Where to put your UniFi access points in a house

Ubiquiti's residential and small-business AP lineup splits cleanly by mount type. The mount type isn't cosmetic — it determines which way the antenna's main lobe points, which determines what the AP is good at covering.

Gain numbers above are published by Ubiquiti on each product's tech-specs page.¹²³ The U7-IW's 8 dBi at 5 GHz is the highest gain in the residential lineup — but that gain is directional, focused forward into the room the AP faces. Behind the wall plate, the same antenna is effectively silent. That is exactly what you want from an in-wall AP, and exactly the wrong shape for a hallway AP that needs to cover both directions.

Picking the right form factor is half of placement. The other half is putting that form factor in a location where its pattern actually does work.

Indoor radio propagation has a recommended model from the ITU's Radiocommunication Sector:ITU-R Recommendation P.1238 — Propagation data and prediction methods for the planning of indoor radiocommunication systems and radio local area networks in the frequency range from 300 MHz to 450 GHz, currently at revision 13 (September 2025).⁵ The companion recommendation P.2040 — Effects of building materials and structures on radiowave propagation in the range of 1 MHz to 450 GHz — tabulates real measured penetration losses for the materials a real building is made of.⁶ These two ITU-R recommendations are the formal source for the numbers below; the practical wireless-engineering literature (Cisco, Aruba, Ekahau, and Ekahau-trained wireless surveyors) cites slightly varying values for the same materials because real walls are inhomogeneous mixes of gypsum, lumber, plumbing, wiring, and insulation. The order of magnitude is consistent across every published source.

Read the table by adding the dB cost of every obstacle in the path from AP to client. A laptop in a bedroom on the second floor, with an AP two rooms away on the first floor, might be paying 6 dB for one drywall partition, 8 dB for a hardwood floor, and 4 dB for another drywall partition — 18 dB total at 5 GHz. An AP that puts -52 dBm into the air at the source delivers roughly -70 dBm at the client before any further free-space loss. That is the threshold below which most 5 GHz clients start refusing to use higher MCS rates and the connection feels slow.

The same path at 6 GHz costs roughly 25 – 30 percent more dB through the same materials. Wi-Fi 6E and Wi-Fi 7 trade 6 GHz's cleaner-band advantage against shorter effective range — which is a real placement constraint we'll come back to in § 09.

Ubiquiti publishes per-model 2D azimuth and elevation radiation patterns, plus 3D plots, in the help-center article AP Antenna Radiation Patterns.⁴ The plots look intimidating; they answer two practical questions.

1. Where is the strongest lobe pointing?

For ceiling APs (U6-Pro, U7-Pro, U7-Pro Max), the strongest lobe points straight down. The azimuth cut — looking up at the AP from below — is close to circular; the elevation cut — looking at the AP from the side — is heart-shaped, narrow on top (toward the ceiling above) and wide on the bottom (toward the floor below). That is what you want from a ceiling AP: a dome of coverage in the room beneath it.

For in-wall APs (U7-IW), the strongest lobe points outward from the wall plate, away from the wall. The pattern is asymmetric: full strength forward, near-zero strength behind. That is what you want from an in-wall AP: it lights up the room in front of it without wasting RF on the wall behind it.

For wall-mount APs (U7-Pro Wall) and outdoor APs (U7 Outdoor), the pattern is hemispherical or sector-shaped depending on the housing. The wall-mount version is designed to project from one wall into a single large room — a living room or a great room — without the circular waste a ceiling AP would have when mounted on a wall.

2. Where are the nulls?

Every antenna has nulls — directions where the radiated power drops sharply. For ceiling APs the primary null is directly above the AP, where the ceiling itself is. That is fine in a single-story home and matters in a two-story home: a ceiling AP in a first-floor room provides almost no usable signal to the room directly above it. The mechanism is not hardware-defective — it is the antenna pattern working as designed.

The practical takeaway is simple: orient the AP so its main lobe points intothe volume you want covered, and accept that the area in the antenna's null is not what that AP can cover. If the null is pointing at a critical room, that is not the right AP or the right mounting position for that room — pick another AP, or mount this one differently.

1. Inside an AV / media closet, next to the rack

The most common single placement we find on residential audits is an AP mounted on a shelf inside the AV closet, alongside the rack of audio amplifiers, the NVR, and the cable-TV gear. The reasoning is cable-routing convenience: the closet has the patch panel, so the AP gets dropped next to it. The consequence is brutal. Metal AV racks attenuate broadside RF by 15 – 25 dB. A steel-cored closet door adds another 15 – 30 dB (see § 03). The AP is loudly broadcasting into the rack and inaudibly broadcasting into the rest of the home. Move the AP outside the closet, onto the ceiling of the adjacent hallway or living area, and pull a longer Ethernet run to it.

2. Above (or behind) the refrigerator

Kitchens are common sites for AP placement because they have ceiling power, central layouts, and good line-of-sight to adjacent rooms. The refrigerator — metal cabinet, foam insulation, condenser coils, water — is one of the most opaque objects in a home to 2.4 and 5 GHz RF. Mounting an AP directly above or immediately behind the fridge puts the appliance's metal body in the main lobe's path. Move the AP at least 1 m horizontally away from large kitchen appliances, ideally on the opposite side of the ceiling from the appliance bank.

3. In a corner, facing into the drywall

Corner placements happen because they look clean — the AP tucks out of sight. But a ceiling-mount AP in a wall-ceiling corner is being asked to radiate its strongest downward lobe through the side of the building, where roughly half the AP's usable coverage is now wasted illuminating the neighbour's lawn instead of the room you live in. For a wall-mount AP in a corner facing into drywall, the situation is worse: the strongest forward lobe points into the wall, and the entire usable pattern is the backscatter. Mount ceiling APs roughly centred in the area they cover, not at the building edge. Mount wall APs facing into the room, not into the corner.

4. In a concrete-walled basement utility room

A basement utility or mechanical room has every attenuator. Concrete walls (20 – 30 dB at 5 GHz), an HVAC unit (the duct work acts as a large metal reflector), a hot water heater (more metal), and often a sump-pump pit or floor drain. An AP placed here is in a faraday-cage-adjacent environment. Its useful coverage is the utility room itself; the rest of the basement gets crumbs; the ground floor above gets almost nothing through the concrete deck. Either the basement needs its own dedicated AP somewhere outside the utility room, or wiring should be pulled up through a stairwell or chase to put the AP where its signal can actually reach where people are.

5. On a desk under a wall-mounted television

A wall-mounted flat-panel TV is a metal-backed rectangle. An AP sitting on a desk or shelf immediately below or beside it is broadcasting upward and back-reflecting off the TV's metal chassis. The result is a strange asymmetric pattern where the room in front of the TV is well-covered, the room behind it is not, and one or two specific directions get unpredictable multipath. Move the AP at least 0.5 – 1 m away from any large wall-mount display; ceiling mount is better.

6. Behind the TV in the entertainment console

The closest variant of the closet problem. The AP sits in the cabinet under the TV, between the AV receiver, the cable box, the game console, the streaming stick — all of which are emitting their own RF noise — and is being asked to project through the back of the cabinet and the back of the TV screen. The cabinet itself often has a sheet-metal back panel. The pattern looks like an AP trapped in a small metal box, because that is what it is. Bring the AP out of the cabinet entirely — ceiling or in-wall placement in the same room.

The diagnostic that catches all six on audit is the same: in the UniFi controller, the AP in question shows abnormally high transmit retries and abnormally low client signal levels for clients only 3 – 5 m away. The radio is fine; the air around it is obstructed.

The starting heuristic, refined from Ubiquiti's own high-density WLAN guidance applied at residential density, is straightforward:⁷

• Mount on the ceiling. Ceiling-mount APs (U6-Pro, U7-Pro, U7-Pro Max) belong on the ceiling. Their published radiation pattern is designed for downward projection; mounted on a wall or shelf, half the pattern is wasted on the floor or ceiling above the AP.
• Roughly centred in the area covered. Centre of a room or hallway, not the corner, not against an exterior wall. The goal is a roughly circular pattern radiating outward from a central point.
• Half a metre of clearance from anything metallic.Ductwork, HVAC returns, can lights with metal trims, recessed-light transformers, speaker grilles — anything metal within roughly 500 mm of the AP distorts the pattern.
• Roughly one AP per 1000 – 1500 sq ft of drywall-walled space.This is a starting point, not a rule. A single-story 1500 sq ft home with drywall interior walls is usually well-served by one well-placed ceiling AP. A 3000 sq ft home benefits from two, placed to overlap modestly at the boundary between the rooms they each cover.
• Match overlap to client mobility. Two APs covering adjacent zones should overlap by roughly 15 – 20 percent at -65 to -67 dBm — enough that a phone walking between them has somewhere to hand off to, not so much that the client gets stuck on the further AP. This is the same cell-overlap discipline the over-deployment article covers in detail.

For homes with pre-war plaster-and-lath walls, brick interior partitions, or thick stone construction, the heuristic shifts: each room may need its own AP, because each interior wall costs 8 – 20 dB. Older townhouses in the northeast U.S. and many masonry-construction homes elsewhere fall in this category. The fix-by-tuning still applies (lower transmit power, disable 2.4 GHz on all but one AP — see the companion article on too many APs at too high power), but the count is higher than it would be in a drywall-construction equivalent.

Vertical coverage through a residential floor deck — joists, subfloor, finish flooring — costs 6 – 10 dB at 5 GHz for hardwood and 8 – 12 dB for tile (§ 03). That is too much to rely on a single AP covering more than one story in any but the smallest home. Per-floor placement is almost always correct.

The heuristic for a two-story home with one AP per floor:

• Stack vertically — but not directly above each other. Place the first-floor AP and the second-floor AP so they cover their respective floors well, with the boundary of one cell at the vertical projection of the other AP. If both APs are at the exact same horizontal position, they create maximum cell-overlap through the floor — and the over-deployment problems the companion article documents.
• Alternate quadrants where possible. In a four-quadrant floor plan, put the first-floor AP in the front-left quadrant and the second-floor AP in the back-right. The asymmetric placement spreads coverage and reduces the through-floor cell overlap.
• Consider 5 GHz only on the upper-floor AP.The first-floor AP is usually closer to the gateway, the IoT mass, the wired devices. Concentrate 2.4 GHz on the lower AP so older smart-home devices stay near their controllers and the upper-floor AP runs 5 GHz (and 6 GHz) only.
• The basement question. Most finished basements need their own AP. The concrete-deck and HVAC-thicket attenuation from the first floor is usually too high to extend coverage downward. Outdoor-rated APs are sometimes the right answer for an unfinished basement that takes humidity damage; otherwise a standard ceiling AP in the most central reachable point works.
• Attic and crawlspace APs are usually wrong.The attic is hot, dusty, and on the wrong side of the ceiling insulation. Coverage from an attic AP into the second floor pays for ceiling joists, insulation batts, and the second-floor ceiling itself — 10 dB or more of unnecessary loss. Put the AP on the second-floor ceiling, not in the attic above it.

Three-story homes follow the same pattern with one AP per floor. Townhouses and brownstones — common in NYC — are an unusual case because they are tall and narrow with masonry interior walls; vertical penetration is often worse than horizontal, and per-floor APs are correct but their placement on each floor matters more because each floor is fewer rooms.

Ubiquiti publishes a free, browser-based design tool at design.ui.com that lets you upload a floor plan, scale it to real dimensions, drop UniFi APs onto it, and see the predicted RF coverage. It is the same tool Ubiquiti's own pre-sales and installer-partner workflow uses. For a residential audit it is more than enough; for very large commercial sites it can be supplemented with a paid surveying tool (Ekahau, Hamina) that takes real on-site measurements.

The residential workflow:

1. Get a floor plan.A scanned PDF from the builder, an architect's drawing, or a hand-drawn-then-scanned sketch — anything in JPG / PNG / PDF at recognisable proportions.
2. Upload and scale it.The Design Center lets you click two points on the plan and enter their real distance — usually a doorway width (typically 0.9 m / 3 ft) or a wall length taken from the drawing. That sets the scale for every subsequent measurement.
3. Draw the walls. Trace exterior and interior walls and tell the tool what they are made of — drywall, brick, concrete, glass. The tool applies the corresponding attenuation when it predicts coverage. This is where the realism comes from: the same AP placed in a drywall home and in a brick row-house produces dramatically different predicted coverage in the tool.
4. Drop the APs.Pick the UniFi model you intend to use (the tool knows each model's published antenna pattern) and place it on the plan. The predicted -65, -70, -75 dBm coverage contours render automatically. Move the AP around; watch the contours change.
5. Iterate against the dead zones.If there is a corner room where the predicted signal drops below -75 dBm, move an AP, add an AP, or change a wall type if you misclassified it. The iteration takes minutes, not hours.

Two caveats. First, the tool models flat coverage contours; it does not model ceiling height, floor attenuation between stories, or appliance reflectance. For two-story homes, simulate each floor separately and treat the through-floor coverage as bonus, not primary. Second, the tool models steady-state RSSI, not airtime contention — it will tell you whether a given client position has signal, not whether the AP can give it useful throughput when twenty other devices are also asking for airtime. The over-deployment article covers the airtime side of the same question.

Wi-Fi 6E (U6-Enterprise) and Wi-Fi 7 (U7-Pro, U7-Pro Max, U7-Pro XGS, U7-IW, U7-Pro Wall) add a third band: 5.925 – 7.125 GHz, the 6 GHz band, opened to unlicensed use in the U.S. by the FCC in 2020. The band is clean — far fewer neighbouring networks, much more spectrum, room for wide 160 MHz and even 320 MHz channels without the DFS-radar concerns of 5 GHz. The tradeoff is range: at 6 GHz, free-space path loss is roughly 1.5 dB higher than at 5 GHz for the same distance, and material attenuation (§ 03) is consistently 20 – 30 percent higher.

For placement, the consequences are:

• 6 GHz needs denser AP placement than 5 GHzfor the same coverage footprint. A home where one ceiling AP covers everything at 5 GHz may have noticeable 6 GHz dead zones in the corner rooms. The same AP placement that “just works” on Wi-Fi 5 and Wi-Fi 6 may need an extra unit to get full 6 GHz coverage.
• Through-wall 6 GHz coverage is weaker.The corner office that gets -65 dBm at 5 GHz might be at -75 dBm at 6 GHz from the same AP — borderline unusable. Clients that prefer 6 GHz will experience this as “the new network is slower in my room than the old one,” even though the 5 GHz coverage hasn't changed.
• 6 GHz placement is forgiving in one way.Because the band is so much cleaner, cells can overlap less aggressively without losing to neighbour-AP interference. The cell-overlap discipline that matters at 2.4 and 5 GHz is less critical at 6 GHz — for now, while the band is still under-used.

The practical recommendation: if a residential network is being designed for full 6 GHz coverage, plan roughly one AP per 800 – 1100 sq ft instead of the 1000 – 1500 sq ft starting point for 5 GHz-only coverage. If 6 GHz coverage doesn't need to reach every corner — for example, because the homeowner only cares about 6 GHz in the room with the new laptop and the new phone — the lower-density 5 GHz design is fine and the 6 GHz dead zones are acceptable.

• Attenuation numbers are ranges, not constants.The dB values in the § 03 table are ranges drawn from ITU-R P.2040 and the wireless-engineering literature. A specific wall in a specific home will land somewhere in that range depending on water content, embedded wiring, plumbing, and insulation. The order of magnitude is reliable; the second significant digit is not.
• Ubiquiti's antenna pattern plots are free-space measurements. Mount the same AP in a real ceiling cavity, surrounded by HVAC and recessed lighting, and the pattern distorts. The published plot is the right starting point; the real installed pattern can deviate by several dB in any direction.
• Client antennas are the bigger asymmetry. A laptop with a properly designed antenna pair in the lid behaves very differently from a phone held against the user's head from a smartwatch on a wrist. Phone clients always lose 3 – 6 dB to body absorption when held in hand. No amount of AP placement work can fix client-side issues. The over-deployment article's section on the near-far problem covers this asymmetry in more detail.
• Design Center predictions are predictions. A simulated coverage map is exactly that — a simulation. Final placement should be checked with a phone-based survey app once the APs are mounted, to catch the cases where the simulation missed an embedded steel beam or an unusual wall composition.
• This article does not cover outdoor link budget. Outdoor APs (U6-Mesh, U7-Outdoor) and point-to-point bridges (UWB, AF-series) follow different rules: longer free-space range, no building-material attenuation, but rain and foliage fade, Fresnel-zone clearance, and line-of-sight considerations. Those belong in a separate article.
• We do not publish home-specific survey numbers. The audit produces a written report for a specific home, not a public dataset. The placements and dB ranges described above are what the cited primary sources (Ubiquiti, ITU-R, IEEE) document, applied to the kind of homes we see on audit — not a statistical claim about every home in some sample.

None of these caveats changes the headline. The physical placement of a UniFi access point is a bigger lever on real-world coverage than the model printed on the box. Get the placement right, and a modest residential AP outperforms a premium one in the wrong location. Get the placement wrong, and no amount of additional hardware fixes it — that is the pattern the companion article on too many APs at too high power documents from the other direction.