Some of my tenants have offered to do home repairs. One of them installed electric lights in my house and I never knew this until later. This person has also offered to do some other repairs and improvements around the house for me. I think I should get agreements in writing. I also think I should check out their credentials. What would be a safe and legal protocol for tenents who offer to do home imprivements? I don't always think you should just take them at their word.