When I did home daycare, including subbing in others' daycares, I didn't open the blinds, unlock the door (even if that meant locking it behind me) until the official opening time. Now that I work in a large centre, the same applies. The door is unlocked at 7:00. If you go to a store that says it opens at 10 - do you expect them to let you in at 9:55? Just because you may be working out of your home, doesn't mean you always have to be available. It is a business and people need to respect that.