The first real decision in any Melbourne warehouse racking project isn’t which brand or which supplier — it’s whether direct access to every pallet is worth the floor area that access requires. Selective racking makes every pallet position reachable from an aisle, but those aisles take up space that a higher-density system could otherwise use for storage.
This guide compares selective racking against the four main higher-density alternatives, so you can weigh access against density against your own stock and workflow before requesting a project assessment.
Table of Contents
- The core trade-off: access vs density
- Comparing the five systems
- When direct access should win
- When to prioritise density instead
- What to prepare for a project assessment
The core trade-off: access vs density
Every racking decision comes down to the same underlying question: how much do you need to reach an individual pallet without moving anything else, and how much floor space are you willing to give to the aisles that access requires?
SKU count, pallet quantities per line, and replenishment frequency all shape the answer. A broad product range with frequent, varied picking tends to justify the aisle space selective racking needs. Large quantities of a smaller number of SKUs, picked less selectively, often justify trading some access for meaningfully more storage.
Comparing the five systems
This table is a starting point for comparison — the right system for your site still depends on your actual inventory, handling equipment, and building constraints.
| System | Pallet Access | Relative Density | Key Consideration |
|---|---|---|---|
| Selective | Direct access to each pallet position | Lower than systems reducing aisle space or storing deeper | Suits varied stock and frequent access; needs full aisle width for handling equipment |
| Drive-in | Forklift enters the lane; access within a lane is limited | Higher than selective in suitable layouts | Consider how pallets are grouped per lane and how stock rotation is managed |
| Double-deep | Front positions can restrict access to those behind | Higher than single-deep selective | Needs handling equipment suited to reaching rear positions |
| Narrow-aisle | Individual positions stay accessible | Increases density by reducing aisle width | Aisle dimensions must suit the forklift type and its operating clearances |
| Push-back | Pallets stored several deep; access depends on lane sequence | Higher than selective in suitable layouts | Review pallet quantities per product and how loads are actually retrieved |
When direct access should win
Where a warehouse carries varied SKUs, or staff regularly need to retrieve specific pallet loads without disturbing anything else, selective racking’s direct access tends to earn its floor-space cost. It’s worth remembering that selective isn’t automatically the "safe" or "efficient" default — its value comes entirely from how well it matches your actual stock movement, not from being the most familiar option.
When to prioritise density instead
If the project’s main goal is fitting more pallet positions into a constrained footprint, it’s worth comparing the four higher-density systems properly rather than defaulting to selective out of habit. Work out first how operators will actually access stock, how rotation is managed, and whether your existing handling equipment suits the system you’re considering — density on its own isn’t the only measure that matters.
What to prepare for a project assessment
Whichever system looks like the right fit, a proper assessment needs the same underlying information:
- Document operations — picking and replenishment workflows, stock rotation, and any planned changes
- Measure the site — a dimensioned plan with clear heights, columns, doors, access points, services, and obstructions
- Confirm loads — pallet dimensions, loaded weights, SKU counts, and quantities per line
- Review handling equipment — forklift models, current operating patterns, and any planned changes
- Share it with the project team — final beam levels and component specifications need project-specific design, not a generic layout
Ask the project team to confirm the current relevance and scope of AS4084-2023 for your proposed system, along with applicable WorkSafe Victoria guidance for your site and installation — a general compliance statement won’t necessarily reflect your specific layout and loads.
The right system comes down to how your warehouse actually needs to access and store stock, not which one sounds most efficient on paper. Colby Dandenong supplies all five configurations covered here and provides project-based design, supply, and installation for facilities across Melbourne and Victoria.
Request a project assessment from Colby Dandenong, sharing your site plan, pallet and load details, and handling equipment information.
Frequently Asked Questions
How does selective racking compare with double-deep racking?
Selective gives direct access to every pallet position from an aisle. Double-deep stores pallets two positions deep, so reaching a rear pallet needs the front one moved or handling equipment built for deeper storage — a real density gain, but at the cost of some direct access.
Is narrow-aisle racking the same as selective racking, just with tighter aisles?
Broadly — narrow-aisle retains individual-position access like selective racking, but achieves higher density by reducing the aisle width. The trade-off shifts to equipment: aisle dimensions need to match your forklift type and its specific operating clearances.
When does drive-in racking make more sense than push-back?
Drive-in suits large, uniform quantities of the same SKU where lane-based access is acceptable. Push-back can suit a slightly more varied stock profile since it doesn’t require forklifts to enter the storage structure itself — both need pallet quantities and retrieval patterns reviewed against your actual stock before choosing.
Can I use more than one of these systems in the same warehouse?
Yes — different zones can use different systems where that suits the inventory and material flow in each area, for example selective racking for fast-moving, varied stock alongside a higher-density system for bulk storage. The design needs to account for site constraints and handling routes across all zones together, not each in isolation.
Which Australian Standard applies to steel storage racking?
AS4084-2023, divided into AS4084.1:2023 for design and AS4084.2:2023 for operation and maintenance. Ask your project team to confirm the standard’s current relevance and scope for your specific system, alongside applicable WorkSafe Victoria guidance for your facility.
