You need, at a minimum, a month to month lease for the room. If you want to make rules and the home and use, that would be a roommate agreement.Roommate (Room Rental) Agreement. A roommate agreement is a rental contract between the individuals living together that outlines the rules for the property. A roommate agreement is a legally binding document that you and whomever you share your living space with will sign. Roommate Agreement Template: Prevent disputes, ensure a smooth cohabitation, and foster a harmonious living space. What do I include in a Roommate Agreement? 2) This Agreement outlines the rights and responsibilities that the Roommates have in relation to each other. Below, you will find a collection of forms that cover various aspects of the application process, eligibility verification, and other important requirements. In general, Texas has very few official legal forms.