Let me repeat that, plan you lighting before you start. Again - plan you lighting before you start. If your electrician wings it and makes mistakes it is almost impossible to fix.
For example high end lighting in a dining room might have:
1) chandelier
2) halogen cans over table
3) halogen cans around sides of room
4) art light aimable cans
5) cans over buffet furniture.
6) tray lighting in the ceiling
Do you really want six dimmers in the wall of the dining room? No. What you want to do is remote all of those dimmers and have a single keypad at each opening into the room. Remoting a dimmer means putting it down by the electrical panel or in an attic. The home automation feature of the keypads then controls the remote dimmers. Doing this at wiring install time is almost free.
Repeat this in each room of the house. Think about art lights, fireplace sconces, in-cabinet lights, switched outlets, in-floor outlets in the center of rooms. Plan all of this before you let your electrician start. If you plan all of this correctly you'll never end up with 8-gang rows of dimmers. Well designed lighting is an easy way to make a major improvement to the feel of the house.
Hide the thermostats in closets and use in-wall remote temperature sensors. Disable the temp sensor inside of the hidden thermostat.