How many floors do you put into most of your home builds?

I put one... but really it's 1-2 stories. I like one story homes mostly because of toddlers and kitten/puppies. To keep a toddler happy/fed/from being taken away it's just easier to have one story. Plus it's painful to watch them climb and descend the stairs. Also, kittens and puppies can't climb stairs (at least I haven't been able to get them to.)