The cost to repair a bathtub overflow depends on the specific component that has failed. Replacing just a worn rubber overflow gasket or a corroded faceplate as a DIY project costs under $15 in parts. If you hire a professional licensed plumber to replace the entire waste and overflow drain assembly behind the tub wall, total labor and service call fees typically range from $250 to $500. Verification: Pour a bucket of water down the overflow opening after repair to verify zero leaks behind the wall.
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