A leaking washing machine or dishwasher is usually caused by a split inlet hose, a worn door seal, a loose drain hose connection, or a blocked filter forcing water to overflow. Check hoses and seals first. If the puddle keeps returning after you've checked the appliance, water may be tracking from a pipe behind or under it instead.
In This Guide
Why appliances leak more than people expect
Washing machines and dishwashers push water through several connections every cycle: an inlet hose, an internal valve, a drum or tub seal, and a drain hose out to the waste. Each connection is a place a leak can start. Because these appliances are usually tucked into a kitchen unit or utility cupboard, a small leak can run for weeks before anyone notices the skirting board has swollen.
We see this pattern a lot: someone notices a bit of water on the floor after a wash, wipes it up, and assumes it was a one-off spill. Then it happens again the next week, and by the time they call someone, the floor underneath has already taken damage.
Age plays a part too. A machine in its first year or two rarely leaks unless it was installed badly, a hose left loose or a foot not levelled properly. Past the five or six-year mark, rubber components start to perish regardless of how well the appliance has been treated, and that's when hose and seal failures become far more common.
Checking the hoses
The inlet and drain hoses are the first thing to check, and the easiest to fix yourself.
Step 1: Pull the appliance out carefully
Turn off the water supply valve first. Most washing machines have a valve on the pipe feeding the inlet hose, usually behind or beside the appliance.
Step 2: Inspect the inlet hose along its full length
Look for bulges, cracks, or a section that feels soft compared to the rest. Rubber hoses perish with age and heat, and a bulge is often the early sign of a hose about to split.
Step 3: Check both hose connections are tight
A loose connection at the wall or at the appliance is a common, cheap-to-fix cause of a small ongoing leak.
Step 4: Check the drain hose isn't kinked or dislodged
A kinked drain hose can force water back out during the pump-out cycle instead of down the waste.
When a DIY check isn't enough
If the hoses, seals and connections all look fine but water keeps appearing, the source might not be the appliance at all. That's when a proper diagnostic check, rather than another guess, saves time.
Door seals and detergent drawers
On front-loading washing machines, the rubber door seal is a common leak point, especially once it's a few years old.
- Perished rubber. The door seal flexes every cycle and eventually cracks or splits, letting water escape during the wash.
- Trapped debris. Coins, hair grips or small items caught in the seal's folds can hold it slightly open, letting water past.
- Detergent drawer overflow. A blocked drawer or the wrong amount of detergent can cause overflow at the top of the machine rather than the door itself.
- Dishwasher door seals. The same wear pattern applies, plus a door not closing fully due to a misaligned hinge or a full rack blocking it.
Most of these are visible with a torch and a close look, no tools required. If the seal looks intact but water's still escaping around the door, the drum bearing or an internal component might be at fault, which usually needs an appliance engineer rather than a plumber.
Standpipes and drain connections
The standpipe, the vertical pipe the drain hose connects into, is another spot worth checking, particularly in older kitchens.
A standpipe that's too short, too tall, or fitted without the correct trap can allow water to siphon back or overflow during draining. This is a plumbing fault rather than an appliance fault, and it's often missed because the symptoms look identical: water on the floor after a cycle.
If your kitchen has had appliances swapped in and out over the years, it's worth checking whether the standpipe height still matches the current machine's manufacturer guidance, since a mismatch is a surprisingly common, invisible cause.
Not sure if it's the machine or the pipework?
We diagnose whether water under an appliance is coming from the unit itself or from a pipe leak nearby, using non-invasive methods that don't involve pulling out your kitchen.
Appliance leak or pipe leak: telling them apart
Once you've ruled out the obvious appliance faults, the next question is whether the water is really coming from the machine at all.
Signs it's the appliance
- Water only appears during or right after a wash cycle
- Puddle is directly under or in front of the machine
- Visible crack, split or wear on a hose or seal
Signs it's a pipe leak
- Damp appears even when the appliance hasn't run for days
- Water tracks from behind the unit, further along the wall or floor
- Skirting board or floor covering is swollen some distance from the machine
Where a supply pipe feeding the appliance runs behind a fitted kitchen unit, a leak there can look identical to an appliance leak at first glance. Pulling out a full run of units on a guess is disruptive, so this is exactly the kind of case where plumbing leak detection earns its keep, confirming the source before anything gets dismantled.
The slow drip nobody notices
A washing machine or dishwasher tucked into a kitchen unit hides a leak better than almost any other appliance in the house. Water runs down the back of the cabinet, soaks into chipboard flooring, and by the time a smell or a soft patch of floor gives it away, the damage has been building for a while.
We see this most weeks: a slow leak behind a dishwasher that's been quietly rotting the base unit and the floor beneath it, discovered only when the appliance is finally pulled out for something unrelated. Catching it early with a check every few months, especially on appliances installed under worktops, is worth the two minutes it takes.
In tenement flats and older conversions, a leak from an integrated appliance in an upstairs kitchen can travel through a floor void and show up as a stain on the ceiling below, in a completely different property. If you own the flat below and see this, it's worth raising it with whoever's above before assuming it's your own pipework at fault.
Frequently Asked Questions
Every few months is a reasonable habit, and definitely after five years of use, since rubber hoses degrade with age even without visible damage. A quick pull-out and visual check takes a couple of minutes.
Yes, and it's one of the most common ways floor damage goes unnoticed. Water spreads under the appliance and into surrounding flooring before it becomes visible, so a musty smell near the kitchen units can be an early warning sign.
Water damage is usually covered as standard in buildings insurance, per the Association of British Insurers, though the appliance repair itself typically isn't. Check your own policy schedule, since terms vary between insurers.
Intermittent leaks often come from a seal or connection that only fails under certain conditions, a particular water level, spin speed, or load size. This makes them harder to catch but no less worth investigating.
If the fault is clearly inside the machine, a valve, drum seal or internal part, an appliance engineer is the right call. If you suspect the supply or drain pipework itself, a leak detection specialist or plumber is better placed to check.
Run the appliance empty and watch closely during the cycle. If no water appears at the machine itself but a damp patch still develops nearby, the source is more likely a pipe behind or under the cabinetry.
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