Replacing a water valve under a sink typically costs $150-$350 for one standard shutoff valve, with a national midpoint near $225. The cost to replace a water valve under a sink depends on the plumber’s minimum charge, valve type, access, and whether old or damaged pipe needs repair.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| One shutoff valve replaced | $150 | $225 | $350 | Standard access and no pipe damage |
| Two valves under one sink | $250 | $400 | $600 | May cost less per valve when done together |
| Valve and pipe repair | $250 | $450 | $900 | Higher when corrosion or a leak complicates work |
| Valve materials | $10 | $25 | $60 | Per valve; specialty fittings can cost more |
What a Single Under-Sink Shutoff Valve Usually Costs
A plumber commonly charges $150-$350 to replace one accessible angle stop or straight stop valve. The total usually includes the service call, a standard quarter-turn valve, installation, and a basic leak test. A simple compression-fit valve on sound copper or PEX is typically near the lower end; difficult access or a higher local service minimum pushes the estimate up.
For a routine replacement, budgeting about $225-$275 for one valve is practical. A homeowner buying the valve separately may see a $10-$60 part price, but many plumbers supply the fitting and warranty their work only when they provide the materials.
Assumptions: One standard kitchen or bathroom sink valve, normal access, no cabinet removal, and no damaged supply pipe.
How Valve, Labor, and Pipe Work Shape the Quote
Quotes commonly combine a call-out or minimum labor charge with parts and any extra pipe work. Plumbers may charge a flat fee for a straightforward job or bill hourly when the condition of the plumbing is uncertain. Ask whether the quoted amount includes the service visit, replacement supply line, disposal, and a post-installation leak check.
| Quote component | Typical price | What it covers |
|---|---|---|
| Service call or minimum | $75-$150 | Dispatch and initial labor allowance |
| Valve and fittings | $10-$60 per valve | Standard quarter-turn valve and connectors |
| Installation labor | $75-$150 per hour | Shutoff, removal, fitting, and leak test |
| Supply line replacement | $10-$40 per line | New braided connector, if needed |
| Pipe repair or access work | $50-$300+ | Extra fittings, pipe section, or difficult access |
For an hourly quote, the labor portion is roughly time on site multiplied by the plumber’s rate. A one-valve job may have a minimum charge even if the hands-on work takes less than an hour.
When Old Copper Lines or Corrosion Raise the Price
The valve itself is often inexpensive; the connection at the wall can determine whether the job stays simple. A seized nut, corroded threads, brittle galvanized pipe, or a valve soldered directly to copper may require more time or a different method. If the pipe twists, cracks, or leaks when the old valve is removed, a plumber may need to repair the stub-out rather than attach a new valve to it.
Expect added charges of roughly $50-$300 for uncomplicated pipe or fitting repairs, with extensive wall or cabinet access work potentially costing more. Replacement of a soldered valve may add $50-$150 compared with a straightforward compression connection. Prices vary by pipe material, access, and whether the main water supply must be shut off.
Space also matters: a valve behind a drawer, tight cabinet divider, or built-in appliance can take longer to reach. A visible, unobstructed valve is generally less expensive to service than one that requires removing cabinetry or opening a wall.
How Long Does a Plumber Need to Replace One Valve?
A standard replacement often takes 30-60 minutes of on-site labor once the water is shut off and the valve is accessible. A stuck fitting or a replacement on a soldered copper line may take 1-2 hours. If the plumber must locate a main shutoff, drain a long line, or repair a damaged pipe, the visit can take longer.
Short job time does not always mean a low invoice because dispatch fees and minimum labor charges commonly set the floor. Some companies charge a flat $150-$350 for the first valve; additional valves at the same sink may add $75-$200 each when the work can be completed in one visit.
Three Under-Sink Valve Quotes by Scope
These examples show how scope changes the total rather than serving as fixed national prices. Labor rates, access, and local minimum charges can shift each estimate.
| Job scenario | Labor and parts | Estimated total |
|---|---|---|
| One compression valve, accessible copper stub | 45 minutes; $20-$40 part | $150-$250 |
| Two valves and two new supply lines | 1-1.5 hours; $50-$120 parts | $275-$475 |
| One corroded valve with short pipe repair | 1.5-2.5 hours; $40-$100 fittings | $400-$750 |
The second valve is often less costly to replace during the same appointment than on a separate service call. The savings depend on the company’s minimum charge and whether both valves need the same level of repair.
Do Urban Plumbing Rates Change the Total?
Local labor and dispatch costs can move the same valve job substantially. Large coastal cities and high-cost metro areas may run about 15%-35% above a national midpoint, while smaller towns and rural areas may be 10%-20% below it. Rural estimates can still rise when travel fees apply or the nearest plumber has a long drive.
Compare the written scope, not just the advertised hourly rate. A lower hourly rate may come with a separate trip charge, while a flat-price quote may include parts and testing. Emergency or after-hours service can add $100-$300 or more, particularly when a leak requires immediate attention.
Which Prep and Material Choices Can Lower the Bill?
Clear the cabinet, remove stored items, and make the shutoff easy to reach before the appointment. Confirm that the plumber can access the building’s main shutoff if the under-sink valves do not work. This preparation will not remove a company’s minimum charge, but it can prevent avoidable time spent moving belongings or searching for controls.
Keeping the job to a standard quarter-turn valve and replacing only necessary parts usually controls the price. Ask for a separate price for upgraded finishes, specialty valves, or new supply lines rather than accepting add-ons automatically. If both sink valves are old, request a bundled quote; replacing them together may avoid paying two service-call minimums.
When Is Replacing Both Sink Valves Cheaper?
Replacing both hot- and cold-water valves makes sense when both are similarly aged, stiff, corroded, or unable to shut off completely. A second valve may add $75-$200 when done during the same visit, compared with a separate call that could trigger another $75-$150 service minimum. If one valve is new and operates reliably, replacing it solely to match the other may not be worthwhile.
Ask the plumber to price one valve and both valves separately before approving the work. A quote should identify valve type, any supply-line replacement, labor or minimum charge, pipe repairs, and warranty. If the estimate includes extensive repair, a second opinion can help distinguish necessary work from optional upgrades.