I work as a software dev for a company that does home automation systems [0] targeted at "high net worth individuals" (ie: people with large homes). Our product mainly goes into new custom built homes during the construction phase and we do everything hard wired. If you have the opportunity to go hard wired over wireless you'll thank yourself in the long run.
[0] http://www.idotechnology.com/products/saffyre-awareness-and-...