area, and the right mix of controls has to be assessed against the actual building, not assumed from a general rule. The reverse problem, keeping a cold store cold, is a different operational challenge covered separately in what actually drives a cold store's running cost.

What to actually push for

Workers who think their workplace is unreasonably hot have a legitimate basis to raise it, not as a personal complaint, but as a WHS hazard the business has a duty to manage. Asking for the specific controls above, better airflow, adjusted rostering during heatwaves, more frequent breaks, is a reasonable escalation, and it is the kind of request regulator guidance treats as exactly what the duty is there for.

It is also worth remembering this sits alongside the broader question of how a workforce is actually managed, because heat-affected staff working through it rather than being properly supported does not just carry a safety risk, it costs the operation in slower, more error-prone work as well. Heat-affected workers are also more likely to be involved in a near miss than a rested, hydrated team.

Common questions

Is there a legal maximum temperature for an Australian warehouse?

No single number applies nationally. The obligation is a general WHS duty to manage heat as a hazard, assessed against the actual work and workplace, not a fixed legal threshold.

What can I actually ask my employer for on a very hot day?

Reasonable requests include better ventilation or fans, adjusted start times or breaks, and rotation out of the hottest areas. These fall within the business's WHS duty to manage heat as a risk.

Does a tin-shed warehouse have to be air-conditioned?

Not necessarily. The duty is to manage the risk, which can be met through a combination of controls rather than one specific fix like air conditioning.

Are temporary or casual staff at more risk from heat?

They can be, particularly if they have not acclimatised to the site's conditions. This is part of why heat management needs particular attention during busy periods when temporary staff join the floor.

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