The cost to fix a shower diverter depends on whether the issue is fixed with basic maintenance or part replacement. If you clean and lubricate a stuck diverter spout yourself, parts cost under $10 for plumber's grease and vinegar. If you replace an entire tub spout diverter yourself, parts cost between $20 and $50. Hiring a professional plumber to diagnose and replace a faulty diverter spout or internal mixing diverter valve typically ranges from $150 to $350 including labor. Verification: Test the diverter after repair to confirm 100 percent water redirection to the showerhead.
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