Hello everyone,
I am an electronics technician and I have wired my current house like this.
Duplex network cable Cat 7 from the basement to every room, duplex cable because you are more flexible, for example you can move your router and send a signal back! Never lay just 1 cable, always duplex.
Install a patch panel in the basement, you can do it yourself with a little craft skill.
The cabling should be centralized from every room to the basement, in your case to the HTR room.
If I were building new, every room would have at least one network outlet with 2 connection options on each side, maybe because of my profession. Additionally, I would place a network outlet in the hallway on each floor for an access point.
Costs:
Tool: LSA Plus approx. 25 euros
Network cable: 100 meter roll Duplex Cat 7 approx. 100 euros
Network outlet: Depending on the system approx. 10 euros per outlet.
This information is, if you want to do it yourself, my personal assessment. A professional or electrician will cost you many times more, it simply depends on whether you would trust yourself to do something like this?!
Regards