14ga wire is not "code" across the board in your area, or any area for that matter. The national electric code does not permit 14ga wiring for everything in a home. Specifically, your kitchen receptacles must be 20 amps and therefore must be fed with 12ga.
Although many people advocate it, there is not a requirement for 12ga wiring/20 amp circuits on general use receptacle circuits in bedrooms, living rooms, etc.
Your switches and receptacles are not "sized" for 14 gauge wire and not 12. If you're using the stabs in the back of the receptacles/switches, then 12 may not fit....But using the stabs is a crumby practice in many peoples' opinion (including mine).