Where it usually is
In a typical Markham house the supply pipe pokes up through the slab or out of the foundation on the street side, close to where the city line runs under the lawn. The meter sits there, with a valve on one or both sides of it. Look in the furnace room, a front storage room, or behind an access panel under the basement stairs.
- Detached and semi-detached homes: front basement wall, near the floor.
- Townhouses: often in a utility closet or under the stairs.
- Condo suites: a valve in the laundry or mechanical closet, sometimes behind a panel.
- Finished basements: look for a removable panel in the drywall or a cabinet door.
Gate valve or ball valve?
| Type | Looks like | How it closes |
|---|---|---|
| Gate or globe valve | Round wheel handle | Many turns clockwise |
| Ball valve | Straight lever | Quarter turn so the lever crosses the pipe |
Older wheel-handled valves often seize or close only partly. A lever ball valve closes in one motion and seals well.
Our crew would go about it like this
- 1
Close the main valve and crack the laundry tub tap so the lines bleed down.
- 2
Open drywall or ceiling only where the meter and stains point.
- 3
Cut back to sound pipe and join new copper or PEX with proper fittings.
- 4
Restore pressure slowly, check the joint, then leave the opening dry before patching.
Step by step: testing it
- Turn on a cold tap on the main floor.
- Close the main valve slowly and fully.
- Watch the tap; flow should stop within a minute.
- A tap that keeps flowing means the seat inside is worn.
- Reopen the valve slowly, and check the stem for drips.
Handing it over to us
When the valve weeps at its packing nut, only half-closes, or hides behind drywall nobody remembers, have it replaced or located before an emergency. The job itself is described under main shut-off valve replacement. Hang a bright tag on it for the whole household, and read the burst pipe walk-through for what to do next.
Markham note: village-core houses tend to hide cast iron and galvanized behind plaster, while Cornell and Box Grove builds run PEX to a manifold. We ask the year your house was built so the right fittings ride along on the truck.
Straight from the phone log
Is there a valve at the street?
Yes, a curb stop near the property line, but it is the city’s to operate. Use the valve inside the house.
Should I label my valve?
Yes. Yes. A coloured tag saves precious seconds when someone else is home alone with a leak.
Ready to get it fixed?
One call, a clear explanation, and work finished tidily before we leave.