Get the Ununsed Room RenterReady. Determine which room you want to rent out and then prepare it for a future renter.Follow the steps on how to rent out a room properly from start to finish, and you will have a much more successful experience. Boyce Thompson shows how your new house could earn rental income, in Time To Build on Houseplans. Com: 1-800-913-2350. Texas law allows landlords to collect "reasonable" late fees if any portion of the rent remains unpaid more than two full days after it was due. Chapter 1: Administration and General Requirements1. All single-family houses and duplexes are required to be registered annually. It's best not to apply unless you are pretty sure that you want to rent the apartment.