Hiring a professional licensed plumber to locate and repair a leaking water pipe hidden inside a finished wall typically costs between $300 and $1,000 in labor and plumbing materials, excluding drywall repair. The final cost depends on whether the plumber must cut open the drywall themselves, the type of pipe material (copper, PEX, or galvanized steel), and the complexity of accessing the pipe breach. Verification: Ensure the plumber pressure-tests the newly repaired pipe section thoroughly before closing up the access cavity.
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