Plumbers are expensive and should only be used when the job requires their skill set. A typical service charge can cost over $100, just for the visit alone without any service. In order to ensure that your job requires a plumber, make sure the pipes under the sink are properly tightened. Loose pipes can cause leaks and are easy to fix by simply tightening the connection. Furthermore, if the job requires a professional technician, make sure a plumber is the one to resolve the issue. Some machines, like dryers and dishwashers, require specialized technicians from the companies who produced them.