Individual structural members, window and door frames are typically CNC'd off-site. Obviously the amount depends on what kind of build (eg. residential one-off,

Individual structural members, window and door frames are typically CNC'd off-site. Obviously the amount depends on what kind of build (eg. residential one-off, high vs. low spec, apartments, commercial, etc.) but in general for anything departing base-grade one-off small scale residential you will see more and more CNC'd elements.