Dishwasher plumbing in London kitchens
A dishwasher needs a cold water feed, a valve to isolate it, and a waste connection with an air break. When we’re called out for dishwasher plumbing in London, it’s usually that waste. Without a high loop on the hose, sink water can run back into the machine, or the machine empties itself as it fills.
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Price up your dishwasher plumbing job
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Keep your phone close — we’ll ring the number you gave us. Need someone sooner? Call 0203 488 0733.
What the job involves
- Your new dishwasher connected and tested
- An isolating valve added if there isn’t one
- Waste connected properly to a standpipe or sink trap
- Fitting integrated and built-under machines
- Moving your dishwasher as part of a kitchen refit
- Leaks, standing water and drainage problems
A few things to check
A quick look might sort it without us. We’re happy to say so.
Most problems start at the waste
Before the drain hose drops to the trap, it should rise in a loop above the machine. Leave that out and one of two things happens: dirty water from the sink finds its way back in, or the machine siphons itself empty and never washes properly.
Integrated machines need a precise gap
Built-in dishwashers leave very little room for error, and the pipes need to sit in the space behind, not where the machine goes. If your kitchen is being fitted, get the pipework in place before the units arrive.
One valve, just for the dishwasher
You’d be surprised how many dishwashers don’t have one. Every machine should have its own small valve on the cold feed, so it can be pulled out or replaced without draining anything.
Standing water isn’t always a blocked drain
Water sitting in the bottom could be a clogged filter, a kinked hose or the waste connection, not the drain itself. Check the simple things first. We’ll talk you through them before booking a visit.
Questions we get a lot
Do you fit integrated dishwashers?
We do, and we’ll fit the decor door too, as long as the hinges and template allow. Tell us the model and the opening size, and we’ll explain what’s involved.
What stops a dishwasher draining?
Usually it’s the filter or the waste hose, not the machine. If your sink is slow to drain too, the shared waste is the problem, and that’s a drain job rather than an appliance one.
Can my dishwasher share the sink waste?
It can, and that’s the normal way to do it. The hose connects to a spigot on the sink trap, with a high loop above. The one thing to avoid is it discharging below the water line in the trap.
Can you supply the dishwasher?
No. Buy your machine wherever it’s cheapest and we’ll plumb it in. That usually works out better for you than paying a trade markup on the appliance.
More of our laundry & kitchen work
Not a new fit after all? If something needs mending instead, start here.
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General Plumbing
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Drain Unblocking
Blocked sinks, toilets and outside drains cleared with the right kit, not a bottle of chemicals.
Read about Drain Unblocking
More things we fit and fix
Dishwasher Plumbing in London, sorted
Tell us where you are and what you need. You’ll get the price before we start.