Installing a dishwasher looks straightforward but there are a few things that can go wrong. Here's what a professional installation involves and what to check first.
Before the Dishwasher Arrives
Before your new dishwasher is delivered, check that you have a cold water inlet supply within reach (usually the hot or cold supply under the kitchen sink), a waste outlet to connect the drain hose (either a spare entry on the sink waste trap or a standpipe), a 13-amp fused spur or socket nearby, and sufficient space in the cabinet aperture. Standard undercounter dishwashers are 45cm or 60cm wide, 85cm tall and 55–60cm deep — measure your opening carefully, including the door swing clearance.
What a Professional Installation Includes
A proper dishwasher installation involves: connecting the inlet hose to the cold water supply using an appropriate fitting, connecting the drain hose to the sink waste (and fitting an anti-siphon loop or air gap where required), levelling the machine on its adjustable feet so the door closes correctly, checking all connections for leaks, running a short test cycle, and adjusting the door hinges and kick plate if needed. For integrated dishwashers, the door panel and hinges also need to be fitted and adjusted.
Why DIY Dishwasher Installation Often Goes Wrong
The most common DIY installation errors are: using incorrect or incompatible fittings on the cold water supply, failing to install a proper anti-siphon loop on the drain hose (which can cause grey water to siphon back into the machine), over-tightening compression fittings and cracking them, and not checking under the machine during the first full cycle. A slow drip at a poorly made joint can go unnoticed for months and cause significant damage to the cabinet carcass and floor.
Integrated vs Freestanding
Freestanding dishwashers are the easiest to install — they sit in a floor space and just need connecting. Integrated dishwashers fit inside a kitchen cabinet and require a furniture door panel to be fitted to the dishwasher door. The hinge mechanism must be correctly set so the furniture door opens and closes squarely with the machine door. This adds time to the installation and requires some adjustment skill to get right.
When to Call a Professional
If there is no existing cold water supply near the dishwasher position, new pipework will be needed — this is a plumbing job. If the waste needs to be taken further than a standard drain hose allows, an extension or a pump-assisted drain may be needed. If you are installing in a new position rather than replacing an existing machine, the job almost always needs a plumber and possibly an electrician. Zebra Trades handles dishwasher and appliance installations throughout Hertfordshire — contact us for a free quote.