I'm not sure, was that info also on the Architectural drawings that's filed with the Town of Milton for your home? You can get a copy of that but you have to pay around $90 I think. Look at this thread for more info...
http://www.hawthornevillager.com/phpbb/viewtopic.php?p=6085
This might be different than the electrical plans maybe that Mattamy might give you.
We didn't pay close attention to the locations of light switches in our new home before closing. I wish we had though, because there is one light switch which is in a bad location. But later on we'll have an electrician just move it for us.. it's on our list of eventual-things-to-do.
For Bell & Cable though, during your structural appointment (or is it design?) they ask you where you want it and they mark it on the floor plan and give you a copy. At least that's how it went for us. So the eventual floor plans they gave back to us had (in pen) marks for where we wanted the phone/cable outlets to go.