A warehouse bin location system gives every zone, aisle, bay, level and bin a unique, readable code and records each item against it. The code sits on the rack label as a barcode, scanned at putaway and picking. The answer to "where is it?" then lives in the system, not in someone's memory, and can be checked.
What a day looks like in a warehouse without locations
Without locations, your system knows how many units you hold but not where they are. When a pick list arrives, an experienced operator walks straight to the spot they remember; a new starter walks every aisle. When that person is on leave, picking slows and wrong-item picks rise.
Goods at receiving wait in the aisle until someone finds "a free spot". During counts, items that exist on the system but cannot be found are written off, only to turn up later in another corner. When one product is spread across three unrecorded spots, stock rotation rules such as FIFO and FEFO become impossible to follow, because nobody knows which batch is where.
A bin location system changes that picture: every stock movement becomes a recorded transfer from one address to another. The putaway suggestions, pick paths and cycle counts of a warehouse management system (WMS) are all built on this location data. This article focuses on designing that foundation, not on WMS as a whole.
The cost of leaving it unsolved
In a warehouse with no location data, errors grow in the gap between the record and the shelf. One widely cited study shows how common supply-chain data errors are when movements are not verified:
In a study by GS1 US and the Auburn University RFID Lab, 69% of orders shipped from brands to retailers contained data errors when RFID was not used, while those using RFID achieved 99.9% order accuracy. (GS1 US and Auburn University RFID Lab, EPC/RFID Retail Supply Chain Data Exchange Study, 2018)
The study dates from 2018 and is about RFID, but its lesson is technology-neutral: where movements are not scanned and confirmed, errors are the norm rather than the exception. A location barcode supplies the "where" half of that confirmation.
Even working out where losses happen requires knowing where stock should be. According to the NRF National Retail Security Survey 2023, the average US retail shrink rate rose from 1.4% to 1.6% in FY2022, representing $112.1 billion in losses. The figure is for the US, but without location records you cannot tell whether a gap came from theft, misplacement or a mis-shipment.
In Türkiye, the paperwork side is digitising quickly. Delivery notes are increasingly issued electronically through the e-Waybill (e-İrsaliye) scheme run by the Revenue Administration (GİB); its 2025 Annual Activity Report shows the number of taxpayers using it rising from 402,985 in 2024 to 632,288 at the end of 2025. When the dispatch document is created in seconds, searching the racks for the goods becomes the slowest link; our guide to e-Waybill in Türkiye covers that transition.
How to structure warehouse location codes
A good location code is logical enough that an operator standing in the aisle knows where to go before reading the label. The most common structure is hierarchical: Zone – Aisle – Bay – Level – Bin. For example, A-03-12-2-B means zone A, aisle 3, bay 12, level 2, bin B.
Points to settle when designing the code:
- Fixed length with leading zeros. Writing
03instead of3keeps sorting and reading consistent. - Numbering that follows the walking path. Odd numbers on one side of the aisle and even numbers on the other let operators follow locations in sequence and make pick routes easier to plan.
- No easily confused characters. Letters such as O and I are mistaken for 0 and 1, both on labels and when read aloud.
- A check digit. A short two- or three-digit verification number on the rack label catches reaches into the wrong bin, especially in voice picking systems.
- Room to grow. Leave gaps in the numbering so that a new aisle or mezzanine does not force you to renumber the whole building.
Block-stacked floor areas have no racks, so the address becomes a block-row-position code painted on the floor or shown on hanging signs. Receiving, quality quarantine, returns and dispatch staging should also be set up as distinct physical locations; otherwise stock looks as if it is on a shelf when it is actually sitting on the dock.
Fixed or dynamic? Comparing slotting strategies
Beyond the code, you choose the rule for which product goes where: two basic strategies, or a hybrid.
| Criterion | Fixed locations | Dynamic (random) locations | Hybrid |
|---|---|---|---|
| Logic | Each product has a permanent home | Stock goes to any suitable empty bin; the system records it | Pick faces fixed, reserve stock dynamic |
| Space utilisation | Low; bins sit empty when stock runs out | High; free space is used immediately | Balanced |
| Dependence on the system | Low; staff can memorise locations | Total; without the record, stock cannot be found | Moderate |
| Best suited to | Small, stable product ranges | Wide, seasonal or fast-changing ranges | Pick-heavy sites with large reserve stock |
| Batch and expiry tracking | Batches can mix in one bin | Each batch can be held in its own location | Easy batch separation in reserve |
| Main risk | Informal overflow when space runs short | A skipped scan makes stock "disappear" | Pick faces run empty without replenishment rules |
In practice, many warehouses settle on the hybrid model. Pick faces for fast movers stay fixed, while pallet reserve stock is placed dynamically in high-bay racking, and the system raises a replenishment task when a pick face falls below a set level. Positioning fast movers near dispatch and at waist height (ABC slotting) is part of the same decision.
A 7-step framework for rolling out a warehouse bin location system
Location management is not a label-printing exercise; it is data and process design. The sequence below lets you switch over without stopping the warehouse.
- Measure the building and the flow. Map the floor plan, rack types, bin dimensions and load capacities, and classify products by how often they move, based on recent transactions.
- Define zones. Separate special areas such as chilled, hazardous, high-value, returns and quarantine, and write down the access and equipment rules for each.
- Lock down the code structure. Fix the hierarchy, character set, length and check digit, then write and sign off a one-page location standard.
- Build the location master data. Record type, dimensions, load capacity, zone and permitted product groups for every location. Putaway suggestions are only as good as this data.
- Label everything. Print both a human-readable code and a barcode on rack labels; our overview of GS1 barcode types helps you pick a symbol that will not be confused with product barcodes. Use long-range labels or floor-level scan signs for high bays, and materials suited to cold or damp areas.
- Load stock by counting. Count the warehouse zone by zone, scanning each item into its location; a handheld terminal stock count is the practical way to do it.
- Enforce the rules and measure. Make location scans mandatory at putaway, replenishment and picking, and measure location accuracy regularly through cycle counts.
One simple indicator is enough to judge success: the share of randomly chosen locations where the product and quantity on the system match what is physically on the shelf. Measuring it before and after the pilot shows the impact in concrete terms; for tracking it on a dashboard, see our piece on choosing BI dashboard KPIs.
Common mistakes in location projects
The most frequent mistake is designing the code around an existing spreadsheet rather than the physical layout, which produces numbers that jump illogically along the aisle. The second is leaving location scans optional. With dynamic slotting, a single skipped scan makes stock vanish as far as the system is concerned.
The third is expecting putaway suggestions without entering capacity and size data; the system then proposes a large pallet for a small bin, and staff stop trusting it. Finally, racking changes that never reach the location master data make the records meaningless within months; give location data a named owner.
On the picking side, locations are a prerequisite for planning methods such as wave picking. If you are weighing tag-based identification instead of barcodes, our guide to RFID inventory and asset tracking compares the two approaches.
How we deliver this at Digital Bridge
We treat bin location design as the first step of our warehouse and inventory management (WMS) projects. Because software and hardware come from the same team, responsibility for how the code structure, labels and scanners work together stays in one place.
- Discovery and needs analysis. We survey the warehouse on site, review stock movements and existing records, and decide with you between fixed, dynamic and hybrid slotting.
- Location standard and labelling. We document the code structure, design rack labels, and select and configure handheld terminals and data collection devices to suit rack heights and site conditions.
- Pilot. We set up locations in a single zone, measure location accuracy before and after, and tune the rules against real use.
- Integration. We map locations and stock movements to your existing ERP system, and connect Logo, SAP, Mikro, carrier or e-document systems through API integration.
For multi-site distribution and dispatch operations, see our logistics and transport solutions. We do not sell off-the-shelf packages: after the needs analysis, we present scope, phases and cost in a written proposal. Our guide on custom versus off-the-shelf software covers that choice, and more articles are collected in our software development guides.
Next step
This week, pick 20 products at random and ask two questions about each: does the system know where it is, and is it actually there? The gap between those two answers is the clearest measure of what a bin location system would give you. Then get in touch through our contact page, and we will review your warehouse together and draw up a concrete plan for the location standard and a pilot zone.