Before You Add Another Access Point: A Practical Office Wi-Fi Site-Survey Checklist

The Wi-Fi is bad in the back corner, so someone orders another access point and plugs it in. Sometimes that helps. Often it adds interference, makes roaming worse, and leaves you with one more thing to troubleshoot.

A site survey tells you whether the office needs different placement, a configuration change, more capacity, or new hardware. Measure first, then buy.

Start With How the Space Is Used

Walk through each area and write down:

• How many people and devices use it, and what kinds
• Voice, video, scanning, payment, and line-of-business applications
• Busy periods and crowded rooms
• Separate guest and staff network needs
• Where people move around while connected
• Devices that only support certain bands or security methods
• Spots where cabling or power limits where an access point can go

A quiet hallway and a full boardroom don't ask the same things of Wi-Fi.

Get a Floor Plan

Use a current one and mark existing access points and their mounting heights, walls, doors, shelving, machinery and other obstructions, network closets and cable routes, and the places people complain about. Add conference rooms, reception, warehouse areas, and outdoor work zones. If neighbouring tenants have their own networks, note that too.

Write down what the building is made of. Concrete, metal, glass, and storage racks all treat a signal differently.

Record the Current Setup

Before you measure anything, capture:

• Access point models, firmware, and radio capabilities
• Channels and channel widths
• Transmit power
• Network names and security settings
• Band steering, roaming, and minimum data rate policies
• Client counts and traffic patterns
• Switch port speed, power, and error status

Without this you can't link a finding to a specific fix.

Measure Coverage Where People Work

Take readings at desks, counters, meeting seats, corners, and corridors. Record signal strength, signal-to-noise ratio, noise floor, which bands are available, which access point and radio the device is using, and basic latency, packet loss, and throughput where it makes sense.

Hold the test device the same way and use the same measurement points each time. One reading in the middle of a room tells you very little.

Check Channels and Interference

Survey every band you use. Look for co-channel contention, overlapping channels, channels set wider than the space can support, strong neighbouring networks, non-Wi-Fi interference, retransmissions, high channel utilization, and radios that blast farther than the area they're meant to cover.

Note the time of each measurement. An empty office at 7 a.m. looks very different from a busy Tuesday afternoon.

Test Capacity at Peak

Good coverage doesn't prove an access point can carry the load. Look at active clients per radio, channel utilization in busy periods, the mix of applications, meeting-room density, devices stuck on a congested band, and any access point carrying far more than its neighbours. If you can, repeat the key measurements during normal peak activity.

Walk the Roaming Paths

Take a voice call or another continuous application and walk your usual routes. Note where the device switches access points, whether latency or packet loss jumps, whether the call pauses or drops, whether the device clings to a distant access point, and whether security settings match across the whole network.

Different devices roam differently, so test with the phones and laptops your staff really use, not just the survey laptop.

Check the Wired Side

An access point depends on cabling, switching, power, internet, DNS, and firewall performance. Look at cable test results and negotiated link speed, switch errors and power delivery, uplink capacity, internet latency and packet loss, DNS response, and any firewall or filtering limits.

If wired users have the same problem, more Wi-Fi hardware won't fix it.

Turn the Data Into a Decision

For each problem area, write down the evidence and the action it points to. That might be moving or remounting an access point, adjusting channels, widths, or power, adding capacity in a crowded area, repairing cabling or switch connections, replacing unsuitable hardware, or removing an access point that's causing interference. Retest after each controlled change.

Keep the before-and-after data. It gives you a baseline for the next complaint and shows whether the change improved what your staff actually do all day.

Related Reading

If you're weighing new hardware, read our Wi-Fi 6, 6E, and 7 upgrade guide too. A survey gives that decision real numbers to work from.