There are many plumbing services and the cost of a plumber’s service depends on the kind of job that they need to perform. A plumber in Johnston fee typically ranges from $100 to $725 for a usual job. Their average cost in a per hour basis ranges from $35 to $160. These amounts cover services like repairs on faucets, bathtubs, sinks and basic pipelines. A few Johnston plumbers though, may charge their client a flat rate depending on what sort of job they need to do.