Whether you or your condo manager is the one looking for a contractor, be sure the plumber can show a valid license. Legitimate licenses will not only guarantee professional services, it will also provide affirmation that the person coming into your building and into the home of your tenants to fix plumbing issues is not a threat to the security of you and your tenant’s property. The licensure also serves as an insurance that will cover the expenses in case of any damage that the plumber has caused during their service.