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How to Get Wi-Fi in a Detached Garage or ADU
Six methods to get real Wi-Fi in a detached garage or ADU, ranked by what actually works — with distance bands and the honest limits of each.
Published Sep 28, 2026
A detached garage, ADU, workshop, or pool house needs network for the same reason the main house does: cameras, sensors, a workspace, streaming. But it’s a separate building, often 50–200+ feet away, and the “solutions” that work inside a house mostly don’t work across a yard. Here are the six methods, ranked by what actually works in practice.
The ranking, shortest first
| # | Method | Best for | Honest speed |
|---|---|---|---|
| 1 | Buried Ethernet / fiber | Any distance, permanent solution | Full gigabit+ |
| 2 | MoCA over existing coax | Buildings with cable TV wiring | ~1–2.5 Gbps |
| 3 | Point-to-point wireless bridge | 50–200+ ft, clear line of sight | ~300–600 Mbps typical |
| 4 | Outdoor-rated access point | Under ~100 ft, mild wall obstruction | Varies, shares house AP capacity |
| 5 | Powerline adapter | Only if buildings share the same electrical panel | 50–400 Mbps, wildly inconsistent |
| 6 | Wi-Fi extender | Not recommended for detached buildings | — |
1. Buried Ethernet (or fiber): the permanent answer
If you’re trenching for anything — electrical, water, drainage — lay conduit and pull cable at the same time. The trench is 95% of the cost; the cable is almost free. Use outdoor-rated, gel-filled Cat6 or, better, pre-terminated fiber for lightning isolation between buildings (fiber doesn’t conduct, so a strike on one building can’t travel the cable to the other).
Cost: trenching is the variable ($500–2,000+ depending on distance and soil; a DIY narrow trench is a weekend of labor). Cable and fittings: under $100. This is the answer you want if the building matters to you long-term — an ADU someone lives in, a real workshop.
2. MoCA over coax: the sleeper option
If the detached building already has coax (cable TV) wiring that runs back to the house, MoCA 2.5 adapters give you a genuine ~2.5 Gbps wired link over that coax — no digging, no wireless. Check that the coax actually connects the buildings (trace it), and put a PoE (point-of-entry) filter where the cable line enters the property. Full details in our MoCA adapters guide.
3. Point-to-point wireless bridge: the wireless workhorse
Two directional radios — one on the house, one on the building, aimed at each other — create a dedicated wireless link. This is the method behind most successful detached-building networks, and it’s far more reliable than any extender or mesh “outdoor” node, because directional antennas concentrate the signal into a beam instead of spraying it everywhere.
What to expect by distance (these are rules of thumb from manufacturer range specs and community experience, not tested by us):
- 50 ft: nearly anything works, including a well-placed indoor AP near a window. A bridge is still the cleaner option.
- 100 ft: a bridge (e.g., TP-Link CPE510-class, ~$54.99 each, need two) is the sweet spot. Outdoor AP-to-outdoor AP can work too.
- 200+ ft: a bridge with clear line of sight; higher-gain units (Ubiquiti NanoStation-class, ~$181.72 for a pre-configured bundle) for longer or noisier paths.
Line of sight matters enormously: a tree, a metal roof, or a hill between the radios can halve throughput or kill the link. “Line of sight” means you can stand at one radio’s mounting point and see the other mounting point. See our wireless bridge comparison for the NanoStation vs CPE510 vs pre-configured kit decision.
4. Outdoor-rated access point
If the building is close (under ~100 ft) and mostly open between the house and the building, an outdoor AP mounted on the house’s exterior wall facing the building can cover it. This shares the AP’s capacity with everything else on that radio, and exterior walls (especially brick or stucco-over-wire-lath) attenuate heavily. It works for a camera and a phone; it’s marginal for a home office in the ADU. More in our outdoor Wi-Fi planning guide.
5. Powerline: only on the same panel
Powerline adapters send data over your electrical wiring. Between buildings this only works if both buildings are on the same electrical service panel — a sub-panel fed from the house counts; a separate meter/service does not. Even then, speeds are unpredictable (50–400 Mbps) and the link can drop when large motors (AC, pool pump, table saw) run. Fine for a couple of sensors; don’t run an ADU tenant’s work-from-home on it.
6. Wi-Fi extenders: why they’re wrong here
Extenders receive your house Wi-Fi and re-broadcast it. Across a yard, the extender’s backhaul signal is already weak, so it amplifies noise along with signal — and it halves your bandwidth on top of that. An extender placed inside a detached building has no good signal to extend. If an extender seems to “work,” it’s usually because the building is close enough that an outdoor AP (method 4) would work better. Skip extenders for detached buildings entirely.
Renter-friendly and no-drill options
If you can’t mount radios on the building (rental ADU, HOA restrictions, historic exterior):
- Window-mounted bridge: a bridge radio suction- or bracket-mounted inside a window facing the other building works surprisingly well — glass attenuates far less than walls. Low-E glass is the exception (its metallic coating reflects RF); test with your phone first.
- Indoor AP near the facing window: for buildings under ~75 ft, an indoor AP on a windowsill facing the building can be enough for light use. It’s inelegant and it works.
- Everything inside the building: keep all gear freestanding — bridge radio on a shelf, small switch/AP on a table. No holes, full network.
Decision flowchart
- Trenching for anything already? → Buried conduit + Ethernet/fiber. Done.
- Coax between buildings? → MoCA 2.5 adapters.
- Clear line of sight, 50–200+ ft? → Point-to-point bridge.
- Under ~100 ft, mild obstruction, light use? → Outdoor AP on the house.
- Same electrical panel, light use only? → Powerline as a stopgap.
- None of the above? → Reconsider: a bridge with a mast to get line of sight is cheaper than you’d think.
Cost comparison at a glance (estimates)
| Method | Typical cost | Effort |
|---|---|---|
| Buried Ethernet/fiber | $100 cable + $500–2,000+ trenching (or a weekend DIY) | High (one time) |
| MoCA over coax | ~$130–210 (adapters + filter) | Low |
| Point-to-point bridge | ~$110–180 (pair) | Medium (mount + aim) |
| Outdoor AP | ~$100–180 | Low–medium |
| Powerline | ~$60–100 (pair) | Low |
| Extender | ~$40–80 | Low (and not worth it) |
The pattern: the methods that work cost $100–200 in gear. The “cheap” method (extender) costs less and delivers nothing. Spend the $150 once.
What about a separate internet connection for the ADU?
Sometimes suggested: just get the ADU its own ISP line. The math rarely works — a second $60–80/mo connection is $720–960/year, every year, versus a one-time $110–180 bridge. The exceptions: a rental ADU where you want billing separation and liability isolation from your network, or a location where no backhaul method is feasible. For family use, bridge it.
Don’t forget the building’s interior
Getting signal to the building is half the job. Put an AP or small switch inside the detached building so devices connect locally instead of reaching back to the house. A bridge feeding a $30 AP inside the garage gives you a proper local network — cameras, openers, sensors all connect at full local speed, and only internet-bound traffic crosses the bridge.
What to buy (starting points, street prices are estimates)
- Point-to-point, DIY-friendly: two TP-Link CPE510 (~$54.99 each) — needs basic aiming and configuration. Amazon placeholder link
- Point-to-point, longer/noisier: Ubiquiti NanoStation bundle (~$181.72 for a pre-configured pair). Amazon placeholder link
- MoCA path: two MoCA 2.5 adapters (ScreenBeam/goCoax/Hitron class) — see the MoCA guide for the comparison.
- Outdoor AP path: see outdoor Wi-Fi planning.
Affiliate transparency note: we searched for public affiliate programs for Ubiquiti/UniFi and TP-Link and found none, so those products link via a generic Amazon placeholder for now. See our affiliate disclosure.