Evacuation Diagrams for Auto Repair Shops in Australia

Auto repair shops, mechanical workshops, and vehicle service centres are among the most hazardous small business environments in Australia. Flammable fuels and solvents, vehicle hoists, inspection pits, welding equipment, LPG systems, and battery charging stations all create fire and injury risks that must be addressed in the facility's emergency plan.

Under AS 3745:2010, Planning for Emergencies in Facilities, every auto repair shop must have an Emergency Management Plan and compliant evacuation diagrams. Despite this requirement, compliance in the automotive repair sector is notoriously low. Many workshop owners assume that because their premises is "just a shed" or a small operation, the rules do not apply. They do. A fire in an auto repair shop can escalate to a major incident within minutes due to the volume of flammable materials present.

Key Hazards in Auto Repair Workshops

The primary fire hazard in an auto repair shop is the volume and variety of flammable liquids stored and used on site. Petrol, diesel, engine oil, transmission fluid, brake cleaner, degreaser, acetone, and paint thinner are all commonly present. Many of these are Class 3 flammable liquids under the Australian Dangerous Goods Code. A spill of petrol on a workshop floor, combined with a spark from a grinder or welder, is a well-documented ignition scenario.

LPG-powered vehicles and LPG cylinder storage add another dimension of risk. LPG is heavier than air and can accumulate in inspection pits and low-lying areas, creating an invisible explosion hazard. Workshops that service LPG vehicles must have specific ventilation and safety measures, and the evacuation diagram should identify LPG storage and handling zones.

Battery charging stations produce hydrogen gas, which is lighter than air and highly flammable. While the volume produced is small, inadequate ventilation in an enclosed charging area can allow hydrogen to reach explosive concentrations. The location of battery charging areas should be shown on the evacuation diagram.

• Flammable liquids: petrol, diesel, solvents, brake cleaner, paint thinner
• LPG: heavier than air, accumulates in pits and low areas
• Welding and grinding: spark and hot work ignition sources
• Battery charging: hydrogen gas production in enclosed areas
• Inspection pits: confined space and vapour accumulation hazard
• Vehicle hoists: mechanical hazard and potential egress obstruction

Inspection Pits and Confined Spaces

Inspection pits are a confined space under AS 2865 (Confined Spaces). They present two distinct hazards during an emergency: they can accumulate heavier-than-air vapours (petrol, LPG, solvent fumes) to dangerous or explosive concentrations, and a worker inside a pit during an evacuation must climb out before they can exit the building.

The evacuation diagram must show the location of every inspection pit and should include a notation that pits are confined spaces. The egress route from the pit area to the nearest exit should be clearly indicated. Workers who regularly use inspection pits should be trained in confined space emergency procedures as part of the broader Emergency Management Plan.

If the workshop has below-ground waste oil tanks or drainage sumps, these should also be identified on the diagram as potential hazard zones. A fire involving waste oil in a below-ground tank can produce toxic smoke and be extremely difficult to control.

Vehicle Positioning and Egress Obstruction

Unlike most workplaces where the floor plan is relatively stable, an auto repair shop's internal layout changes constantly as vehicles move in and out. A car on a hoist, a truck blocking a doorway, or a trailer parked across an exit route can all obstruct evacuation paths.

The evacuation diagram should show the designated work bays, the primary vehicle entry and exit points, and all pedestrian exits. The Emergency Management Plan should include a rule that pedestrian exits must never be blocked by vehicles, equipment, or materials. Workshop managers should conduct regular checks to ensure that evacuation routes remain clear.

For workshops with roller doors as the primary means of access, the diagram should note whether the roller doors can be opened manually during a power failure. If they cannot, the diagram must show alternative pedestrian exits that are independent of powered doors. Relying solely on an electric roller door for emergency egress is a serious safety deficiency.

Hot Work, Spray Painting, and Specialist Zones

Workshops that perform welding, spray painting, or panel beating have additional hazards that must be reflected in the evacuation diagram. Welding produces sparks, molten metal, and UV radiation. Spray painting involves flammable solvents in an enclosed booth. Panel beating may use chemical fillers and resins that produce toxic fumes.

Spray painting booths are required to comply with AS/NZS 4114 (Spray Painting Booths) and must have dedicated ventilation and fire suppression systems. The evacuation diagram should show the location of the spray booth, the fire suppression system activation point, and the egress route from the booth area.

Hot work areas should be clearly identified on the diagram. If the workshop issues hot work permits for welding or cutting in non-designated areas, the Emergency Management Plan should address the additional fire watch requirements, although this level of detail is typically in the EMP rather than on the diagram itself.

Customer Waiting Areas

Many auto repair shops have a small customer waiting area, sometimes just a few chairs near the reception counter. Customers in this area are not trained workers and may not understand the hazards present in the workshop. The evacuation diagram posted in the waiting area should be oriented for a first-time visitor and should show a clear, direct route to the nearest exit and the assembly area.

The diagram should not require customers to pass through the workshop to reach an exit. If the only available exit requires passing through the work area, this is a building layout issue that should be addressed with the building owner or through a fire engineering assessment. At minimum, the diagram must show the reality of the available exits, even if the layout is not ideal.

Fire doors or barriers between the workshop and customer areas are required under the National Construction Code for most workshop configurations. The evacuation diagram should show these barriers and any fire doors, including whether the doors are self-closing or held open on magnetic releases.

Get Evacuation Diagrams for Your Auto Repair Shop

EvacPath creates AS 3745-compliant evacuation diagrams for auto repair shops, mechanical workshops, tyre shops, panel beaters, and vehicle service centres across Australia. We understand workshop layouts, vehicle bay configurations, and the specific hazards of the automotive repair industry.

Send us your floor plan and we will deliver print-ready PDFs in 3 to 5 business days. No site visit required. Pricing starts at A$70 per diagram. Basic Package A$280 for up to 4 diagrams, Standard Package A$420 for up to 8 diagrams.