Would be 24 or 26 for depth. I could go bigger but footings may go outside what I want to spend. The cars are malibu, rx7 and a ridgeline. As for as door size not really set in stone. I doubt I will have anything that would require a bigger door.
Looking to get a new garage built and have some sizes in mind. Max square footage I can go without footings is 850. So I have come up with 35x24 and 32x26. Will have 10ft side walls(2x6). 18x8 and 9x8 garage doors. Will have project car and 2 daily drivers parked in it. I also have shed for...