Is a mezzanine a type of racking?

No. A mezzanine is a structural floor built above the existing warehouse floor. What goes on it — shelving, picking zones, office space — is a separate decision made after the floor exists.

Does a mezzanine need engineering sign-off?

Yes — it's a structural build carrying occupied load, not a racking layout, so it needs proper structural engineering assessment for the loads and use it's designed for.

Can I put pallet racking on a mezzanine floor?

Sometimes, if the deck's load rating and access support it, but that has to be planned into the mezzanine's structural design from the start rather than assumed afterward.

Mezzanine storage

A mezzanine doesn't belong on the density-versus-selectivity axis at all — it's not a racking system, it's a second floor built above the first, and the storage or work that happens on it can run any system in this silo again on that new level.

Last updated 2026-08-23

A floor, not a rack

Every other article in this silo describes a way of arranging pallets or shelving on a single floor plate. A mezzanine changes what's available in the first place: it's a freestanding structural deck, usually steel-framed, built partway up a warehouse's clear height to create a second usable floor above the ground level. Once that floor exists, what goes on it is a separate decision — it might carry longspan shelving, carton flow for picking, office space, or light pallet storage if the deck's load rating and access allow it.

That's the honest framing: a mezzanine isn't a racking type competing with selective or drive-in for the same floor. It's a way of getting a second floor's worth of options out of a building's unused clear height, which is why it belongs in this silo as the point of comparison against everything else, not as another point on the same axis.

The situation it suits

A mezzanine earns its cost when a building has clear height going unused above existing racking or a low-density ground-floor activity, and expanding outward or moving to a bigger building isn't realistic. It's a common answer to a specific version of the space problem this whole silo is about: instead of squeezing more pallets into the existing floor plate the way drive-in or narrow aisle racking do, a mezzanine adds floor plate itself.

Genuine unused clear height above existing operations
Expansion or relocation not realistic in the near term
A mix of uses — picking, light storage, office — that benefits from being physically separated from the ground floor

What it costs you

A mezzanine is a structural build, not a racking purchase — footings, columns, decking and stairs or a goods lift, plus whatever fire, egress and building-code requirements apply to an occupied upper level. That's a materially bigger project than adding another row of racking, and it needs proper structural engineering sign-off for the load it's meant to carry, not just a racking supplier's layout drawing. Weigh that cost against other expansion options — a mezzanine is one path among several, not automatically the cheapest.

Its edges sit under a different standard

This is worth being precise about, because it's a common point of confusion: the racking systems elsewhere in this silo are covered by AS 4084, the steel storage racking standard. A mezzanine floor's edge protection — handrails, barriers, the fall-prevention detail around its open sides — falls under AS 1657: 2018, Fixed platforms, walkways, stairways and ladders — Design, construction and installation, a different Standards Australia document covering a different hazard: people and goods falling from height, not racking collapse. The two standards don't overlap, and a mezzanine that's structurally sound under one can still have inadequate edge protection under the other. See mezzanine edge protection for how that's typically handled, and treat the two standards as separate compliance questions rather than one covering the other.

Getting the ground floor right underneath it

Whatever goes under a mezzanine deck still matters — clearance for the forklift fleet working beneath it, exclusion zone marking to keep pedestrians and trucks apart in a now-lower-clearance zone, and honest clear height planning for any racking installed underneath the deck rather than just above it.

Common questions

Is a mezzanine a type of racking?: No. A mezzanine is a structural floor built above the existing warehouse floor. What goes on it — shelving, picking zones, office space — is a separate decision made after the floor exists.
What standard covers mezzanine floors?: Mezzanine edge protection falls under AS 1657: 2018, Fixed platforms, walkways, stairways and ladders — Design, construction and installation, which is a different standard from AS 4084, the one that covers steel pallet racking.
Does a mezzanine need engineering sign-off?: Yes — it's a structural build carrying occupied load, not a racking layout, so it needs proper structural engineering assessment for the loads and use it's designed for.
Can I put pallet racking on a mezzanine floor?: Sometimes, if the deck's load rating and access support it, but that has to be planned into the mezzanine's structural design from the start rather than assumed afterward.

Part of our guide to which racking system suits your stock.