Wireless Site Surveys Explained

Why square footage math fails

The most common way commercial Wi-Fi gets designed is to divide the building's square footage by a number from a vendor datasheet. That works in an empty box with drywall partitions. It fails the moment the building has masonry, plaster, foil-backed insulation, coolers, freezers, racking to the ceiling, or a room that fills with sixty people twice a day. Those are the buildings where someone ends up paying twice — once for the original install and again for the drops that were missed.

• Material matters more than distance — masonry and metal end coverage fast
• Racking and stored inventory change a warehouse's coverage as it fills
• Glass and open ceilings create reflections a datasheet doesn't model
• Neighboring tenants occupy channels you were planning to use

Coverage and capacity are separate problems

Coverage is whether the signal reaches a location. Capacity is whether the network can carry the number of devices in that location at its busiest moment. They are measured differently and solved differently, and confusing them is why some buildings have full signal bars and unusable Wi-Fi. A conference room with strong signal and one access point serving forty laptops is a capacity failure, and turning up transmit power makes it worse rather than better.

• Coverage: signal reach, cell overlap, and edge performance
• Capacity: device count at peak, not average, per area
• Roaming: enough overlap that phones and scanners hand off without dropping
• More power is not more capacity — it usually adds interference

What a real deliverable contains

A survey you can build from is a document, not a screenshot. If what you receive is a single colored floor plan with no access point locations and no drop schedule, it isn't finished — the cabling crew still has to guess, which was the problem the survey was supposed to solve.

• Coverage heat maps for the bands being deployed
• Access point count with specific, buildable mounting locations
• A PoE drop schedule the cabling crew or electrician can work from
• Channel, band, and transmit power recommendations
• Named problem areas and what solving each would take
• Assumptions stated plainly, so they can be challenged

When it's worth paying for

A survey is not mandatory on every job, and any contractor telling you it is should be questioned. A dozen drops in an open-ceiling office with a simple layout does not need one. The cost is justified when the building is difficult, when the design is not obvious, or when somebody is about to commit real money to an assumption.

• Warehouses, high-bay, cold storage, and industrial space
• Older buildings — plaster, masonry, foil-backed insulation
• High-density rooms: dining, training, conference, waiting areas
• Environments where handhelds or VoIP phones must roam reliably
• Existing networks with complaints nobody has diagnosed
• Multi-site rollouts, where the first survey becomes the standard

Questions to ask whoever is surveying your building

Survey quality varies enormously, and the word gets used for everything from a proper measured walk to five minutes with a phone app. These questions separate them quickly.

• Which type are you running — predictive, validation, or verification?
• Will I get access point locations and a drop schedule, or only heat maps?
• How are you accounting for the room at its busiest, not empty?
• Are you surveying the bands we'll actually deploy?
• Will you verify coverage after installation, and is that included?
• If I don't buy the install from you, is the documentation still mine?

How surveys get priced

Survey pricing follows building size, complexity, and how many survey types the project needs — a single-floor office is not a 300,000 square foot warehouse with racking. Atkins Tech Solutions quotes survey and design as its own scope and states up front how it carries into an install quote, so the survey is never a hidden commitment to buy the installation.