Yeah - I have had this repeatedly as I tend to live in old stone houses with meter thick walls.

I’ve found powerline networking to work surprisingly well - over a hundred megabits on a crufty 70 year old power install, and I just jam them strategically in rooms that are separated by a thick wall.

At home, I throw regular 802.11n half a kilometer through empty air with a yagi, but that’s a different story entirely.