Warehouse Racking Acceptance Inspection: 12-Point Checklist & 2026 Tolerances

Warehouse racking acceptance inspection is the step of checking newly installed racking against the approved drawings and the tolerances of EN 15620. Three figures decide it: upright out-of-plumb no more than H/350, upright bow between two beam levels no more than 3 mm, and operating clearances of 75 mm to 150 mm depending on height. If one item is missing, the report must not be signed.

Contents

1. What is a racking acceptance inspection and why can’t it be skipped?
2. What are the permitted installation tolerances?
3. How to measure out-of-plumb and bow on site
4. What is the minimum operating clearance?
5. 12-item acceptance checklist
6. How is a real load test carried out?
7. What should the handover documents include?
8. How to structure a proper acceptance report
9. Six common mistakes during acceptance
10. Frequently asked questions

What is a racking acceptance inspection and why can’t it be skipped?

A warehouse racking acceptance inspection is the process of checking and confirming that newly installed racking matches the drawings, uses the specified materials and is within permitted tolerances before it goes into service. It is not an administrative formality. It is the only moment when you can still require the contractor to fix things at no cost to you.

Compare it with taking handover of an apartment. Before you sign, every wall crack and every misaligned door is the developer’s responsibility. Once you sign, most of those defects become your problem. Racking is the same — except the consequences are far more serious.

An upright installed 40 mm out of plumb over a height of 7 metres still looks straight to the naked eye. But that figure is twice the permitted tolerance, and it creates a permanent horizontal force on the bracing for the entire life of the racking. After a few years plus forklift impacts, that is where failure starts.

The European standard EN 15620 exists to end subjective arguments. It specifies in numbers how much lean is acceptable, how much bow must be corrected and how much clearance is safe. Once the racking is in operation, the next standard is EN 15635 — which governs warehouse racking damage assessment and periodic racking inspections.

What are the permitted installation tolerances?

Permitted installation tolerances depend on the aisle type. Warehouses using counterbalance or reach trucks are Class 400 and may lean up to H/350. Very narrow aisle warehouses using VNA trucks are Class 300 and are allowed only H/500, because the truck runs close to the racking and there is no room for error.

Symbol	Measurement	Class 400	Class 300 (VNA)
Cx	Out-of-plumb of upright frame cross-aisle	± H/350	± H/500
Cz	Out-of-plumb of upright frame down-aisle	± H/350	± H/500
Jx	Upright bow between two beam levels	± 3 mm or ± HB/400	± 3 mm or ± HB/750
Jz	Upright bow down-aisle	± H/500	± H/500
Gy	Straightness thanh beam	± 3 mm or ± A/500	± 3 mm or ± A/500
A	Deviation in clear bay width	± 3 mm	± 3 mm
E	Deviation in aisle width	± 15 mm	± 5 mm

In the table, H is the upright height from the base plate, HB is the distance between two consecutive beam levels, and A is the clear bay width. These values are published consistently by European manufacturers and can be checked in the EN 15620 pallet racking tolerance and clearance tables.

Why are VNA warehouse tolerances tighter?

Because VNA trucks run in aisles only a few dozen millimetres wider than the pallet on each side, usually guided by rails or a floor-embedded wire. The truck cannot steer around obstacles. If an upright leans into the aisle, the forks will hit it at a height of 8–12 metres, where the consequences are worst.

For warehouses using VNA racking, the aisle width tolerance also tightens from ±15 mm to ±5 mm — three times stricter. This is why installing a VNA warehouse costs significantly more than a standard selective warehouse.

How to measure out-of-plumb and bow on site

The minimum tools are a plumb line longer than the upright, a 1,000 mm steel rule and a feeler gauge. A self-levelling laser gives faster and more objective results and should be used when the racking is over 8 metres high or for large projects.

1. Measure upright out-of-plumb. Drop a plumb line from the top of the upright to the floor and measure the horizontal distance between the line and the upright base. Divide the upright height by 350 to get the limit.
2. Choose the right measuring point. Measure at least three uprights per run: at the start, middle and end. Record the largest value in the report, not the average.
3. Measure upright bow. Hold the steel rule along the upright between two beam levels and measure the largest gap between the rule and the steel surface.
4. Measure beam straightness. Stretch a string along the beam before loading and measure the deviation at mid-span.
5. Measure aisle width. Measure at three heights — at floor level, mid-height and at the top — because leaning uprights make the aisle narrower with height.
6. Photograph with the measuring tools. Photos with the ruler or plumb line in frame are objective evidence in case of dispute.

Example limit for a 7-metre upright

A 7,000 mm upright in a Class 400 warehouse may lean at most 7,000 divided by 350, i.e. 20 mm. If the same racking is installed in a VNA warehouse, the limit tightens to 7,000 divided by 500 = 14 mm. A 6 mm difference sounds small, but it is the line between pass and fail.

For upright bow, suppose the distance between two beam levels is 1,800 mm. HB/400 gives 4.5 mm, but the rule says to take the smaller of the two values, so the actual limit remains 3 mm.

What is the minimum operating clearance?

Minimum operating clearance increases with beam level height. At 3,000 mm, 75 mm is enough, but at 13,000 mm you need 100 to 150 mm depending on direction. The reason is practical: the higher the forks are raised, the greater the positioning error.

Beam level height	Horizontal clearance X3/X4	Horizontal clearance X5/X6	Vertical clearance Y3
3,000 mm	75 mm	75 mm	75 mm
6,000 mm	75 mm	100 mm	75 mm
9,000 mm	75 mm	125 mm	75 mm
13,000 mm	100 mm	150 mm	100 mm

The table above is taken from Table 4 of EN 15620 for Class 400 and can be looked up in the EN 15620 standard. The standard allows reduced clearances if the forklift is fitted with a camera to assist viewing at height.

A common design mistake is to cut clearances to the minimum to squeeze in an extra run of racking. A few hundred millimetres saved are traded for many times more impacts over the life of the warehouse. See also warehouse layout design to strike the right balance.

12-item acceptance checklist

A full acceptance inspection of a 1,000 m² warehouse takes about half a working day for two people. The twelve items below cover all common risks, in three groups: documents, geometry and operation.

1. Check against the construction drawings. The number of runs, levels and bay dimensions must match the approved drawings — not the original sales drawings.
2. Steel material certificates. CO/CQ for each batch, and measure the actual thickness with a caliper at at least three random points.
3. Surface coating. Powder coating or galvanising must be even, with no peeling and no rust at welds or cut edges.
4. Upright out-of-plumb. Measure three points per run against the H/350 or H/500 limit.
5. Upright bow. Not exceeding 3 mm or HB/400.
6. Beam straightness. Not exceeding 3 mm or A/500 before loading.
7. Base plate anchor bolts. Correct type and quantity, tightened to the specified torque with a torque wrench — not by feel.
8. Beam safety locks. Must be present in 100% of positions. Count every one — this is the item most often missing.
9. Operating clearance. Measure with a rule and compare with the clearance-by-height table.
10. Real load test. Load one bay to its rated load and measure beam deflection.
11. Load signs. Fitted at the end of each run, showing the configuration actually installed, not the original design configuration.
12. Handover documents. All six documents listed below.

The checklist rule: one failed item means the racking has not passed acceptance. There is no such thing as conditional acceptance for racking, because the warehouse will be loaded as soon as the report is signed and nobody will come back to fix it.

How is a real load test carried out?

The load test confirms that the racking carries the load that was promised. Method: choose a representative bay, load every level to its rated load, hold the load for at least 24 hours, then measure beam deflection and recheck upright plumb.

• Beam deflection under load: must not exceed Span divided by 200. A beam with a 2,700 mm span may deflect up to 13.5 mm.
• Residual deformation after unloading: must not exceed Span divided by 1,000, i.e. 2.7 mm in the same example.
• Upright plumb after the load test: must stay within tolerance and must not increase.
• Base plates and anchor bolts: check again for signs of floor cracking or bolts being pulled up.

If the beam returns almost straight after unloading, the steel is still in its elastic range and the racking passes. If the beam still sags visibly, the steel has deformed plastically on its very first loading — a sign that the beam section is undersized for the design load.

What should the handover documents include?

The handover file comprises six mandatory documents: as-built drawings, acceptance report, CO/CQ material certificates, design load table, warranty certificate and recommended inspection schedule. A missing document can void the warranty if an incident occurs.

1. As-built drawings. They must reflect what was actually installed, not the design drawings. The two often differ in a few places because of on-site adjustments.
2. Acceptance report. All 12 items, with actual measurements, signatures of both parties and the date.
3. CO/CQ material certificates. Origin and quality of each batch of steel used.
4. Design load table. Clearly stating the load per level, per bay and per run, with the corresponding level heights.
5. Warranty certificate. Duration, scope and the conditions that void the warranty (Long Quyen warranty: 24–60 months, depending on rack type and accessories).
6. Recommended inspection schedule. Weekly and 12-monthly intervals under EN 15635, with an inspection report template.

Keep this file for the whole life of the racking. When the company sells the warehouse or transfers the factory, it is an asset with real legal value — buyers will ask for it before valuing the property.

How to structure a proper acceptance report

A warehouse racking acceptance report needs four parts: project information, a table of measurement results, the conclusion and signatures. The most important part is the results table — it must record the actual measured value next to the permitted limit, not just tick Pass or Fail.

• Part 1 — Information: project name, location, contractor, installation date, acceptance date, drawing number used.
• Part 2 — Results table: one row per item with four columns — measurement, permitted limit, measured value, conclusion.
• Part 3 — Conclusion: pass or fail. If it fails, state which items, the deadline for correction and the responsible party.
• Part 4 — Signatures: the owner’s representative, the contractor’s representative and the person who took the measurements. Attach dated site photos.

A practical tip: record the measured value even for items that pass. The figures on acceptance day are the baseline for comparison in later warehouse racking safety inspections . Without a baseline, you cannot tell whether a 5 mm bow is new or has been there since day one.

Six common mistakes during acceptance

1. Accepting by eye, without measuring tools

40 mm of lean over 7 metres still looks straight. No plumb line, no acceptance — just a site visit.

2. Recording only Pass or Fail, with no figures

You lose the baseline for later inspections. A report like this is almost worthless after six months.

3. Skipping the load test to save time

It is the only item that verifies the load commitment. Skipping it means taking the contractor’s word without evidence.

4. Not counting beam safety locks

Missing locks are the most common defect and the easiest to fix — but only if found before goods are loaded onto the racking.

5. Accepting design drawings instead of as-built drawings

When you need to order replacement components a few years later, drawings with the wrong dimensions will lead you to order the wrong parts.

6. Signing a conditional acceptance

The warehouse will be loaded the next day. After that, offloading to make repairs costs many times more than having the contractor fix things before signing.

Frequently asked questions

How long does a racking acceptance inspection take?

About half a working day for two people for a 1,000 m² warehouse, not counting the load test. The load test must be held for at least 24 hours, so acceptance is usually done in two stages: geometry first, load test results the next day.

How much upright lean requires correction?

More than H/350 for standard-aisle warehouses, or more than H/500 for VNA warehouses. A 7,000 mm upright may lean 20 mm in Class 400 and 14 mm in Class 300.

Who may sign the acceptance report?

At least three signatures: the owner’s representative, the installation contractor’s representative and the person who took the measurements. The person measuring should be an experienced technician, not a warehouse employee asked to sign on someone’s behalf.

Is a load test mandatory at acceptance?

It is not required by Vietnamese law, but it is good practice and should be written into the contract. It is the only way to verify the load commitment before the warehouse goes into real operation.

How soon after acceptance should racking be inspected again?

Under EN 15635: weekly visual inspections by the person responsible for racking safety, plus an in-depth inspection at least every 12 months by a technically competent person.

What should an older warehouse that was never accepted do?

Carry out a condition assessment covering all 12 items and use the results as the baseline for future inspections. If the original drawings no longer exist, the whole configuration must be re-measured and the permitted loads recalculated.

The contractor says the deviations are within tolerance — can I trust that?

Ask for the actual measurements to be written into the report instead of arguing. The figures speak for themselves, and they also protect the contractor if the racking later fails for another reason.

Get a racking installation quote within 2 working hours

Every warehouse has its own challenge: floor area, ceiling height, pallet loads, throughput. Long Quyen’s engineers survey your site and propose the optimal solution for your actual warehouse — free of charge, with a commitment to acceptance within EN 15620 tolerances. Fill in the form below to receive a racking quote within 2 working hours.

Long Quyen Manufacturing & Trading Co., Ltd. — nearly 30 years manufacturing industrial racking (since 1997), 500+ projects.
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