Burst Pipe in Winter: What to Do in the First 10 Minutes (Toronto)

Water from a burst pipe can flood a Toronto basement in minutes and cause tens of thousands of dollars in damage. What you do in the first 10 minutes matters more than anything a plumber does later.

Minutes 1–3: Shut Off the Water

Your only job in the first minutes is to stop the flow. Everything else can wait.

1. Find your main shut-off valve. In most Toronto homes it's in the basement, near the front foundation wall, where the water line enters from the street — usually within a metre of the water meter. Turn a wheel clockwise; push a lever perpendicular to the pipe.
2. If the valve won't budge, use the curb stop (under a round metal cap near the property line) with a curb key, or call 311 to have Toronto Water shut it off.
3. Open taps to drain the system. Once the main is off, turn on the lowest tap in the house and the highest tap to let remaining water drain by gravity.

Minutes 4–10: Control the Damage

1. Shut off electricity near the water. If water is near outlets, the breaker panel, or the furnace, turn off those breakers first — or the main breaker if you're unsure. Never step into standing water to reach the panel.
2. Contain the water. Buckets under active drips, towels along doorways to keep water from spreading, and move furniture, rugs, and electronics out of the path. Start from the lowest point, since water runs downhill.
3. Drain water from the burst section. If you can safely access the burst pipe, place a bucket under it. Don't try to patch a pressurized pipe — the valve is off, so pressure is already dropping.
4. Take photos and video. Document the burst location, the water spread, and damaged items — your insurer will want this. Open cabinets and closets; water hides.
5. Call a plumber. Emergency plumbers in Toronto typically charge $150–$250/hour after hours, plus parts. Say the main is off and where the burst is — it speeds up the fix.

Preventing Frozen Pipes (Toronto Winters)

Toronto's deep frost and older housing stock — pre-1980s homes often have water lines in uninsulated exterior walls, crawl spaces, and unheated garages — make this a when-not-if risk. These spots freeze first when temperatures drop below about −7°C.

• Insulate vulnerable pipes. Foam pipe sleeves ($2–$5 per metre at any hardware store) on pipes in crawl spaces, attics, and exterior walls. For extreme spots, add electric heat tape ($25–$50) with a thermostat control.
• Let taps drip. During extreme cold snaps (below −15°C), a slow drip from the faucet furthest from the main valve keeps water moving — moving water freezes far slower than still water.
• Keep the thermostat up. Never let the house drop below 13–15°C, even when you're away. A week at a ski chalet with the heat at 10°C is how pipes freeze.
• Seal cold-air entry points. Gaps around hose bibs and unsealed crawl-space vents blast cold air directly onto pipes — spray-foam them shut.
• Shut off and drain exterior hose bibs. Turn off the interior shut-off valve for each outdoor tap in October, then open the outdoor tap and leave it open for winter.

Toronto-Specific Notes

Condos: different playbook

If you live in a condo, do not try to fix the building's plumbing yourself. Call building management or the superintendent immediately — they control the building's main valves and risers. Then notify the unit below you: water from your burst pipe becomes their ceiling problem within minutes.

When to Call a Plumber vs DIY

Shutting off the main, draining pipes, containing water, and documenting for insurance are all homeowner jobs. Replacing burst sections, seized valves, or anything involving gas or the electrical panel needs a licensed pro.

Insurance Tips for Burst Pipes

• Sudden bursts are usually covered. Most Ontario home insurance policies cover damage from a sudden and accidental burst — water damage to floors, walls, and belongings.
• Gradual leaks are usually NOT covered. If a pipe has been dripping for months and you only notice the mould, insurers treat that as a maintenance failure. The distinction between "sudden" and "gradual" is where claims get denied — check your policy wording.
• Document everything. Photos, video, a written timeline, and receipts for every emergency expense — hotel stays, plumber call-outs, equipment rentals.
• Mitigate first, argue later. Insurers expect you to act quickly to limit damage. Call your broker within 24 hours, but don't wait for an adjuster before stopping the water.
• Check your deductible and water-damage caps. Some policies cap water-damage payouts separately — know your limits before winter.

Frequently Asked Questions