How do you get internet to a detached building?
Short answer: Run a buried Ethernet cable if the building is within about 328 feet (100 meters), or set up a point-to-point wireless link for longer distances when there is clear line of sight. Once the connection reaches the building, an access point inside provides Wi-Fi there.
Last checked October 26, 2026
Buried network cable
A copper network cable can carry a full-speed connection up to about 328 feet (100 meters) per run, the standard limit for Ethernet. It must be rated for outdoor or direct-burial use, and running it in conduit protects it and makes replacement easier.
Longer runs
Past about 328 feet, a single Ethernet run is out of spec. A powered switch partway along the route can start a new 328 foot run, but for most longer distances a point-to-point wireless link is the simpler option.
Point-to-point wireless
When trenching is not practical, a pair of radios mounted on each building can carry the network through the air. These links can span from a few hundred feet to several miles, but they need clear line of sight. Trees, hills and other buildings in the path are the main thing to check.
Wi-Fi inside the building
However the connection arrives, the building still needs its own access point for Wi-Fi, along with wired jacks for cameras, a TV or a workstation if needed. Metal buildings especially need the access point inside, because metal blocks Wi-Fi from outside.
Frequently asked questions
Can I just use a Wi-Fi extender?
Extenders rarely work well between buildings, especially metal ones. A dedicated wired or point-to-point link is more reliable.
How far can a network cable run?
Standard Ethernet supports runs up to about 328 feet (100 meters). Longer distances need a switch along the way or a point-to-point wireless link.
Do I need line of sight for a wireless link?
Yes. The radios on each end need a clear path with no trees, hills or buildings blocking it.
Sources
- IEEE 802.3 Ethernet standard: 100 meter twisted-pair channel limit