If your house is still under construction, always
run more than one wire, in fact it is cheaper to run 5 than it is to go back later and run another(especially in a multi-floor home). During construction a nail could go through one, when they put up the sheetrock they may sever a line while cutting out the wall boxes, etc. I have seen all sorts of things happen during construction, it is never a bad thing to have extra. I have been in the home A/V and automation business for nearly a decade and I have never thought having less wires was a good thing. In fact, I run all video over cat6 or shielded cat5 instead of HMDI, you can't run that through a switch(except with very expensive equipment). Switches are fine in moderation, but I wouldn't put one in every room, its bad design and it can create bottlenecks in your network. By all means, if you have an area where you need 8 devices connected, put in a switch(but still run more than one wire), but don't run a single wire everywhere and add switches to compensate. Also, do not daisy-chain several switches.
Originally Posted by bigbarney
You've heard from 3 different people now that your operation will be more efficient with a single line and a switch in each room. The commercial industry does it this way. I've done it (that includes alarm system and automation) and it works fine. But hey.... if you want to create a spaghetti mess of redundant and unnecessary cat5/6 cable all over your own house, then who am I to say you shouldn't.
I can guarantee you the commerical industry runs more than a single line, in fact I know because that is the environment I work in now, we pull 4 any time we need to pull 1.
I pulled 7 wires to each room of my house, and that was a retrofit; 3 cat6, 2 shielded cat5, coax and 22/4 for control. Anything not needed was left in the wall, and the "spagehetti mess" is contained in a 48" panel in the wall of my equipment closet, anytime I need another I pull one through and into the rack. In all, nearly 100 wires including speaker wire, cameras and security control.
To the OP, if a professional is doing the installation they should know better than to run a single line. If you are doing it youself, do yourself a favor and run at least 3 cat6, I can nearly guarantee someone will damage at least one during construction. I hope everything goes well for you, and keep us updated.