Both Dale and I work, and the kids have school so our three are alone for a good portion of the day.
When they are pups they are crate trained, so that avoids problems in the most destructive puppy phase.
As adults (after 18 months) they do have the run of the house, and I have occaisionally come home to shredded kleenex, and once I woke up to an eaten couch. But those episodes are few and far between. They adjust to your schedule and sleep alot during the day, as long as you can provide exercise in the evenings, when you are home they will still sleep at night too. Give him a week and see how he is.
How was he at the other house when you were gone all day?
Stella