Replacing a shower diverter cartridge as a DIY project typically costs between $25 and $60 for the replacement cartridge part purchased at a local hardware store, with labor costing zero. If you hire a professional licensed plumber to diagnose the issue and replace a faulty in-wall diverter cartridge, total service call and labor fees generally range from $175 to $350. Verification: Test the diverter handle after replacement to ensure smooth water redirection.
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