Dishwasher plumbing in London
A dishwasher needs a cold feed, an isolating valve and a waste connection with an air break. Most of the callouts we get are about the last one: a waste hose fitted without a high loop, which lets sink water back into the machine or lets the machine empty itself as it fills.
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What this includes
- 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
Some of this may save you a callout entirely. We would rather tell you than not.
The waste is where they go wrong
The drain hose needs a high loop above the machine before it drops to the trap. Without it, dirty water from the sink can run back into the dishwasher, or the machine siphons itself empty and never washes 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?
Most often the filter or the waste hose rather than the machine. If the sink also drains slowly, the problem is the shared waste and that is a drain job rather than an appliance one.
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 the job turns out to be a repair rather than an installation, these are the pages that cover it.
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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?
Tell us what’s happening and where you are, and we’ll tell you what it costs before anyone starts work.