Replacing an existing under-sink garbage disposal typically costs between $250 and $600 for total equipment and professional plumbing labor, though high-end horsepower models can increase expenses. The final cost depends heavily on whether the replacement requires modifying under-sink PVC drain plumbing or electrical wiring connections. If you choose a DIY approach, purchasing a standard 1/2-horsepower disposal unit costs around $100 to $200. Verification: Check under the sink for leaks and test disposal operation using cold water.
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