It’s hard to tell, but based on the first pic in the OP; what is now the left is the right. It appears if they dug 16” footer trenches, poured flush, two rows of 8” block, plus half the L block (4”) you’d be at 36” footer depth. Which depending on they’re requirements would be fine. It all depends on what is required locally. It’s also possible, with the insulated slab, they they will pour the slab, then set another course or two of block for raise the wall height up more.
But again, it’s clearly a house in a development, so it’s all properly permitted and designed and built
I usually plan on at least 8" of space between the wood of the structure and grade. Their concrete will most likely be flush with the top of the shoe block and the plate will be right on top if the shoe block/slab. Even assuming the footer was 16" thick, which I doubt because concrete block are less expensive than solid concrete, the math doesn't work at the far end at the garage door opening there will be inadequate depth of footer. This is a bad area because there will be no snow to help the frost from being driven into the ground there. I believe their only option would be to insulate the exterior of the foundation not just next to the wall, but away from the building as they do "up north". Speaking of insulation, is that bead board shown and is it allowed "underground" in this area? I have always used closed cell insulation an in Formular or Styrofoam against the ground as it will not hold water. I would like to see the plans and notes....
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