Fixing high water pressure in a house typically costs between $250 and $600, depending on whether you can simply adjust your existing pressure reducing valve (PRV) or if the valve requires full replacement. If your PRV is fully functional, a professional plumber may charge a basic service fee (around $150 to $250) or adjust it for free during a visit. However, if the internal diaphragm is shot and requires a brand-new PRV installation, equipment and professional labor combined will range between $350 and $600. Verification: Attach a pressure gauge to an outdoor spigot after service to confirm your PSI drops to a safe 50 to 60 range.
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