paul g wrote:powerline adapters are another option.
Agreed but with caution. My house is wired with 3 phase electricity. I have found them a bit unreliable in that situation even though I made sure both sockets were on the same phase. The problem was pauses when streaming TV through a MAG box.
My original adapters worked quite well, with the odd pause, until one finally gave up the ghost. I moved the router so it was only about 4 m from the MAG box and connected with WiFi but got lots of pauses.
I bought a new pair of powerline adapters, which were higher speed, and they would not work at all. I got a 90 % refund, since they were found to be fully working by the vendor, and managed to find a pair of slow speed ones. Again those worked but with more pauses than the original pair so I switched to a 5 m Ethernet cable routed in plastic cable trunking stuck to the wall. No problems at all.
When I moved the router I used a desktop USB WiFi adapter to connect my PC to the router. Despite placing the adapter less than 1 m from the router, admittedly through a wall, it never felt smooth so I drilled a hole in the wall and used Ethernet again. Now the gods of the internet are in their heaven and all is well in the world.