When you move into a house or apartment, you can never be sure who else might have a key to your house. Even if the former tenants are trustworthy, they probably lent a spare key to a family member or a neighbor. These spare keys could be hanging on a hook in the neighbor’s kitchen, conveniently labeled with your address. Former house sitters, cleaning services, babysitters, or others may have keys to your home. Even if your home is brand new, the contractors and real estate agents all had access to the key. When renting an apartment or condo, speak with a landlord to ensure the locks were changed between tenants.