Getting the internet to a shed, studio or second building: the wireless bridge

The internet is fine in the house. The shed, the studio, the workshop or the pool house at the back gets nothing, the extender in the back window has not helped, and between the two buildings is a concrete driveway nobody wants to cut up. A point-to-point wireless bridge is the usual answer when a trench is not practical, and it is one of the jobs on our data cabling to a second building, by cable or bridge page. Here is how it works, what it needs, when it does not work, and how it compares with a cable, mesh and a separate 5G service.

What is a point-to-point wireless bridge?

A point-to-point wireless bridge is a pair of small outdoor radio units, one mounted on each building and aimed at each other, that carries your home network across the gap. The unit on the house is cabled to your router. The unit on the shed is cabled to a router or WiFi access point inside it. Between them, the pair does the job of a cable through the air.

Think of two little dishes that face each other, because that is what they look like. They are not mesh. A mesh unit talks to the router over WiFi; a bridge unit is wired to it, and the wireless part is only the link between the two buildings. Done properly, what you get at the router in the house is what you get in the shed.

The bridge shares the house’s internet. There is still one service and one bill, and the outbuilding gets its own WiFi name and password from its own router. It does not need to go on the roof either: if the two buildings are on the same level and can see each other, the units can go on the walls facing each other.

What does a wireless bridge need to work?

A wireless bridge needs six things: a clear line of sight between the units, a cable from each unit back to a router or access point, power for each unit over that cable, a power point in both buildings, a router or access point in the outbuilding to make the WiFi, and setting up and aiming. A kit is not working until all six are in place.

1. 1

   A clear line of sight

   From the spot on the house wall to the spot on the shed, with nothing in between. Stand at one and look at the other.

2. 2

   A cable from the router to the outside wall

   The units are outdoor units, so a network cable has to run from the router inside to where the house unit mounts, and the same at the shed end.

3. 3

   Power over the cable

   Each unit is powered through its network cable by a small power over ethernet injector, usually called a PoE injector, plugged in beside the router. A network switch with power on its ports does the same job.

4. 4

   Power in the outbuilding

   The far end needs a power point for its injector and for the router. Where the far end is a gate, a pump or a pole rather than a room, that means a weatherproof outlet.

5. 5

   A router or access point at the far end

   The bridge brings the network across; something in the outbuilding has to turn it into WiFi. If the thing out there only needs a cable, such as a computer or a camera recorder, it can plug straight in.

6. 6

   Pairing and aiming

   The two units are set up in software to talk to each other, then aimed and fine-tuned until the signal between them peaks.

The maker’s guides say the same. TP-Link’s installation guide for its outdoor units powers them through a passive PoE adapter over the network cable, asks for a clear line of sight and an elevated position, and says proper grounding is extremely important for outdoor equipment. That last point is a reason this is an installation, not a plug-in gadget.

These are outdoor units of the kind a bridge is built from. Each CPE comes with its own power injector.

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Gear mentioned here, on Amazon Australia

Product	What it is for	Link
TP-Link CPE510	Outdoor 5GHz bridge unit	View on Amazon for the TP-Link CPE510 (opens in a new tab)
TP-Link CPE210	Outdoor 2.4GHz bridge unit	View on Amazon for the TP-Link CPE210 (opens in a new tab)

How far can a wireless bridge reach?

Further than most people expect, as long as the two units can see each other. One of our own jobs carried internet from the shore of Woronora Dam to offices on two pontoons out on the water, for the Department of Defence: one pair of radios from the shore to the first pontoon, and a second pair from that pontoon to the next. The speed test on the barge read the same as on shore.

Water and open ground are easy. Trees, hills and buildings in the way are what stop a bridge, not the distance itself.

When does a wireless bridge not work?

A wireless bridge does not work well when something is in the way. Trees, a roofline, a hill, a water tank or another building between the two units weakens the link or stops it, and trees keep growing after the units go up.

A clear view from one unit to the other is not quite enough. TP-Link’s guidance on outdoor links points out that a visual line of sight is not the same as clearance for the radio signal, which needs the space around the straight line to be mostly clear as well, and its guide to long-distance outdoor links (opens in a new tab) says to mount outdoor units as high as possible to avoid obstacles. In a backyard the fix is usually height: a short mast or a higher bracket on the shed gets over a fence, a car or a hedge.

Pick what is between the buildings

Clear view A tree in the way Mounted higher

House unit House unit Shed unit Shed unit Router Router Power Power

The space the signal needs

Clear view

Nothing between the two units and the space around the line is clear. The bridge carries what the house has, out to the shed.

A tree in the way

A tree, a roofline or another building in the way weakens the link or stops it. Seeing the other unit is not quite enough: the space around the line needs to be clear too.

Mounted higher

Height is the usual fix in a backyard. A short mast or a higher bracket on each building can lift the link over a fence, a car or a hedge.

The other ways a bridge disappoints have nothing to do with the radio:

• No power at the far end. A shed with no power point needs an electrician before anything else.
• No router at the far end. The bridge works, but nothing in the shed makes WiFi.
• The house’s own internet is the problem. A bridge carries what the house has. If the connection is slow or dropping out, it will be slow or drop out in the shed too.
• Something changed at the house. When the internet source changes, a new modem or a Starlink router for example, our technician’s advice is to get the new connection working on its own first and plug the bridge back in after, so it picks up the new router properly.

Wireless bridge or a cable in conduit?

A cable in conduit is the better answer wherever you can dig. It is permanent, there is nothing to aim or power at the far end except the router, and trees and weather do not affect it. A bridge wins where a trench is impractical: across concrete, paving, a driveway or a retaining wall.

Our technician’s rule of thumb is simple. Grass between two buildings that are close together: dig in a cable, it is the cheapest and most permanent way. Concrete or paving in between: a bridge, because it is usually simpler and cheaper than cutting and patching the concrete.

The cable that goes in the ground has to be rated for it. That means gel-filled underground ethernet cable in conduit, a socket at each end and a router in the outbuilding. The blue cable used inside walls is not made for it: conduit always takes in water eventually, and internal cable in a wet pipe fails within a few years. One customer’s cable to a guest cottage had worked for years and then stopped, and the cable in the ground was blue internal cable: the first thing to test. If the conduit is already in, the job is much simpler; and if a trench is going in for power or water anyway, put a conduit in for data while it is open.

Distance matters too. A copper network cable is made for runs of up to 100 metres, TP-Link’s own figure. Past that, the choice is fibre in conduit or a bridge, and on a big rural block a bridge is often the quicker of the two because nothing is dug. One more option sometimes fits: a cable strung overhead between the two buildings on a catenary wire, where there is a clear span and no trench.

Getting the internet to a second building: the options compared

Option	Best when	Watch for
Cable in conduit	You can dig, and the ground is grass or garden	Must be underground-rated, gel-filled cable; concrete adds cutting and patching
Wireless bridge	Concrete, paving or a driveway in between, a long distance, or you rent	Needs a clear line of sight, power at both ends and a router at the far end
Mesh in the windows	The buildings are close and the windows face each other	Distance and brick end it quickly; slower than a cable or a bridge
Its own 5G service	The outbuilding is used by someone else, or the house's internet is the problem	A second bill, and it depends on 5G coverage at that spot

If you rent, a bridge has one more advantage our technician points out: the units come down and go with you when you move. A cable in the ground stays with the house.

Wireless bridge or mesh?

Mesh can reach a building that is close, and it is worth trying before a bridge if the buildings face each other. Put one mesh unit in a window of the house that looks at a window of the outbuilding, and the next unit in that window, so the hop between buildings is through glass rather than brick.

The limits are distance and walls. Our technician’s view is that around 20 metres is the edge for mesh between buildings: it might connect, and it might not, and it may need a unit at the halfway point. A bridge is built for the gap; mesh is built for inside a house. Plain WiFi extenders are a poorer bet again, because they repeat a signal that is already weak by the time it reaches the back window, which is why WiFi range extenders rarely reach a second building. If mesh is the plan, the best mesh WiFi for Australian homes covers choosing one.

Powerline adapters, which send the network through the power wiring, are another thing people try. Our technician’s experience is that they do not work well to a separate building, which is usually on a different power circuit from the room with the router.

Should the outbuilding just have its own 5G service?

Sometimes, yes. A 5G home internet plan with its own router and SIM gives the outbuilding its own connection, with no cable, no bridge and no dependence on the house. It suits a studio rented to someone else, a shed that needs its own account, or a granny flat where the main house’s internet is the actual problem.

It depends on 5G coverage at that exact spot, and it is a second bill. Our technician also points out the upside for renters: the router goes with you. Starlink vs 5G vs NBN compares the three for a home, and the same questions apply to a shed.

What about an outdoor WiFi access point?

An outdoor WiFi access point is a different job from a bridge. A bridge links two buildings; an outdoor access point puts WiFi over an area, the yard, the pool, a deck or a work area, for phones and laptops used outside.

It is mounted outside, high up, and fed by a network cable from the router that also powers it, the same power over ethernet idea as a bridge unit. A home can need both: a bridge to the shed, and an access point on the shed for the yard around it.

For WiFi in the yard or around the outbuilding, these are weatherproof units. The EAP225-Outdoor runs off an 802.3af PoE injector like the TL-PoE150S.

Gear mentioned here, on Amazon Australia

Product	What it is for	Link
TP-Link EAP225-Outdoor	Weatherproof access point	View on Amazon for the TP-Link EAP225-Outdoor (opens in a new tab)
TP-Link Deco X50-Outdoor	Weatherproof Deco mesh unit	View on Amazon for the TP-Link Deco X50-Outdoor (opens in a new tab)
TP-Link TL-PoE150S	802.3af PoE injector	View on Amazon for the TP-Link TL-PoE150S (opens in a new tab)

What if it is a granny flat?

A granny flat has one more choice: its own NBN service, once the council has registered its address. Until then, or instead, it shares the house’s service over a cable or a bridge in the same way as a shed. Our guide to granny flat NBN covers the address and the separate service, and sharing the main house’s NBN with a granny flat shows the cable version on a real job.

The NBN box itself stays in the house. It has to be inside and dry, so a shed or a patio is not the place for it; the outbuilding gets its connection by a cable, a bridge or mesh from the box in the house. If the box is in the wrong part of the house to start with, that is moving the NBN box.

When to call a technician, and when you don’t need one

You do not need us to try mesh in the windows, and you do not need us to order a 5G service for the outbuilding: both are yours to try first. If the buildings are close and the windows face each other, try that before anything is mounted on a wall.

Call us when it needs cabling or a bridge:

• A cable in the ground between the buildings, underground-rated, with a socket at each end. That is data cabling, and it is the first question on any second-building quote.
• A wireless bridge where the yard cannot be dug: the cables to each unit, the mounting, the power, the pairing and the aiming. We can supply the pair or set up one you have already bought. A WiFi technician also covers the router or access point at the far end.
• An old cable to a cottage or studio that has stopped working. We test it first, before anything is replaced.

Walk out the distance between the two buildings in steps, take photos from each end looking at the other, and send them to us through the contact page. That is usually enough for us to say whether it is a cable or a bridge, and to quote it.