What main shut-off valve replacement involves
The main valve sits where the water service comes through the foundation, usually near the meter. Replacing it means the water has to be off upstream, at the City's curb stop near the property line. We coordinate that through Toronto Water when needed, drain the house side, remove the old stop and fit a full-port ball valve with a drain. We then restore the supply, bleed air, and check the meter connections for weeping.
- Old style: a round wheel handle, many turns, a rubber washer that hardens with age.
- New style: a lever that turns ninety degrees, open in line with the pipe and closed across it.
- A drain fitting goes on the downstream side so lines can be emptied for repairs.
Why North York houses need it
Gate and globe valves installed sixty years ago in St. Andrew-Windfields, Lansing and similar streets often have not been turned in decades. Turn them now and some will snap the stem, others will drip from the packing nut, and many will not seal fully even when closed. A valve that does not close turns a small leak into a ruined basement.
Plumber's tip: Twice a year, close your main valve and open a tap to confirm the water stops. Then reopen it. If it refuses to turn by hand, do not lean on it with a wrench; call us.
How we write up the job
We note the old valve type, pipe size and material, curb stop location, new valve model and whether a drain was added. The sheet includes a simple sketch of where the valve is, so anybody at home can locate it at two in the morning.
Signs you should call
- The handle is stuck, or spins without stopping the water.
- Drips or mineral crust around the valve stem.
- You are about to renovate and will need to shut the water often.
- A lead service is being replaced.
Valves behind toilets and under sinks age the same way; see toilet repair and shower valves.
Costs and what affects them
Whether the City must shut the curb stop, the state of the pipe either side, and the clearance around the meter decide the time involved. We quote the valve and any pipe repair as separate lines.
Job at a glance
| Category | Pipes |
|---|---|
| Tools | Ball valve, press or solder kit, pipe cutter |
| Final test | Valve closes fully with no flow at a test tap |
Tell-tale signs
- Main valve handle won't turn
- Valve drips from the stem when moved
- Old gate valve that never fully closes
Steps on the job
- Arrange the City curb stop to be closed
- Saw out the seized valve and deburr both stubs
- Press in a full-bore lever ball valve
- Restore supply and check for weeps
Your questions on this one
Is the main valve a DIY job?
It involves the water service and often the City's curb stop. Hire a licensed plumber.
Where is the curb stop?
Usually near the front property line under a small metal cap. Only the City should operate it.