Extending Wi-Fi to the garage, yard or a detached building

Start by measuring what you have

Before you buy anything, stand where the device will go (the garage door opener, a camera, a sprinkler controller) and check the signal on your phone with a Wi-Fi analyzer app, or look at the signal reading in your router app. If the signal is already weak at the wall of the house, any wireless repeater added there will pass on a weak link. Metal garage doors, concrete block walls, insulated walls with foil facing and brick all block signal. One manufacturer’s 2.4 GHz table puts a bearing wall at 20–25 dB and a concrete floor or ceiling at 15–25 dB of extra loss, and higher bands fade faster.

Also ask what the device needs. A smart garage opener or sensor needs a steady 2.4 GHz connection, not speed. A camera needs more upload capacity. A home office in a converted garage needs both.

Option 1: A mesh node in the garage

Fits: an attached garage or a building a short distance away with a clear path. Cost: $80–$170 per extra node. Limits: the node needs a strong signal from the rest of the system. Place it on the house side of the garage, where it still reads a strong link, not in the farthest corner. Ethernet between the node and the main unit keeps full speed. See mesh vs range extender for how the units compare, and the nodes calculator if you are also covering the house.

Option 2: An outdoor access point on Ethernet

Fits: garages, patios and yards where you can run a cable. Cost: $80–$250 for an outdoor-rated access point, plus cable. How it works: an access point connects to the router by Ethernet, so signal strength from the house stops mattering. Many outdoor access points get power through the cable (Power over Ethernet, or PoE) from a PoE switch or injector inside the house, so no outlet is needed outside. Choose a model rated for outdoor use (weather-resistant housing and a temperature range for your climate).

Option 3: Buried Ethernet to a detached building

Fits: a detached garage, workshop or guest house you plan to use for years. Cost: $50–$300 in materials for a DIY run, much more if you hire a trench. Limit: Ethernet over twisted pair reaches 328 feet (100 meters) per cable segment, a figure TechTarget gives for 1000BASE-T; beyond that you need a switch or a fiber link.

• Use cable sold as outdoor direct-burial, or put standard cable in conduit. Indoor cable breaks down in soil and sunlight.
• Call 811 a few business days before you dig. It is the free national service that has buried utility lines marked.
• Keep data cable well apart from power cable, and do not put low-voltage and line-voltage wiring in the same conduit. If your trench also carries power to the building, follow local code and hire a licensed electrician if you are unsure.
• Add a surge protector at both ends. Lightning can travel along an outdoor cable and damage the router or switch.

At the far end, put an access point (or a mesh node with Ethernet in) in the building.

Option 4: A point-to-point wireless bridge

Fits: a building across a lawn where trenching is not an option. Cost: $100–$300 for a pair. How it works: two outdoor units face each other and create a wireless “cable” between buildings. They need a clear line of sight: trees, walls and vehicles in the path reduce the link, and a shop that sells bridges points out that light obstacles can pass a short link but a long link (250 meters and up) needs an absolutely clear path. The 5 GHz band is the usual choice because it has more channels and less interference. Mount the units high and aim them carefully, and add an access point on the far side.

Option 5: Powerline adapters

Fits: an attached garage on the same electrical panel. Cost: $40–$120 for a pair. Limits: adapters send the network signal through your wiring. A garage on a separate subpanel, an old wiring system, GFCI/AFCI breakers, surge strips and noisy devices (a freezer, a power tool charger) can cut speed or break the link. Plug adapters directly into a wall outlet, not a power strip. Treat this as a try-it option: cheap, with an easy return.

Which one to choose

Power and safety outside

Outdoor devices need power too. If you use an extension cord, the CPSC says to use only cords labeled for outdoor use, and to use extension cords only temporarily and not to overload them. Permanent outdoor outlets should be installed by a licensed electrician following local code, on a GFCI-protected circuit. Do not run cables across driveways or lawns where they can be damaged. If you rent or live in an HOA community, check your lease or rules before drilling or burying anything. For battery or solar cameras and sensors that only need an occasional connection, a cellular option may be easier than extending Wi-Fi; see remote monitoring without internet.