In the operating handbooks for GA aircraft, there are often weight and balance limitations listed for both Normal and Utiltity category operation. If I restrict the loading to the Utility category envelope, I want to know what regulations and prudence allow me to do over the Normal category envelope.

I am guessing that there are a set of regulatory certification standards for each category, as well as a list of specific restrictions for each type certificate. What are these definitions and where are they found?