It will be loud, but I'm guessing you run a shop so loud should not be a problem. That said Insulation in the office wall might be nice but if you did not need it before for your shop you should not need it now.
Whatever you do make sure to watch your cnc, they can start on fire very fast and even faster with a vac pump.
Kyle Stapleton
River Falls Renaissance Academy
Math/Technology Education Teacher
PRS Alpha 96x60 2.2 hp spindle, Double Air drills, 6" indexer, Fein 5 zone vac table
Desktop w/spindle
Potter Pen
Aspire 8.5, Creo 3.0