Regardless, new or old const. to leave open empty spaces and put in a sub panel is (once again A Joke) and a rip off, wouldn't last to long around here. I did new const for many years from track homes to multi millon $ custom homes and it would have never flew but that is around here if it works for you so be it. But dont be surprised when you get under cut by another ec on the next job due to word of mouth about cost. every home owner somehow knows somebody, who Claims (LOL) to know something about electric. and thats how it all starts.
