No, it's sitting on ground-contact landscape timbers, which were set on cement pavers set in gravel.
I haven't decided how to block off access to critters....or whether to bother to try. Chipmunks have already started to dig nearby.
I did take advantage of the space underneath to dispose of the small rocks I've dug up over the years, one to get rid of my rock pile, and two because I thought that a rocky surface might deter critter excavations.
I wouldn't really mind all that much if critters took up residence, though. I don't have a dog, and my cat only goes outside on a leash or in a cat tent, so I wouldn't have to worry about pet-wildlife conflicts. Besides, the fox pups at Donner's house were so darn cute!!
Here's how far we got today....There will be windows on each side to let in light.