Outgrowing Your Warehouse: The OHS Thresholds Growth Crosses
Your site didn't get bigger. Everything inside it did.
More stock, more forklifts, more chemicals, more people, more shifts. Same four walls. The controls you set up at fit-out were built for the business you were then. Victorian law expects you to check them before each change, not after the first incident.
The black line is what your traffic plan, DG notification and risk assessments were designed for. Growth moves past it one pallet at a time.
Same floor. Different site.
Nobody decides to make a site unsafe. It happens through a hundred reasonable decisions: one more rack run, a second shift, a new chemical line from a customer, overflow stock "just for peak". Each change is small. Together they invalidate the layout the controls were designed around.
Fit-out
DWG-GRW-ATraffic plan drawn. Risk assessments done. DG quantities notified. Everything matches.
Year three
DWG-GRW-BSame paperwork. Narrower aisles, stock in the walkway, more traffic, more chemicals. The documents now describe a site that no longer exists.
The duty doesn't scale down while you scale up
Growth sits under the same legal framework as the day you opened. What changes is how many review triggers you trip without noticing.
OHS Act 2004, ss.20 and 21
Provide and maintain a safe working environment so far as is reasonably practicable. "Maintain" is the growth word: a layout that was safe at fit-out has to stay safe as it changes. Section 21(2) spells it out: safe plant and systems of work, safe handling and storage of plant and substances, a safe workplace, adequate welfare facilities, and the information, instruction, training and supervision people need. Section 20 sets the "so far as is reasonably practicable" standard.
OHS Act 2004, s.35
You must consult affected employees when proposing changes to the workplace, the plant or substances used, or the conduct of the work. If there is an HSR, consultation must involve them.
Occupational Health and Safety Regulations 2017
Specific duties for manual handling, plant (including powered mobile plant around pedestrians) and hazardous substances, each with a requirement to review controls when things change.
Dangerous Goods (Storage and Handling) Regulations 2022
Notification, manifest, placarding and design of new or altered storage. Quantity driven, so stock growth changes your obligations even when nothing else does.
OHS (Psychological Health) Regulations 2025
In force from 1 December 2025. Identify psychosocial hazards, control the risk, and review controls before changes to work, process or systems.
Six lines growth crosses without telling you
None of these come with an alarm. Each one is a point where the law expects you to stop and look again.
Dangerous goods quantities creep up
DG obligations are quantity driven. Once quantities pass the notification threshold in the DG Regulations, WorkSafe must be notified within 3 business days. Already notified? A 20% increase on a quantity in your last notification means notifying again, also within 3 business days. So does new plant for storing or handling those goods.
More forklifts, same floor
Two forklifts and a clear walkway is a different risk profile from five forklifts, narrower aisles and a second shift. The OHS Regulations require you to eliminate the risk of powered mobile plant colliding with pedestrians or other plant, or reduce it so far as is reasonably practicable. The traffic plan that met that duty with two units may not meet it with five.
New plant, moved plant
A second wrapper, a mezzanine conveyor, a compactor moved to make room. Plant risk controls must be reviewed before plant is used for the first time at your workplace, and before any alteration or change of location. Moving it counts.
More handling per person
Higher pick rates, heavier SKUs, cartons stacked higher because the racking is full. The OHS Regulations require review before any change to hazardous manual handling work, including a change in where it's done. Training more people is not the answer to more volume.
Pace, pressure and constant change
Growth is a psychosocial event. The Psychological Health Regulations 2025 list high job demands, low job control, poor support and poor organisational change management as examples of psychosocial hazards. Extra shifts, rising targets and a reshuffle every quarter are exactly that.
More people you didn't hire directly
Labour hire, casual pools and contractors fill the gap during growth. As host, you still control the layout, the plant, the systems of work and the supervision they work under. They usually get the shortest induction, on the busiest days, in the least familiar part of the site.
An inspector walking a growing site isn't looking for a missing document. They hold the traffic plan up against the floor. If the plan shows four runs and there are six, or the walkway on paper has pallets on it in reality, the conversation shifts from "do you have a plan" to "when did you last review it, and what changed since".
A ship never gets bigger when the cargo does
Merchant shipping solved the fixed-space problem a long time ago. Every load is planned against the space, the segregation rules for dangerous cargo and the vessel's limits before it comes aboard. Nothing is loaded "just for now". Most warehouses absorb growth with no equivalent gate.
Planned before it's loaded
- Space is fixed, so every addition is planned against what's already there
- Dangerous cargo is segregated by class before loading, not sorted afterwards
- Limits are calculated for every load, not assumed from last voyage
- Any change to the plan goes through a formal change process with sign-off
- The crew is briefed on the new plan before work starts
Absorbed after it arrives
- Overflow stock goes wherever there's floor, including walkways
- New chemicals land in the existing DG store without a quantity check
- Plans and notifications reflect the day they were written
- Changes are operational decisions with no safety sign-off
- Workers find out about the new layout when they walk into it
The law already asks for a stowage plan. It just calls it reviewing controls before the change.
Build a change gate, not another binder
Five questions, asked before any change to layout, volume, plant, chemicals, shifts or staffing. It takes minutes when it's routine and it is the evidence an inspector asks for.
What is changing?
Name it in operational terms.
Which threshold does it touch?
Run it against the six above.
Who is affected?
Consult before deciding.
What gets updated?
Paper follows the floor.
Record and release
Then the change goes ahead.
A dated note that says "racking extended, traffic plan reviewed, walkway relocated, HSR consulted" carries more weight than a polished procedure that was never applied. Inspectors look for evidence the system ran, not that it exists.
When the change isn't your call
A lot of growth pressure comes from outside: customers, suppliers, landlords, seasons. It explains the change. It doesn't pause the duty.
"It's only for six weeks"
Temporary overflow, extra casuals, longer shifts.
LAW Temporary is still a change. Moving plant, changing where manual handling happens or changing how work is organised all require controls to be reviewed first.
"The client sent a new product line"
New chemicals or heavier units arrive on someone else's timeline.
LAW Check DG quantities against your last WorkSafe notification and the Schedule 2 quantities, and make sure storage is fit for it, before it lands, not after.
"We can't move until next year"
The bigger site is coming, so the current one is tolerated.
LAW s.21 applies to the workplace you have today. A planned move is a good reason to manage interim risk well, not a reason to skip it.
Each threshold has its own page
What growing sites ask
Do I need to redo my traffic management plan if we add forklifts?
You need to review it before the change, and revise it if it no longer controls the risk. The OHS Regulations 2017 require plant risk controls to be reviewed before any change in how plant is used or its systems of work, and require the risk of powered mobile plant colliding with pedestrians or other plant to be eliminated, or reduced so far as is reasonably practicable. More units in the same space usually means the plan needs to change.
At what point do I have to notify WorkSafe about dangerous goods?
Once dangerous goods on site pass the notification threshold in the Dangerous Goods (Storage and Handling) Regulations 2022, WorkSafe must be notified within 3 business days. After that, you notify again within 3 business days if a notified quantity rises by 20% or more, if new plant is brought in for storing or handling those goods, or if the main activities change. A fresh notification is also due every 2 years. Separately, the Schedule 2 quantities decide when you need HAZCHEM placards and a manifest.
Does a temporary overflow area need its own risk assessment?
There is no temporary exception. Moving stock into a new area changes how plant is used and where manual handling happens, and both require controls to be reviewed before the change. If dangerous goods go into the overflow, check the DG requirements for that area too. A short, dated review done before the area is used is enough.
Who is responsible for labour hire workers during peak season?
Both businesses have duties. As host, you control the site layout, plant, systems of work, induction and supervision, and section 21 of the OHS Act 2004 requires those to be safe so far as is reasonably practicable. The labour hire provider has its own duties as their employer. Agree who does what before the first shift, not after.
Can rapid growth create psychosocial hazards under the 2025 regulations?
Yes. The Occupational Health and Safety (Psychological Health) Regulations 2025 give high job demands, low job control, poor support and poor organisational change management as examples of psychosocial hazards. Growth often brings all four. The Regulations require psychosocial risk controls to be reviewed before changes to work that are likely to change those risks.
Do I have to consult workers before rearranging the warehouse?
Yes, so far as is reasonably practicable. Section 35 of the OHS Act 2004 requires consultation when proposing changes to the workplace, the plant or substances used, or the conduct of the work, where those changes may affect health or safety. If there is a health and safety representative, the consultation must involve them. Consulting before the layout is locked in also tends to surface problems the plan missed.
We're moving to a bigger site next year. Do we still need to fix the current one?
Yes. The section 21 duty applies to the workplace you have now. A planned move is useful context for choosing interim controls that are proportionate and practical, but it isn't a reason to leave known risks in place until the lease ends.
