Main Water Shut-Off Valve Replacement Cost
Replacing a main water shut-off valve runs $150 – $600, usually as a gate-to-ball-valve upgrade that finally gives you a reliable quarter-turn shutoff. The job requires shutting water at the street, so a meter key or the utility comes into play. Most people discover a seized main valve during the exact emergency it was supposed to stop. Here is the pricing and the coordination involved.
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| Item | Range | Note |
|---|---|---|
| Main shut-off valve replacement | $150 – $600 | Gate-to-ball upgrade, accessible location |
| Fixture angle stop (each) | $75 – $150 | Under a sink or toilet |
| Whole-house angle-stop refresh | $400 – $1,000+ | Bundled replacement of all fixture stops |
| Curb-stop / street-side issue | Utility or $1,000+ | When the problem is at the meter or curb |
| Meter key (DIY tool) | $10 – $30 | Turns the street-side shutoff |
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Why the valve gets replaced at all
The main shut-off is the valve that stops all water to the house, usually found where the supply line enters: a basement wall, a garage, a utility closet, or near the water heater. Older homes often have a gate valve here, the round-handled kind, and gate valves seize. The stem corrodes, the gate inside crumbles, and the handle either spins uselessly or refuses to turn at all.
A replacement swaps that for a quarter-turn ball valve, which is far more reliable and lets you kill the water in one motion. The job runs $150 – $600 depending on access and pipe condition. That is the single most useful valve in the house to have working, because every burst pipe and every overflowing fixture race ends at it.
Why seized valves get discovered during emergencies
Nobody tests their main shut-off on a calm Sunday. They reach for it when a supply line lets go, a burst pipe is flooding a room, or a fixture will not stop running, and that is the moment a corroded gate valve refuses to close. The emergency and the discovery arrive together, which is the worst possible time to learn the valve does not work.
If you have an old gate valve and have never turned it, that is the argument for replacing it before you need it. A plumber can swap it on a quiet weekday for $150 – $600, versus calling someone at 2 a.m. while water spreads. Knowing where it is and that it turns is basic insurance, the same way knowing how to handle frozen pipes is before a cold snap.
The street-side shutoff and curb stop
Replacing the main valve means turning off the water upstream of it, which lives at the street. There is a curb stop or meter valve out at the property line, operated with a meter key, a long T-shaped tool that costs $10 – $30. Many plumbers carry one and shut it themselves; some jurisdictions require the utility to operate the curb stop, which adds a coordination step and sometimes a day of lead time.
If the problem turns out to be the curb stop itself (seized, broken, or leaking out at the meter) that is a different and larger job. Repairs on the street side are often the utility responsibility, or if they fall to you, can run $1,000 or more because they involve digging at the property line. Your plumber sorts out which side of the meter the fault is on before quoting.
Fixture shutoffs are worth doing at the same time
The main valve has small cousins at every fixture: the angle stops under each sink and toilet that let you isolate one fixture without killing the whole house. These corrode and seize just like the main, and a frozen angle stop turns a five-minute faucet repair into a whole-house shutdown. The same goes for the outdoor shutoffs that let you winterize an outdoor faucet. Replacing an angle stop runs $75 – $150.
If a plumber is already at the house upgrading the main valve, refreshing the fixture stops in a bundle is efficient: a whole-house angle-stop refresh runs $400 – $1,000 or more depending on fixture count, and it means every future repair can isolate cleanly. It is the kind of unglamorous work that pays off the next time anything leaks.
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