Ask for a suite with bedroom, bath, and hobby room. One more room won't make that much difference if the house is being built from ground up. LOL. In my DD's guest room I have room to sew in there when I visit but the sound of the machine can be heard before everyone is up in the morning. That's annoying to them. Maybe ask for soundproofing in the inside walls of your room. It will make a big difference to you too, not to hear the house noise. A solid bed room door will make a big difference in noise reduction too. Have fun decorating!