Remember this. He's had a taste of being ALONE and on his own. So he's coming home a changed person, somewhat. I think you will find that possibly any old habits that might have annoyed you in the past (dirty room, late nights, etc.) might be modified. Or not. But I DO think you will see/witness a higher level of respect from him as he matures. Is that possible? A higher level, not the maturity, I mean.

I can remember going back to Mother and Daddy's after I had left home. Although it was just for a visit, I couldn't get that "I live here, this is my space" feeling back no matter how hard I tried to realize it. So, I think you'll find that he might feel this as well and may act in a different way. Does that make sense? I'm not saying he was a bad kid before, I'm just saying that the experience of college AND living away from home, has surely changed him.

It all boils down to respect, if you ask me. Tell him what you expect. UP FRONT. Don't mix words and just lay it out there.