Electrical Outlets and Light Switch Wiring

Hi Marcel,
Here are my thoughts about what you have described about the wiring of your bathroom switches:
If the switch box is metal, and the switches have what is called a ground yoke or clip around the base of a mounting screw then this will create the necessary bond between the metal frame of the switch and the bonded ground wires in the box. This method must be correct otherwise a pigtailed ground wire should extend from the group of ground wires to each switch.
As for the ‘white’ wires: Keep in mind that white wires are not necessarily neutral wires. However, if a white wire is used for the hot or the circuit power wire then it must be identified with either black electrical tape or a permanent marker.
The way the switches are wired will depend on where the power originates, and then which of the wires are designated as switched legs back to each of the devices. Without my having the ability to test the actual circuit and component wiring I would not be able to fully comment about the rest of the wiring methods.
Finally, I will comment about your terminology: ‘the guy we got to do it’, simply to say that you should fully understand the capabilities and qualifications of the person who will be doing your electrical work. If the person is fully qualified then your job will be done correctly, if not then there may be problems. In my years of experience I have seen incredible mistakes with electrical wiring methods which were installed by unqualified individuals, and the sad result is that the wiring job ‘works’, however the incorrect wiring may in fact contain several violations that can lead to a host of potential problems. Just because ‘it works’ does not necessarily mean that it is ‘right’.
I hope this helps,
Dave