The average cost to fix a leaking plumbing pipe typically ranges from $150 to $450 when hiring a professional licensed plumber for straightforward accessible repairs under a sink or in a basement. However, if the leaking pipe is hidden behind finished walls, beneath concrete slabs, or requires major main line excavation, repair costs can escalate significantly from $500 to $3,000+ including drywall restoration and repiping. Verification: Inspect the repair area with a dry paper towel to confirm zero moisture accumulation.
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