I'm planning to build a 30x60 shop, and later a House.
We are looking for land currently, and where we are looking there is a lot of Granite outcroppings.
For so many reasons, we are going with ICF... Insulated Concrete Form walls.
Insulation, strength, and I think I can do most of it myself.
Snow load, hurricanes, earthquakes... wont even blink.
Used to be 20% more to build, but now with Lumber as crazy as it is Im hearing its so close its not even worth considering stick built.
This might help you understand ICF, if you are not familiar, and how to do it on rock..
And this is Part2
In your case, Id wait until its cured, then backfill and compact, then pour a floating floor, with PEX heating pipes too... so cheap to put it in at the time, then you can then add the heating later...
Hope that helps!
First time I saw it I was like WTF... I can do that!