What type of lighting is in your plans and contract? If the contractor screwed up, let him know right away so he can stop the work and get it fixed on his dime. If nothing is specific in the contract about what type of lights you want, then it's your fault for not keeping in contact with the contractor and spelling out the lighting desires.

Either way have him stop the work ASAP so nothing more gets spent until it gets fixed. Yes you may have to pay out, and at that point you will need to decide how much it is worth to you to have it the way you wanted it.

Maybe it's possible to just switch out the fixtures from wafer to flush mount? Not sure what the wiring difference would be for each type of fixture.

And go to your site as much as possible as they work to make sure things are going as planned!

Josie, thanks so much! We actually did not have a lighting plan. However, every other room in our house has a centered flush mount fixture. We assumed this was the default and that we would have been contacted about variations. I was obviously wrong to assume! :(

I was hoping to we could pop a flush mount where the wafer lights are, but there are 3-4 wafer lights per room. I think this means that they are not centered. And of course, plaster wrapped up yesterday!

I would love to get a sense of what it would take to reverse this sort of work so that I can talk to our contractor from a more educated place on Monday.

I really appreciate your thoughts!

By "wafer lights" I assume you're referring to shallow recessed lights. I think you're lucky. The lighting in the laundry room and closet doesn't matter. The study will need additional task lighting and the sitting room will need table or floor lamps anyway. I'd leave it alone. Just make sure the lights are dimmable and that they're controlled by dimmers.