Hiring a professional licensed plumber to install water hammer arrestors typically costs between $150 and $400 total, combining hourly labor rates (ranging from $150 to $350 per hour) and the price of the hardware units. The final cost varies depending on accessibility; screwing arrestors onto washing machine valves or under-sink stops takes minutes and costs less, whereas cutting into finished drywall to install inline arrestors for showers or tubs will increase labor and drywall repair expenses. Verification: Test all plumbing fixtures post-installation to verify the complete elimination of pipe banging.
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