The cost to fix a leaking bathtub overflow pipe depends on the source of the leak. If the leak is caused by a worn-out rubber overflow gasket, replacing the gasket yourself costs under $10 in parts, while hiring a plumber costs $150 to $250. If the overflow pipe itself is cracked behind the wall requiring professional pipe replacement and wall patching, total costs can range from $350 to $700+. Verification: Inspect the repair area during a test bath to confirm zero moisture is present.
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