Three spaces come up in almost every Wi-Fi conversation we have: the finished basement, the detached garage, and the backyard ADU or guest house. All three are the hardest rooms to cover, for different reasons, and all three are where people actually use Wi-Fi the most — gaming, streaming, home office, workshop streaming, and Airbnb guests.
Here’s how to plan coverage for each one, what actually works versus what sounds like it should work, and how to avoid the classic mistakes.
The finished basement
Why it’s hard
A basement sits below grade, surrounded by concrete foundation walls and a concrete slab above (under the main floor). Concrete and rebar attenuate Wi-Fi aggressively — a 5 GHz signal loses 15–25 dB passing through a typical poured-concrete floor. An AP on the main floor that delivers 500 Mbps in the kitchen might deliver 30–80 Mbps one floor down.
6 GHz (Wi-Fi 6E/7) is even worse through concrete — higher frequencies attenuate faster. The band that gives you the best performance in the same room gives you the worst performance through a floor.
What works
- A dedicated AP in the basement. Not relying on signal from upstairs. A ceiling-mounted AP at the top of the basement ceiling, wired back on Cat6 to the network closet. This is the single biggest improvement you can make.
- Placement at the ceiling, center of the space. Not in a corner, not on a shelf, not behind the TV. Ceiling-center radiates evenly to every part of the room.
- If the basement is large or L-shaped: two APs, one per zone, with ~20% coverage overlap for seamless roaming.
What doesn’t work
- A mesh node at the top of the basement stairs. It’s backhauling wirelessly through the same floor that’s killing the signal. The wireless backhaul problem is worst when the node has to punch through concrete.
- A Wi-Fi extender plugged into a basement outlet. Halves throughput on the band it receives on, and the signal it’s extending is already weak.
- Turning up the power on the main-floor AP. Higher transmit power helps the AP shout louder, but the client device (phone, laptop) can’t shout back any louder. You end up with an asymmetric link that looks connected but performs terribly.
The retrofit question
Running Cat6 from the main-floor network closet to the basement ceiling is often the easiest cable run in the house — straight down through a stud bay or chase. If the basement is already finished, the run can usually go through a closet or utility room on the main floor, down through the floor plate, and across the basement ceiling behind a soffit or through an interior wall.
The detached garage or shop
Why it’s hard
The garage is physically separate from the house. Wi-Fi from the house has to pass through exterior walls (often stucco, brick, or siding with foil-backed insulation) and cross open air. By the time the signal reaches the garage, it’s too weak for anything beyond basic web browsing — if it reaches at all.
Garage construction adds its own problems: metal doors (solid RF reflectors), concrete block walls, and no HVAC (meaning temperature extremes that affect both the gear and the people using it).
What works
- A dedicated AP inside the garage, wired back to the house. This is the only reliable answer. Everything else is a compromise.
- Cable path options:
- Underground conduit — the cleanest. Trench from the house to the garage, 18” deep minimum, 3/4” or 1” conduit, pull outdoor-rated Cat6A and/or fiber. Add a drip loop at each end.
- Aerial run on a messenger cable — acceptable for short spans (under ~50 feet). Use UV-rated cable and keep it above vehicle height.
- Through an attached wall — if the garage shares a wall with the house, a single core drill and a Cat6 pull is a 30-minute job.
- If the run is over ~80 meters (large lots in Herriman, Highland, Alpine, Heber), pull fiber instead of or alongside copper. Fiber doesn’t have the 100-meter Ethernet limit, is immune to lightning-induced surges between buildings, and is future-proof to speeds well beyond 10 Gbps.
What doesn’t work
- A mesh node in the garage backhauling wirelessly through two exterior walls and 30 feet of air. The signal might connect, but the throughput will be terrible and the connection will drop periodically.
- Powerline adapters — different electrical panels between house and garage mean the signal has to cross a breaker boundary. Performance is unpredictable at best, unusable at worst.
- A point-to-point wireless bridge — this works for line-of-sight links between buildings but is overkill for a 50-foot garage run and adds latency and complexity. For most residential scenarios, burying a cable is cheaper and more reliable.
Garage-specific considerations
- Mount the AP inside the garage, not outside pointing in. Metal garage doors block signal; an AP inside the building covers the interior and bleeds enough signal through windows and the man-door to cover the driveway.
- If the garage is unconditioned (no heat/AC), use an outdoor-rated AP even though it’s technically indoors. Temperature extremes in an unheated Utah garage can hit –10°F in winter and 110°F+ in summer.
- Add a camera drop while you’re pulling the AP cable. Same trench, same conduit, minimal added cost.
The ADU, guest house, or casita
Why it’s hard (and different from a garage)
ADUs are booming in Utah — Lehi, Saratoga Springs, Herriman, and Salt Lake City have all loosened ADU regulations in the last few years. An ADU is a separate living space, which means it needs full Wi-Fi coverage, not just “enough signal to check email.” Guests or tenants will stream, video-call, and connect a dozen devices.
It’s also a separate unit legally, which raises the network-isolation question: do you want the ADU on the same network as the main house, or segmented? For rental ADUs, the answer is almost always segmented — a tenant should not be on your home network.
What works
- Dedicated AP(s) in the ADU, wired back to the main house’s network closet via underground conduit (Cat6A + fiber, same as garage).
- Separate VLAN for the ADU — the AP broadcasts an ADU-specific SSID on its own VLAN, isolated from the main house network. The tenant gets internet but can’t see the main house’s cameras, locks, or devices.
- Bandwidth limits per VLAN if the ADU shares the main ISP connection. You probably don’t want a tenant’s torrent client saturating the link while you’re on a work call.
- For a high-end or long-term ADU: a separate ISP drop to the ADU itself, with its own modem and router. Fully independent. More expensive, but zero contention with the main house.
ADU-specific wiring
When the ADU is being built (or during the main-house remodel that adds it), this is the pre-wire checklist:
- Underground conduit from the main house rack to the ADU, with Cat6A + OS2 fiber pulled.
- 1–2 AP drops inside the ADU (ceiling mount).
- 1–2 camera drops for exterior coverage of the ADU entrance.
- Ethernet drops at the TV wall and desk location.
- A small 4–8 port PoE switch in the ADU (fed from the conduit run) to distribute locally.
The common thread: wire the AP, not the room
In all three scenarios — basement, garage, ADU — the pattern is the same: run one cable to a properly-placed ceiling AP, and let the AP cover the space wirelessly. You don’t need to wire every device; you need to wire the access point. One Cat6 run, one PoE-powered AP, and the problem is solved for good.
The cost of running one cable during construction or a basement finish is typically $100–200 in materials and 1–2 hours of labor. The cost of running it after drywall closes is $500–1,000. The cost of never running it — and living with bad Wi-Fi for a decade — is harder to put a number on, but it’s real.
Bottom line
Basements need a dedicated AP through the concrete floor. Detached garages need a cable in conduit, not a mesh node. ADUs need their own AP on a segmented VLAN. In all three cases, the fix is one cable and one AP — cheap during construction, expensive after, and the single biggest quality-of-life improvement you can make for spaces where people actually spend their time.
Keystone Integration plans and installs Wi-Fi coverage for basements, detached buildings, and ADUs across Riverton and the rest of the Wasatch Front. You can see the full list of what we do on our main site, or get in touch to scope coverage for your hardest-to-reach spaces.