There are other options to give her "a tie to the house," but none are better than putting her name on the deed. For example, you could give her a lien against the house, but that creates many more problems for you than it solves. I don't know your whole situation, but it seems to me that if she is contributing money or time or work to build the house, she ought to have some legal ownership too. If you are wary, you could make a contract with her that says what happens if you split up. The contract could say, for example, that the person who stays pays rent to the person who moves out, and that the person who stays has an option to buy the other person's share of the house.
Answered on Jun 05th, 2013 at 8:02 PM