Repairing a leaking pipe beneath a sink typically costs between $150 and $350 when hiring a professional licensed plumber, which covers diagnostic labor and basic parts like slip-joint washers or tailpieces. If you choose a DIY approach, parts generally cost under $15, making it an affordable fix if you have basic tools like a bucket, adjustable pliers, and replacement rubber gaskets. Verification: Inspect the under-sink connections with a dry paper towel after tightening or replacing parts to confirm zero moisture accumulation.
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