Replacing a bathtub overflow drain assembly typically costs between $20 and $50 in parts if you perform the repair yourself as a DIY project. If you hire a professional licensed plumber to replace the entire waste and overflow drain kit—including the faceplate, gasket, and connecting pipes—total labor and service call fees generally range from $200 to $450. Verification: Test the overflow drain by splashing water against the upper tub wall to confirm zero leaks.
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