You could ask for a chain or a dead bolt that you can keep locked when your home. They are not accessible from the outside. That would give you additional privacy and time to answer the door before they enter. I'm hearing impaired and the flashing door light was in the bedroom so if I was else where I didn't see it. The maintenance workers would knock extra loud but sometimes tried to open the door before I noticed them but the dead bolt would stop them. I always keep all locks on when I'm at home.