Wi-Fi installation for warehouses and manufacturing facilities

Why warehouses are different

Most Wi-Fi systems are designed for offices: regular floor plans, plasterboard walls, relatively low device density and users who stay mostly still. A warehouse is the opposite on almost every count.

Metal racking is the biggest challenge. Steel shelving absorbs and reflects radio frequency signals in ways that are difficult to model without a proper site survey. A single aisle of high-bay racking can create a dead zone that seems impossible to eliminate until you understand how the signal is bouncing. Access points positioned where they'd work well in an open-plan office often produce exactly the wrong result in a racked environment.

Height adds another variable. Warehouses with eight to twelve metre ceilings require a different access point placement strategy – ceiling mounts are often ineffective, and wall or column mounts at a lower height produce better signal penetration through the racking. The right answer depends on the specific layout.

Then there's movement. Forklifts, pickers and AGVs (automated guided vehicles) moving continuously through the space create a roaming environment that puts real stress on the wireless infrastructure. A device travelling from one end of a 10,000 sq ft warehouse to the other may cross the coverage boundary of multiple access points. If roaming transitions aren't handled correctly, connections drop and applications fail – exactly the kind of interruption you can't afford in a picking or dispatch workflow.

The devices you're supporting matter

Office Wi-Fi is mostly supporting laptops and mobile phones. Warehouse and manufacturing environments support a much wider range of hardware, and some of it behaves differently on a wireless network.

Barcode scanners and handheld terminals are often the most demanding clients from a roaming perspective. Many run older operating systems and use Wi-Fi chipsets that aren't as aggressive about switching access points as modern smartphones. This means they can stay associated with a distant, weak access point long after they should have roamed to a closer one – causing slow application response or disconnections that halt a picking workflow.

Industrial tablets and ruggedised handhelds are generally better behaved, but they need consistent throughput for real-time WMS (warehouse management system) updates, label printing and inventory queries. Latency spikes cause queuing at pick stations and slow down the whole operation.

Automated guided vehicles and conveyor systems increasingly use Wi-Fi for position telemetry and control signals. These applications have strict latency requirements. A WMS transaction that takes 200ms instead of 20ms is annoying. An AGV control signal with the same delay is a safety issue.

If you're also running CCTV, VoIP calls or IoT sensors – temperature monitoring, asset tracking, access control – across the same wireless infrastructure, the capacity and segmentation requirements become more complex still. We'd generally recommend separating operational technology traffic from general IT traffic at the network level, both for performance and security.

What a proper site survey involves

We'd never specify a wireless system for a warehouse or manufacturing facility without a physical site survey. The consequences of getting it wrong are too significant – a poorly designed system that's been installed and commissioned is expensive to fix.

A thorough survey covers:

• Walkthrough of the full facility, noting construction materials, ceiling heights and structural elements
• Assessment of racking layout and height – ideally with access to floor plans
• Identification of all Wi-Fi client devices and their roaming and throughput requirements
• Review of existing network infrastructure: cabling, switch locations and power availability
• RF spectrum analysis to identify sources of interference – machinery, neighbouring networks and industrial equipment can all affect the 2.4GHz and 5GHz bands
• Predictive modelling using specialist design tools, followed by validation with physical access point placement testing

For large facilities, we'll often do a phased survey – design and validate one section before committing to the full installation. It adds a small amount of time upfront but saves significant cost if adjustments are needed.

Access point selection and placement

Not all enterprise access points are equal in an industrial environment. Some manufacturers produce hardware specifically rated for warehouses and factories – IP ratings for dust and moisture, wider operating temperature ranges, impact-resistant housings and mounting options suited to column or truss installation. Using standard office-grade access points in a harsh environment increases maintenance costs and reduces reliability.

Placement depends on the specifics of the site, but some principles apply consistently:

Avoid overhead ceiling mounts in high-bay racking. The signal travels down through multiple metal shelves before reaching the devices and loses significant strength. Side-aisle or mid-column mounts at 3 – 5 metres typically give better penetration.

Plan for coverage overlap, not gaps. Access points should be positioned so that client devices always have a strong alternative to roam to. In an environment with mobile devices, there should never be a point in the facility where only one access point is visible.

Consider the wireless controller architecture. For facilities with more than a handful of access points, a controller – whether hardware or cloud-based – manages roaming transitions, band steering and load balancing centrally. This is where the difference between a properly managed roam and a dropped connection is determined.

Cabling and infrastructure

Wireless infrastructure is only as good as the wired network behind it. In warehouses, this often gets underestimated. Each access point needs a network connection and power – typically via Power over Ethernet (PoE) – and the structured cabling that supports this needs to reach every part of the facility.

In a new build or fit-out, this is straightforward to plan. In an existing facility, it can require significant cable installation work – running containment through high-bay racking, across gantries or along the underside of rooflines. That work needs to be scoped properly, priced honestly and carried out by someone who understands the environment.

It's also worth planning for future access point positions now, even if you're not installing them yet. Running containment to positions you might need in three years costs a fraction of the price of retrofitting it later.

OT and IT network separation

If your facility runs any operational technology – SCADA systems, PLCs, conveyor controls, AGVs or industrial sensors – the question of whether to run them on the same wireless infrastructure as your IT network needs a direct answer. Our position: keep them separate.

OT devices often run firmware that isn't regularly updated and wasn't designed with modern security in mind. Putting them on the same network as your WMS, ERP or corporate data introduces risk that isn't necessary. VLANs and firewalled segments provide a sensible boundary between the two environments without requiring completely separate hardware.

This is also increasingly a compliance consideration. Cyber Essentials and ISO 27001 both expect organisations to understand and control their network boundaries. An OT device that hasn't been patched in four years is exactly the kind of thing that comes up in an audit.

Getting it right from the start

The cost of a poorly specified warehouse Wi-Fi installation is almost always higher than the cost of a proper one done right. Picker productivity drops, WMS queries time out, and the IT team spends disproportionate time chasing wireless complaints that can't be resolved without redesigning the system from scratch.

We'd recommend involving a wireless specialist early – ideally at the point where a new facility is being fitted out, when cabling routes are still accessible and access point positions can be planned before racking goes in. For existing facilities with poor coverage, a survey-first approach gives you a clear picture before any money is spent on hardware.