Why AP placement is about more than floor area
In my experience installing UniFi networks in small offices and multi-room suites, the most common reason Wi‑Fi underperforms isn’t a bad AP — it’s a mismatch between coverage planning and capacity planning. A single AP can blanket a 1,500 sq ft area with signal, but if that area has a conference room with twenty devices streaming video, the link will be congested. This guide focuses on practical steps to place APs so they meet real-world use: reliable VoIP, video conferencing, roaming between offices, and stable guest access.
Start with a short site survey, even if simple
Before mounting anything, walk the space with these objectives:
- Mark high-use spots: conference rooms, reception, shared desks, printers.
- Note obstacles: concrete walls, elevator shafts, server cabinets, kitchens and break rooms (microwaves), and large metal filing cabinets.
- Identify noisy RF sources: cordless phones, Bluetooth hubs, microwaves, and LED drivers.
- Plan cabling paths and candidate switch locations (network racks or wall closets).
Even a quick paper sketch with circles for high-use areas gives a much better starting point than guessing by square footage.
Coverage targets and signal goals
Set realistic signal-strength goals based on the expected client use:
- -65 dBm or better for general browsing and most mobile devices.
- -60 to -65 dBm for reliable video calls and VoIP in shared rooms.
- Avoid designing to -75 dBm as your primary target — that’s typically marginal for interactive applications.
Remember these are practical targets to aim for where people work or sit, not in every hallway. Corridors and storage rooms can tolerate weaker signals.
Balance coverage and capacity
Two important roles for APs:
- Coverage: ensuring every seat has adequate signal.
- Capacity: providing enough air-time throughput when many devices are active.
For capacity planning, estimate concurrent devices per area. Examples from experience:
- Small private office (1–2 people): plan for 2–6 concurrent devices.
- Open bullpen desk area (10 desks): plan for 15–30 concurrent devices, depending on hot-desking and peripherals.
- Small conference room (6–8 people): plan for 6–12 concurrent devices, more if attendees share screens or stream video.
Use an AP calculator to convert these densities into recommended AP counts rather than guessing by area. The UniFi AP calculator available on our site helps translate estimated client counts into AP placement and quantity: /unifi-ap-calculator/.
Practical placement rules
From thousands of small-site deployments, the following rules avoid most mistakes:
- Mount APs on or near the ceiling in open areas. Ceiling mounting gives more uniform coverage and reduces obstruction from furniture.
- In conference rooms, center the AP over the table when possible. If cabling prevents this, place the AP near the doorway and aim for signal presence over the table.
- For narrow long rooms (corridors, server rooms), use wall mounts at about 7–8 ft high and point the AP into the space instead of over a corner.
- Keep APs at least 8–10 ft from heavy metal obstructions and large electronic transformers or fluorescent light fixtures.
- Avoid hiding APs inside metal cabinets or tightly closed ceiling plenums — that reduces both coverage and cooling.
Channel planning and radios
Practical channel advice:
- Use 5 GHz for capacity: it has more non-overlapping channels and higher data rates. Prefer 5 GHz in conference rooms and high-density desks.
- Keep 2.4 GHz available for legacy IoT and devices with poor 5 GHz support, but don’t rely on it for capacity. Remember it has limited non-overlapping channels, so keep power conservative and avoid wide channel widths there.
- Let controller-driven automatic channel selection handle the initial deployment, then monitor for persistent interference and manually adjust if needed.
PoE and power planning
APs draw power from switches. Check the power profile and plan your switch PoE budget accordingly. Oversubscription is a common field failure: a switch might power three APs fine in light use but trip when devices start using radios heavily. Use a PoE budgeting tool to map AP models, their peak draw, and the switch ports to avoid surprises: /poe-budget-calculator/.
Cabling and backbone considerations
Run at least Cat6 to each AP location and a dedicated uplink from your access switch back to the core or router. For most small offices, a single gigabit uplink is sufficient; for heavy video-conferencing sites or clustered APs, consider link aggregation or 10 Gb uplinks where your budget allows. Plan your switch and patching location with a simple rack or wall cabinet — our network rack planner can help orient the physical layout and cable routes.
Testing after installation — a practical checklist
Run these tests immediately after APs are live:
- Heatmap: walk the space with a Wi‑Fi heatmap tool and verify your signal targets in seating areas and conference tables.
- Throughput: run upload and download tests from representative client devices in the worst seating locations.
- Roaming test: start a video call on a client device, walk between AP coverage areas and verify the call doesn’t drop or lose noticeable quality.
- Capacity test: simulate concurrent clients (or use real client load) in conference rooms to verify performance under expected peak usage.
- Interference check: observe if any persistent noise appears on either band. If so, identify and mitigate the source or adjust channels.
If you see unexpected behavior, our troubleshooting guide is a good place to start diagnosing common issues: /unifi-troubleshooting/.
Common pitfalls and how to avoid them
Lessons from fieldwork:
- Don’t under-estimate conference rooms. A single AP placed outside the room rarely delivers the latency and sustained throughput needed for multiple video streams.
- Avoid overloading an AP by clustering too many APs in an attempt to boost signal. This creates co-channel interference and hurts roaming.
- Don’t rely only on theoretical range. Furniture layouts, glass partitions, and shelving change RF propagation dramatically.
- Remember client behavior: mobile phones and tablets frequently hold weaker modulation rates at lower signal levels. Good AP placement compensates for that behavior.
When to call for help
If you’ve followed the placement rules, run the tests above, and still see issues, the problem often involves one of these: complex RF environment, large numbers of concurrent clients, or cabling/PoE problems. Remote support can resolve many configuration and design questions; on-site visits help when physical obstacles or wiring need remediation.
FAQ
How many APs do I need for a small office with a conference room?
It depends on capacity needs. A rough starting point: one AP per 1,000–1,500 sq ft for light office use, plus a dedicated AP inside or right above a conference room used for multi-person calls. Use an AP calculator for a density-based estimate: /unifi-ap-calculator/.
Can I reuse a single AP for both the open office and a conference room?
Sometimes for very small rooms and light usage. For reliable multi-person video calls or presentations, place an AP inside the room or as close to the center as cabling allows.
Do APs need a controller running 24/7?
UniFi controllers make monitoring and configuration easier; however, many UniFi APs will provide basic L2 connectivity without a controller. For group policy, guest portals, and advanced monitoring, keep a controller online or use a cloud-hosted option.
How high should I mount an AP?
Ceilings are ideal. If ceiling mounting isn’t possible, place APs on walls about 7–8 feet high and oriented into the space. Avoid floor-level or inside cabinets.
Independent-service disclaimer
This article is informational and based on hands-on experience. unifisetup.com provides independent UniFi network installation in Virginia and North Carolina (including the Outer Banks) and remote support across the USA. We are not affiliated with the UniFi manufacturer.
Notes: the recommendations here are practical field guidance. Always verify device power, mounting hardware, and local building codes before installation.