Dishwasher plumbing in London
Every dishwasher needs three things: a cold water feed, its own isolating valve, and a waste connection with an air break built in. Most of the callouts Ninja Plumbers gets on this front come down to that last one — a waste hose fitted without the required high loop, which lets sink water siphon back into the machine or lets the machine drain itself empty partway through filling.
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What's included
- New dishwasher plumbed in and tested
- Isolating valve fitted where there is none
- Waste connection to a sink trap or standpipe, done properly
- Integrated and built-under appliance installation
- Moving a dishwasher during a kitchen refit
- Leaks, drainage faults and standing water
Worth knowing first
A bit of this might save you from needing a callout at all — we'd rather you knew it upfront.
The waste is where they go wrong
The drain hose has to rise into a loop above the machine before it drops away down to the trap. Skip that loop and dirty water from the sink can travel back into the dishwasher, or the machine ends up siphoning itself empty and never actually washing anything properly.
Integrated units need the opening right
Built-in machines have very little tolerance, and the services have to sit in the void behind rather than where the machine goes. If the kitchen is being fitted, get the pipework placed before the units go in.
It should have its own isolating valve
A small valve on the cold feed means the machine can be pulled out or swapped without draining anything. Every dishwasher should have one and a surprising number do not.
Standing water is not always a blockage
Water left in the bottom can be a blocked filter, a kinked hose or the waste connection rather than the drain itself. Worth checking the cheap things first — we will tell you how before booking a visit.
Common questions
Can you fit an integrated dishwasher?
Yes, including fitting the decor door where the hinges and template allow. Send us the model and the opening size and we can tell you what is involved.
Why will my dishwasher not drain?
Nine times out of ten it is a blocked filter or the waste hose at fault rather than the machine itself. If the kitchen sink is also draining slowly at the same time, the shared waste pipe is the real culprit, which makes it a drainage job rather than an appliance repair.
Can it share a waste with the sink?
Yes, that is the normal arrangement — into a spigot on the sink trap, with the high loop above it. What it should never do is discharge below the water line in the trap.
Do you supply the machine?
No. Buy the machine wherever it is cheapest and we will plumb it in — that usually works out better for you than an appliance supplied through a trade markup.
Part of our kitchen & laundry work
If it turns out to be a repair job rather than a new install, this is where that's covered.
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General Plumbing
Taps, toilets, radiators and pipework. The jobs that never quite get done.
More on General Plumbing -
Drain Unblocking
Sinks, toilets and outside drains cleared with proper equipment, not a bottle of chemicals.
More on Drain Unblocking
Other appliance work
Need dishwasher plumbing in London?
Let us know what’s going on and whereabouts you are, and we’ll give you a price before any work starts.