Fill Valve Replacement
Knoxville, Tennessee
A fill valve (also called a ballcock) controls the water that refills the toilet tank after flushing. When it fails, the toilet may run continuously, fill slowly, or not fill at all. Fill valve replacement is a common and relatively inexpensive repair.
Typical Installed Project Cost
Typical Installed Project Cost in the Knoxville Area
These general market estimates are intended to reflect pricing from an established professional plumbing contractor and typically include standard equipment/materials and professional installation for a reasonably straightforward project.
Typical Low
$155
Straightforward installation with standard equipment
Typical Mid-Range
$225
A commonly seen range for a typical installation
Typical High
$325
Complex installation, premium equipment, or additional work
Actual project cost can vary based on equipment selection, existing conditions, accessibility, code requirements, permits, additional plumbing modifications, electrical or gas work, excavation, restoration, and other project-specific factors. These are general Knoxville-area professional-contractor market estimates for educational purposes, not handyman, side-job, or unlicensed pricing, and are not a quote or pricing from The Classic Plumber.
Market estimate — not a Classic Plumber quote.
A typical professional fill valve replacement may include:
- ✓Removing the old fill valve
- ✓Installing the new fill valve
- ✓Adjusting the water level
- ✓Testing proper fill and shut-off
Additional repairs, code upgrades, or modifications can increase the total cost beyond what's listed above.
Several factors can move the cost up or down from the typical range:
Before Calling a Plumber…
A few safe, simple checks may save you a service call:
- ✓Check whether the water level in the tank is above the overflow tube — if so, the fill valve may need adjustment or replacement
Many Knoxville homes have older toilets that use 3.5 gallons per flush or more. Replacing with a modern 1.28-gpf toilet can reduce water bills. In older homes, the closet flange may be cast iron and corroded, requiring replacement during a toilet swap. Wax ring failure is common in homes where the toilet has been in place for decades.
How much does a fill valve replacement cost in Knoxville?
Fill valve replacement in the Knoxville area generally ranges from about $155 to $325, with many installations around $225.
Ask AI Plumber About Your Situation
Our AI Plumber already knows the Knoxville market range for this service. Tell it about your specific situation and it can help you understand what might move your installation toward the lower or higher end.
Ask AI Plumber About My SituationThese figures are general Knoxville-area market estimates based on typical project scope, equipment and material type, standard labor, installation complexity, and Knoxville-area market conditions. They are not The Classic Plumber's official pricing and should not be considered a quote for your specific project.
The Classic Plumber works to provide fair, competitive pricing based on the actual work required, equipment/materials selected, access, existing conditions, and project scope. Your actual Classic Plumber price may be lower or higher than the market ranges shown here depending on the specific job.
These estimates are not derived from proprietary pricing data or a statistical survey of local homeowners. When a service varies significantly, we use tiered ranges or broader estimates rather than false precision.
Reviewed by Paul Hall, Owner & Licensed Plumber
The Classic Plumber · Knoxville, TN · License #4268. Pricing information last reviewed: September 2026. Market estimates are reviewed periodically and may not reflect real-time pricing.
Want an exact price for your home?
The cost guide gives you market ranges. For a real quote on your specific situation, request service from The Classic Plumber.