Most pallet racking in Singapore goes into a unit somebody else owns. The tenant designs the layout, buys the system, bolts it to the floor and runs the warehouse — and the three things most likely to cost him money later are all sitting in the tenancy agreement he signed before any of that happened.

This is what to check in a leased unit, in the order it will bite you.

1. Floor loading, and why the number in the lease is not the number that matters

Your tenancy agreement or the building's specification will state a floor loading capacity. Almost everyone reads that figure, decides their goods are lighter than it, and moves on. That is where the mistake lives.

A stated floor loading is a distributed load — a load spread evenly across the slab. Racking does not deliver load that way. It collects everything above it into a small number of base plates, and every base plate is a concentrated point load on one patch of slab. Two warehouses storing exactly the same total tonnage can put completely different demands on a floor depending on how many uprights that tonnage is standing on and how the bays are arranged.

So the useful questions are not "is my stock lighter than the limit". They are:

• What is the point load under each base plate, at full design load?
• Is the slab thickness and construction known, or is everyone assuming?
• Where are the joints, and do any upright positions land on or near one?
• On an upper storey or a ramp-up unit, what does the structure allow, not just the slab? Suspended floors behave differently from a ground slab on grade — floor loading in a ramp-up warehouse goes into this properly.

Ask the landlord for the floor loading information and, where it exists, the structural as-built, before the layout is designed. It is a five-minute request at the start and an expensive redesign later.

2. Whether you are allowed to drill the floor at all

Racking is anchored into the slab. That is not optional — the anchors are part of how the system resists being pushed by a forklift, and a run that is not properly fixed is not the system that was designed.

But drilling into a landlord's floor is an alteration to his property, and leases treat it in wildly different ways. Some are silent. Some require written consent for any fixing. Some prohibit penetration of a waterproofing membrane outright, which matters more than it sounds — on an upper floor or over occupied space below, an anchor through a membrane is a leak waiting for the first wash-down.

Get this answered in writing before installation is scheduled, not on the morning the installers arrive with a hammer drill. If consent is needed, it takes time you have not allowed for, and "we assumed it was fine" is a poor position when the landlord's surveyor is standing on your floor.

3. The reinstatement clause — the one nobody prices

At the end of the lease you will almost certainly have to return the unit to a defined condition. For a racked warehouse that means:

• Dismantling and removing the entire system, which is a real job with a real cost and a real duration, usually at the least convenient moment.
• Making good every anchor hole in the slab. A large installation can be several hundred holes. Individually trivial, collectively a line item.
• Restoring anything else the installation touched — relocated lighting, moved sprinkler heads, floor markings, guard rails, dock arrangements.

There is also a question worth settling early: is the racking yours to take? Tenants assume it obviously is. But a system bolted to the floor can be argued to have become a fixture, and that argument is a bad one to have at lease end, when leverage is at its lowest and everyone is in a hurry. If you intend to remove and re-use the system — which is normally the sensible plan — say so in writing at the outset and make sure the lease reflects it.

If the system is coming with you, plan that properly rather than treating it as a removal job: relocating pallet racking to a new warehouse covers what actually transfers and what does not.

4. The building constraints that decide the design

Two more that are set by the unit, not by you:

Clear height is not roof height. The usable height is to the lowest obstruction along the run — services, lighting, ductwork, structure — and in a sprinklered building it is governed by the required clearance below the sprinkler heads. That clearance determines your top beam level, and therefore how many levels the system has, and therefore the entire economics of the layout. It is settled before design, not discovered during installation. Sprinkler clearance and racking approval is the detail.

The lease term versus the system's life. Racking outlives most leases comfortably. A three-year lease with a design built around this specific unit's column grid can produce a system that fits nowhere else. If there is a realistic chance of moving, that is worth knowing at design stage — standard components and a layout that is not contorted around one building's quirks will move; a bespoke fit will not.

5. If the racking is already there when you take the unit

A surprising number of leased units come with racking left by the outgoing tenant, and it is presented as a benefit. Sometimes it genuinely is. Treat it as an unknown until four questions are answered.

Whose is it now? If the previous tenant abandoned it, the landlord may or may not own it, and you may or may not be inheriting the obligation to remove it at your lease end. That is a reinstatement cost for a system you never bought. Get it in writing.

What is it rated for? Racking has a design load, and that design was made for the previous tenant's pallets, not yours. Without the original load class and configuration, nobody can tell you what may safely be put on it. If there are no load notices fitted to the runs, that alone tells you how the system has been managed.

What condition is it in? Years of forklift traffic leave damage that is easy to miss and not safe to guess at. An inspection before you load anything is the only responsible starting point — and it is far cheaper than discovering the problem with stock on the beams.

Does its layout suit your operation at all? Aisle widths were set by someone else's trucks and someone else's pallet sizes. Inherited racking that forces you to buy different forklifts, or that wastes a third of the floor, is not free.

Inherited racking can be a real saving. It just has to be assessed as a used structural system rather than accepted as furniture.

What to ask for before you sign, or before you design

If you are still negotiating, ask for these. If you have already signed, get them anyway — they determine what can be built:

1. The floor loading capacity and, if available, the slab construction or structural as-built.
2. Written confirmation on anchoring into the floor, including anything about waterproofing membranes.
3. The reinstatement clause, read in full, and written confirmation that the racking remains your property and may be removed.
4. Clear height to the lowest obstruction, and the sprinkler arrangement.
5. The column grid, and the dock and access arrangements — they set the aisle geometry before anything else does.

Nothing on that list is difficult to obtain. What makes it valuable is asking at the point when the answers can still change your decision. That is the same argument as the racking decisions that belong before tenancy — the cheapest time to fix a warehouse layout problem is while it is still a drawing.

The short version

In a leased unit the lease decides more of your racking design than your inventory does. Point loads under base plates, not distributed load, are what the slab actually sees. Confirm in writing that you may anchor into the floor. Read the reinstatement clause and price it, and establish now that the racking is yours to remove. Take clear height from the lowest obstruction and the sprinkler clearance, not from the roof. And if the lease is short, design something that can move.

Working out what fits in a unit you are about to take?

Send us the unit and what the tenancy agreement says, and we will tell you what can be built in it — including where the floor, the height or the clause is the real constraint. Message us on WhatsApp, or see racking systems and our services, including SS EN 15635 inspection.