How to plan enterprise Wi-Fi coverage.

A Wi-Fi network that works well in a walkthrough with three people often falls over once the office is full — the difference is capacity planning, not coverage in the abstract.

Coverage is not the same problem as capacity

A single access point can often paint a whole floor with usable signal strength. That does not mean it can serve the 60 laptops, phones and video calls that will actually try to connect to it during a busy Tuesday. Enterprise Wi-Fi planning starts from device density per area, not square footage — how many concurrent users and devices a meeting room, open-plan floor or training room realistically holds.

What a proper survey accounts for

Building materials. Concrete, metal ducting and glass partitions all attenuate signal differently. A predictive survey that ignores the actual floor plan’s materials will under- or over-estimate access-point count.

Interference. Other access points (yours and neighbouring tenants’), microwave-adjacent frequencies, and channel overlap between nearby APs all degrade real-world throughput even when signal strength looks fine on a heatmap.

Roaming. Users moving between meeting rooms need their devices to hand off between access points without dropping a call. This depends on AP placement and configuration, not just raw coverage.

Guest isolation. Guest Wi-Fi should sit on its own segment, with no path back into corporate systems — a planning decision made alongside AP placement, not bolted on afterwards.

A practical planning sequence

1. Map device density per area — desks, meeting rooms, training rooms, common areas — not just square metres.
2. Survey the physical environment for materials and existing interference sources.
3. Place access points for capacity first, coverage second, with intentional overlap for roaming.
4. Validate with a post-install heatmap survey — the plan on paper and the result in the building are rarely identical on the first pass.
5. Segment guest, corporate and IoT/CCTV traffic onto separate VLANs from the start.

Skipping the validation step is the most common reason Wi-Fi “coverage” complaints keep coming back after installation — the network was never actually measured against how people use the space.