A professional licensed plumber typically charges between $125 and $250 total to replace a toilet fill valve, which includes standard service call fees, labor time, and the retail cost of a new universal fill valve part. If you choose to complete the repair yourself as a DIY project, a replacement fill valve costs $10 to $15 at any hardware store and takes about 15 minutes. Callout type="warning" title="Hygiene Warning": Shut off the water supply valve and drain the tank completely before replacing plumbing hardware. Verification: Refill the tank and test multiple flush cycles to confirm zero water leakage around the new valve base.
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