Pictured above: a boltless shelving installation with a long, clear aisle down the centre — the kind of unobstructed access an approved warehouse layout, whatever it was approved for, has to keep on the floor as well as on paper.

A racking layout usually starts with pallet positions and load class. One sentence changes what the layout drawing has to do: "we're a licensed warehouse" or "this unit is on the Zero-GST scheme." If your operation holds a Licensed Warehouse or Zero-GST Warehouse (ZG) licence from Singapore Customs, the racking layout is not only a construction decision — it sits inside a plan Customs has already approved, and changing it is not always as simple as calling in an installer.

What the licence actually covers

Singapore Customs runs two related schemes for companies storing dutiable goods, or goods on which GST has not yet been paid, without clearing duty or GST on the way in: the Licensed Warehouse Scheme and the Zero-GST Warehouse Scheme. Neither is a general storage permit. An applicant has to show a proper storage facility with security measures in place, and submit a layout plan of the intended licensed area as part of the application — marking the entry and exit points and the security features on site, such as CCTV and alarms. That layout plan is what Customs approves. In most warehouses, it is also the same drawing the racking gets built against.

The two schemes are aimed at different things. A Licensed Warehouse holds goods on which customs duty has not yet been paid — the categories that attract duty in Singapore are a short, fixed list: liquor, tobacco, motor vehicles and petroleum or biodiesel products. A Zero-GST Warehouse holds goods on which import GST has not yet been paid, which covers a much wider range of general merchandise, and is the more common of the two for ordinary logistics and distribution operators. Either way, the goods inside are treated by Customs as if they had not yet entered Singapore for duty and tax purposes, which is exactly why the physical storage arrangement matters as much as the paperwork.

The rule that catches people out

What trips people up is not the racking itself — it is what counts as a change to the licensed premises. Singapore Customs' own published condition is that prior approval is required for any structural alteration to the licensed premises. That wording does not carve out an exception for a racking reconfiguration. Knock down a partition wall, and most operators already know to ask first. Add a run of bays, convert a section from selective to double-deep, or extend racking into floor area that was left clear on the approved plan, and the same condition applies — because it changes the layout Customs signed off on, not because it changes a wall.

In practice this reverses the usual order of work. On an unlicensed floor, you survey, design and install, then update your own records afterwards. On a licensed or Zero-GST floor, the layout change needs to be squared with your compliance contact — and, where required, with Customs — before the racking contract is signed, not reported afterwards as something already done. Tell your installer the unit is licensed at the first conversation, before a site survey is even booked. It changes the order of operations, not just the paperwork.

Segregation has to be physical, not a SKU code

Both schemes exist to keep Zero-GST or dutiable stock separate from goods that have already cleared duty and GST, and the published condition is stated as a physical one: clear separation between the licensed storage area and regular storage, so the two can never commingle. A shared aisle with two SKU ranges on either side, told apart only by a location code in the WMS, does not meet that bar on its own. What does is a layout that puts the licensed stock in its own clearly addressed aisle or zone — a real physical line on the racking, not a database filter — so a stock check can walk the boundary and see it, not just query it.

That has to be decided at design stage, because splitting an existing run into a licensed zone and a regular zone after the racking is already up usually means relocating bays, not just repainting a floor line. It is the same underlying problem as splitting part of a warehouse between two operations — except here the two "tenants" sharing one floor are two different compliance regimes inside the same company.

The layout plan already commits you on security, not just steel

Because the application asks for entry and exit points and the security features around them, the approved plan is also a statement about how people and goods move through the space. A racking run that ends up narrowing an aisle a camera was meant to cover, or closing off one of the entry points named on the licence layout, is a mismatch with what is on file with Customs — on top of whatever fire-code problem it might also create. The main entrance, any secondary exit, and the dock doors named on the licence layout are worth walking with a tape measure before racking positions are fixed, not after the frames are bolted down.

Design for a stock count a person can actually walk

Licensees have to give Singapore Customs access — manpower and system access — for periodic audits, stock checks and investigations on request. That is a physical event: someone walks the floor, checks bin locations against the stock record, and needs to physically reach every location to do it. A layout designed purely for forklift throughput, with aisle widths sized to truck clearance and nothing more, can turn that walk-through into something slower and more disruptive than it needs to be. Keeping the paperwork a stock check will actually ask for is half of this; giving the person doing the check a walkable, clearly addressed aisle is the other half, and both are decided at the same layout stage as the pallet positions — not added afterwards.

When to actually check

There are three natural points to check. The first is at the licence application itself, when the layout plan is drawn from scratch and the racking should be designed to it, not fitted around it afterwards. The second is licence renewal, which is a natural point to walk the floor against the plan on file and flag any racking that was added, moved or removed since the last approval — before Customs does. The third, and the one that catches people out most often, is an operational change that has nothing to do with Customs on the surface: a new 3PL client needs more pallet positions, an SKU mix shifts and a section converts from selective to double-deep, or a warehouse manager simply wants tighter aisles for a new fleet of reach trucks. Any of those can touch the licensed area without anyone stopping to ask whether it should.

Who does what

None of this makes a racking contractor responsible for the Customs paperwork — that stays with your own compliance team, and it should. What changes is what we need to know before drawing the layout: that the unit, or a section of it, is licensed or on the Zero-GST scheme; whether segregation from ordinary stock is required; and whether a layout plan is already on file with Customs that the new design has to match or formally amend. Told at the survey stage, this becomes one more input into a pallet racking design alongside floor loading, forklift type and pallet positions. Found out after installation, it is a rework — on your racking and, potentially, on your licence conditions.

If your unit holds a Licensed Warehouse or Zero-GST licence and you are planning a racking change, tell us that at the first conversation, before the layout is drawn: WhatsApp us on 9107 2601, or see the full range on our pallet racking systems page and services.

Related reading: racking location labels and warehouse addressing · the racking paperwork worth keeping · subletting part of your warehouse