Adding CAT5 cables to each room?

I noticed a lot of 2002+ built houses have this built in, but I am buying an older town house and was wondering if its possible to pay someone to add some sort of network connections to rooms without draggin the wire accross the floor, id rather it be like CABLE tv how that is set up.

Many new home do offer this as an option and if you are lucky they will also include it. The good thing though is that phone line are now run on cat5/cat6 systems. This is good because you can use the extra pairs to tap in for the internet then usually you will not have wire the extra cat5.