Water Leaking From the Ceiling: Who Should You Call?
Urgency: EmergencyUpdated 2026-08-31
Short answer
Shut off the water supply, contain the drip, and call a licensed plumber if the leak sits below a bathroom, kitchen or laundry room. If the ceiling is on the top floor with only the roof above it, call a roofer instead. Either way, do not wait for the stain to dry out on its own — hidden moisture becomes mould in as little as 48 hours.
Who to call: A licensed plumber first if there is a bathroom, kitchen or laundry above the stain — a roofer if the ceiling is directly under the roof.
What to do right now
- 1Turn off the main water shut-off valve if the water is clean and running steadily.
- 2Put a bucket under the drip and poke a small hole in the lowest point of the bulge so the water drains in one place instead of collapsing the drywall.
- 3Kill power to any light fixture or outlet near the wet area at the breaker panel.
- 4Move furniture and electronics out of the room and take photos before cleanup for your insurer.
Most likely causes
- Failed supply line or drain above
- Toilet wax rings, tub overflow gaskets, dishwasher hoses and washing machine lines are the most common source in a two-storey home.
- Roof or flashing failure
- Ice damming through a GTA winter, lifted shingles, or cracked flashing around a vent stack or chimney.
- Condensation on HVAC ductwork
- An uninsulated air-conditioning duct or blocked condensate line drips in summer and mimics a plumbing leak.
- Ice damming and gutter overflow
- Melt water backing up under the shingles and running down into the ceiling near exterior walls.
What it typically costs in the GTA
$180–$450 for a plumber to locate and repair a single supply-line or drain leak. $400–$1,200 for roof flashing repair. Drywall and ceiling repainting typically adds $300–$900.
Ranges are typical market pricing for the Greater Toronto Area and vary with access, age of the home, and time of year. Always get the scope in writing before work starts.
How to tell a plumbing leak from a roof leak
The pattern of the leak tells you most of what you need. A plumbing leak is usually intermittent and lines up with use — it drips when someone showers, flushes, or runs the dishwasher. A roof leak follows the weather: it appears during or shortly after rain or a thaw and stops on dry days.
- Clean, clear water with no smell — most likely a supply line.
- Discoloured or foul-smelling water — a drain or waste line.
- Brown ring that grows only after storms — the roof.
- Leak appears only on hot, humid days — HVAC condensation.
What a pro will actually do
A plumber will trace the leak with a moisture meter, often cut a small inspection hole in the ceiling, isolate the fixture, and repair or replace the failed section. A roofer will inspect the deck, flashing and shingle field above the stain and seal or replace what has failed.
Ask for photos of the failure point before and after the repair. Any reputable pro will provide them without hesitation.
Will insurance cover it?
In Ontario, most home policies cover sudden and accidental water damage — a burst pipe, for example — but exclude damage from gradual leaks and deferred maintenance. That is why the timing of your call matters: documenting the leak the day you find it protects your claim.
Get the right pro on it
Describe the problem in your own words. We’ll work out which trade you need and connect you with suitable local pros. Free, no obligation.
Frequently asked questions
- Is a ceiling leak an emergency?
- Treat it as one if the water is active, the drywall is sagging, or the leak is near electrical fixtures. A sagging, saturated ceiling can collapse without much warning.
- Can I just paint over the stain?
- Not until the source is fixed and the cavity is fully dry. Painting over a damp ceiling traps moisture and the stain will bleed straight back through.
- How long before mould becomes a problem?
- Mould can begin colonising damp drywall and insulation within 24 to 48 hours, which is why drying matters as much as the repair itself.