How to Install a Dishwasher: A Step-by-Step Guide

Installing a dishwasher might seem daunting, but for a freestanding model replacing an existing machine, it's a manageable DIY task for a handy homeowner. This guide walks through the process step by step. For built-in integrated models or first-time installations with no existing plumbing, we recommend using a licensed plumber.

What You'll Need

• Adjustable spanner or pliers
• Flat-head and Phillips screwdrivers
• Tape measure
• Bucket and towels
• Plumber's tape (PTFE tape)
• Level

Your new dishwasher should come with an inlet hose, outlet drain hose and a user manual with specific installation instructions. Always read the manual for your model before starting.

Step 1: Turn Off the Water Supply

Locate the isolation valve under your kitchen sink (usually on the cold water pipe). Turn it clockwise until it stops. If there's no isolation valve, turn off the main water supply to the house.

Step 2: Disconnect the Old Dishwasher

If you're replacing an existing dishwasher:

• Pull it forward carefully — dishwashers usually sit on adjustable legs
• Disconnect the power (unplug from the wall or switch off at the circuit breaker)
• Unscrew the inlet hose from the under-sink water connection
• Remove the drain hose from under the sink
• Slide the old machine out

Step 3: Position the New Dishwasher

Slide the new dishwasher into position. Most standard dishwashers are 60cm wide and 85cm tall. Adjust the feet so the machine sits level and at the right height for your benchtop (typically 85–90cm). Use a spirit level to check.

Step 4: Connect the Water Inlet

Connect the inlet hose (usually 3/4-inch thread) to the cold water supply under your sink. Wrap PTFE tape around the threads first for a watertight seal. Hand-tighten, then give a quarter turn with pliers. Do not overtighten — this can crack the fitting.

Step 5: Connect the Drain Hose

The drain hose connects either to the sink waste pipe (via a T-piece connector) or to a dedicated dishwasher inlet on your sink. The drain hose should loop up high under the bench (use a drain hose clip if provided) before going down to the connection point. This high loop prevents backflow.

Step 6: Check Power Connection

Plug the dishwasher into a standard 240V power point. Most freestanding dishwashers use a standard power point — there's no special wiring required. Make sure the power point is switched off when connecting.

Step 7: Turn Water Back On and Check for Leaks

Turn the water isolation valve back on. Run the dishwasher on a short or rinse cycle while watching the connections for any drips. Check both the inlet connection and the drain hose.

Step 8: Run a Test Wash

Run a full wash cycle with no dishes inside. This flushes out any residual factory oils and confirms everything is working correctly. Check under the machine during and after the cycle for any leaks.

Important Safety Notes

• Never connect a dishwasher to hot water — always connect to the cold supply
• If you smell gas or see water damage to cabinetry, stop and call a professional
• In NSW, all plumbing work connected to the main water supply must be done by a licensed plumber for insurance and legal compliance

Need Help?

Oceania Appliances is happy to recommend trusted local installers if you're not comfortable doing the installation yourself. When you buy a dishwasher from us, ask about installation options at the time of purchase.

Shop dishwashers at Oceania Appliances — free delivery across Sydney, 3–6 month warranty on every appliance.