Sam has knowledge of a few rooms that functionality could be drastically improved. Castiel recently mentioned the shooting range could use new equipment. He would also have some ideas for Dean on how to add luxuries without being impractical. All Dean needed to start with was his ideas and they could go from there.

If Lucy is involved, it might not end up bad. But sometimes the pair of them Sam does not know what to do with. They're trouble in the kitchen. Sam will deny that southern classic is a salad until it might hurt Lucy's feelings. "Stick to the green beans. How much syrup do you intend to make it with?" To be fair, health and home economics at the time only taught the four food groups; yams do fall under the vegetable category. Cleary with the displeasure he is showing, Sam is more concerned with the sugar ratio.