What it usually means, the likely causes in order, what to safely try first, what a pro charges in Canada, and when to stop and call one.
This guide covers the common cases. Describe your exact problem and get a personalized diagnosis — free to start, with a DIY vs. call-a-pro verdict and a real cost estimate.
A dishwasher leaking onto the kitchen floor is leaking from a short list of places: around the door (a gasket or latch problem), from underneath (a hose, pump seal, or inlet connection), or because it's filling too much water in the first place (a float that isn't shutting the fill off). Where the puddle appears is your first diagnostic: water at the front corners implicates the door seal, while water emerging from under the machine or in the cabinet beside it points underneath. Stop using it until you've looked — a slow, hidden leak under a dishwasher is a classic cause of quietly rotted kitchen subfloors.
Stop running it now and dry the floor; that converts most dishwasher leaks from damage-in-progress to a simple repair. It's same-week urgent rather than same-day, provided it isn't leaking while idle — a machine that leaks when it isn't running has a supply or inlet-valve problem and should have its water shut off at the valve under the sink until it's fixed.
The rubber seal around the door traps a tub full of sloshing water. Food debris caught in the fold, a tear, or rubber that's gone stiff lets water escape at the front corners — typically during the wash, not while filling or standing.
A bent hinge, a failing latch, or a rack pushing against the door can hold it slightly ajar against the gasket. The seal itself may be fine while the door never fully compresses it.
Hoses under the machine chafe, age, and work loose at their clamps. These leaks appear under or beside the machine rather than at the front, and a drain-side leak shows up mainly while the machine is pumping out.
The float in the tub tells the machine when to stop filling. If it's stuck down by debris — or the inlet valve sticks open — the tub overfills and water escapes over the door sill, sometimes dramatically. Overfill leaks come with visibly too much water in the tub.
Dish soap or laundry detergent by mistake creates foam that expands past the door seal — a genuine leak with a very un-mechanical cause. If the 'leak' followed someone hand-washing detergent into the machine, check for suds in the tub before suspecting parts.
| Job size | Typical estimate (CAD) |
|---|---|
| Simple fix — the straightforward version of this repair | $110–$250 |
| Major job — complex, hidden, or replacement-level work | $300–$900 |
Estimates only, calibrated to Greater Toronto Area trade rates and adjusted by region on this site — not a quote. Your exact price depends on the cause, parts, and access. A personalized diagnosis narrows this range using your specific symptom.
Gasket cleaning and replacement, float freeing, and latch checks are reasonable DIY on many models — the gasket usually pulls out of its channel by hand. Anything underneath beyond looking (pump seals, inlet valves, hose replacement inside the machine) is balanced on your comfort with power off and water off; many owners reasonably hand it to a pro, who will also check the floor for hidden damage — ask them to look, because that's the part with real money attached.
Intermittent leaks usually track water level or load: a heavy load can deflect spray directly at a weak gasket spot, and overfill faults can be occasional if the float sticks only sometimes. Note which cycles leak and how the machine was loaded — that pattern is genuinely useful information for a technician, and it rules out a constantly-failed part.
It depends on duration. A recent leak may only need drying; a long, slow one can swell particleboard cabinets and rot the subfloor, sometimes needing flooring repair after the appliance is fixed. If the floor feels soft or the cabinet base is swollen, photograph it and have whoever repairs the leak assess the floor too — fixing the machine without fixing the floor leaves the expensive half undone.
If the gasket is torn, stiff, or pulling out, yes — it's an inexpensive, model-specific part that fits by hand on most machines. But if the leak is underneath or the tub is overfilling, a new gasket won't stop it, so locate the leak first (the paper-towel mapping trick) and then replace the part that's actually failing.
That points to the water inlet valve not closing fully, letting supply pressure seep into the tub until it overflows — or to a supply connection leak. Shut off the dishwasher's water supply (usually a valve on the hot line under the sink) and book a repair; an idle leak doesn't stop on its own and can run all night.
Describe what's actually happening and get a personalized diagnosis — DIY vs. call-a-pro verdict, real cost estimate, and top-rated local pros.