Will I be entitled to share in the profits of the sale of our home if so ordered in a possible divorce??

Your wife may not be correct.  The answer depends on the unique facts of each case.  Among other things, it will be important in your case to talk about how the addition was paid for, the principal balance of the mortgage at the time of the marriage, the current principal balance of the mortgage, and the source of the mortgage payments during the marriage.     I recommend that you meet as soon as possible with a very experienced lawyer who devotes his/her practice to New Jersey Divorce and Family Law matters, go over your situation in detail, get educated answers to your questions, and obtain expert guidance as to the best course of action. In my opinion, it will be well worth the cost of the meeting. I head a law firm that devotes its practice exclusively to New Jersey Divorce and Family Law matters.  It's all we do. Please feel free to take a look at our Firm Website (www.salvaggiolaw.net), which contains a lot of helpful information. Your question does not identify where you live.  My offices are in Morristown.  I would be happy to meet with you.  If you want to do that, please call 973-455-1220. David F. Salvaggio, Esq.