Hardwired Computer Network Cost - Fixr Additional rooms will cost 2-3 hours per room. However, each additional room does not need a new Ethernet 2 switch. To install Cat 6 cable 3 for 4 rooms in a home, the labor cost is between $195-$255 per room at minimum, or a total of $780-$1020 for the home.Back-up Generator · Electrical Wiring · Electrical Outlet · Cat-6 · Digital Phone · Home Automation How much to wire house with Ethernet cables? - Networking Jan 24, 2016I wired up 5 rooms in the house, running cable outside of the house. In total, it cost about £80 for the cable (external Cat6), backplates and RJ45 Cat6 faceplates. EDIT: We were having some work done on the house, so the holes and cable runs were done by professionals, then I wired up and installed the termination plates.