Refer to posting #4.There are a few options. I would start by cutting a square hole along one of the studs of the lower 1 ft of the side wall. Use a stud locator from a hardware store. Cut the square about the size of an electrical box. Use a good LED flashlight to take a look at what you have for insulation. If it’s empty in there you can go with foam or you can go with batts. If you go with batts you would the cut the drywall away from the floor to where the roofline intersects the outside of the wall. Then stuff the entire volume with fibreglass batts and staple plastic over top and chalk the seams before replacing the drywall.
If you see plywood when you remove the square of drywall, you need to cut a hole in that plywood and see if there is insulation in the cavity. Foam sounds like a good way to get that floor area outside the wall insulated. Also if the plywood is there you can finish off by foaming the cavity between the dry wall and the plywood.
If there was no plywood, you could make hole like the first one beside each stud, purchase a foam kit and lay in 3 inches of foam on the floor outside the wall and along the inside of the roof line right to the end where the roof meets the floor.
It would be worthwhile to check the header area beneath the floor. That header needs to be insulated but would require cutting a hole on the garage ceiling to inspect it.
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. Obviously prices vary by region and quantity, but smells like at least $1k for a garage floor and walls. (Then you have to replace the drywall in your office walls and the garage ceiling. Price of rigid insulation, like lumber is stupid high now, if looking at more than a couple sheets, definitely want to check with a building supply place versus HD or Lowes.
