Ya, floor drains are no-go.
You may want to consider a motion sensor light switch instead of switches. Should come on when you open the big door, which is nice.
I put in 2 50A 220v circuits for electric car chargers. Sure I don't have one, and it may be awhile but it didn't cost me much(about $250) and figure easier now than later. Plus I can use 'em for a welder in the mean time!
20A circuits in a few spots are a good idea too. If you don't go with a 50A, I'd still run a 20A near the car becuase plug in hybrids can use them.
These openers cost a bit more, but are way better than your standard opener, and if the builder is installing, might even save labour costs as they go in easier. The nice part is you don't have overhead gear so you can use that area easier for storage. I love mine, and most of the cheaper stuff is garbage anyway that will break in 2 years, so get something good to start with. You will need an electrical outlet to one side for it.
https://www.amazon.ca/LiftMaster-850.../dp/B00EOWAMVM