Fixing an under-sink leak as a DIY project typically costs between $5 and $20 in parts for replacement rubber slip-joint washers, Teflon tape, or plumber's putty. If you hire a professional licensed plumber to diagnose and repair the under-sink leak, total service call and labor fees generally range from $150 to $300, depending on whether entire tailpieces, P-traps, or sink strainer assemblies need to be replaced. Verification: Run the faucet after repair and place a dry paper towel beneath the cabinet to confirm zero leaks.
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