Installing a dishwasher requires careful consideration of space, plumbing, and electrical requirements. Whether you're replacing an existing unit, adding a dishwasher to a kitchen renovation, or installing one in a property that's never had one, this comprehensive guide covers everything Australian homeowners need to know. From measuring your space to understanding when professional help is required, we'll walk you through the entire process.
Key Takeaway
While some aspects of dishwasher installation can be DIY projects, electrical work must be performed by a licensed electrician in Australia, and plumbing work should comply with local regulations. Plan your installation carefully to avoid costly mistakes and ensure safety.
Types of Dishwasher Installation
The installation process varies depending on the type of dishwasher you're installing. Understanding these differences helps you plan appropriately.
Freestanding Dishwashers
Freestanding dishwashers are the most flexible option. They have finished sides and tops, allowing them to stand alone or be placed between cabinets with minimal modification. They're easier to install than built-in units and can be moved if you relocate. Standard freestanding models are 60cm wide, with compact options at 45cm.
Built-In (Underbench) Dishwashers
Built-in dishwashers fit under your kitchen benchtop and between cabinet units. They typically require more precise measurements and may need cabinet modifications. These units have unfinished sides (as they won't be visible) and often need to be secured to adjacent cabinetry.
Fully Integrated Dishwashers
Fully integrated dishwashers accept a cabinet door panel on the front, completely hiding the appliance when closed. Installation is more complex, requiring careful alignment and door panel fitting. These are typically installed during kitchen renovations.
Benchtop Dishwashers
Benchtop or countertop dishwashers sit on your kitchen bench and connect to the kitchen tap via an adapter. They require no permanent plumbing or electrical installation, making them ideal for renters or small spaces. Simply connect the hoses, plug in, and go.
Drawer Dishwashers
Drawer dishwashers (like Fisher & Paykel's DishDrawer) have unique installation requirements due to their pull-out drawer design. They require precise levelling and may need custom cabinet configurations. Always consult the manufacturer's specific installation guide.
Measuring Your Space
Accurate measurements prevent the frustration of a dishwasher that doesn't fit. Take these measurements before purchasing.
Standard Dimensions
Most full-size dishwashers are 60cm wide, 85cm high, and 60cm deep. Compact models are 45cm wide. However, actual dimensions vary slightly between brands and models, so always check the specific product specifications.
What to Measure
- Width: Measure the opening width at the top and bottom. Walls can be slightly uneven
- Height: Measure from floor to underside of benchtop. Account for flooring if it continues under the dishwasher
- Depth: Measure from the back wall to the front of the cabinets. Allow space for hose connections at the back
- Door clearance: Ensure there's room for the dishwasher door to fully open without hitting islands, other appliances, or walkways
Clearance Requirements
Allow at least 50mm clearance at the back for water supply and drain hoses, plus the power cord. Some models require more; check your specifications. There should be no obstructions above when the door is open for loading the top rack.
Plumbing Requirements
Dishwashers need both a water supply and a drain connection, typically located near your kitchen sink.
Water Supply
Most dishwashers connect to the cold water supply only, as they heat water internally. Some models can connect to hot water if your hot water system is set to 60°C or below. The water supply requires a dedicated valve (isolation tap) that can be shut off for servicing.
The typical connection point is a Y-connector or dual shut-off valve under the sink, splitting the cold water between the tap and dishwasher. A flexible braided stainless steel hose connects from this valve to the dishwasher.
Drain Connection
The dishwasher drain hose connects to your sink drain system, either through a spigot on the garbage disposal (if fitted), a dedicated drain tailpiece under the sink, or an air gap fitting. The drain hose must be configured with a high loop, typically secured under the benchtop, to prevent sink water from siphoning back into the dishwasher.
Plumbing Regulations
In most Australian states, homeowners can perform minor plumbing work like connecting flexible hoses to existing points. However, installing new water supply lines, modifying drain configurations, or any work involving fixed plumbing typically requires a licensed plumber. Check your local regulations and ensure any work complies with the Plumbing Code of Australia.
Water Pressure
Dishwashers require water pressure between 100-1000 kPa. Most Australian homes fall within this range, but very old properties or those on tank water may have low pressure. If you experience issues, a plumber can assess and address pressure problems.
Electrical Requirements
Electrical safety is paramount, and in Australia, electrical work must be performed by a licensed electrician. Never attempt DIY electrical installation.
Power Requirements
Most dishwashers require a standard 10-amp power point. Larger or premium models may require 15 amps. The power point is typically located in the adjacent cabinet or at the back of the dishwasher cavity. Some installations use a hardwired connection instead of a plug.
Safety Switch Protection
Australian electrical regulations require residual current devices (RCDs or safety switches) on power circuits in wet areas like kitchens. Your dishwasher circuit should be protected by an RCD. If your home lacks RCD protection, an electrician should install one during dishwasher installation.
Circuit Capacity
Ideally, a dishwasher should be on a dedicated circuit, especially if other high-draw appliances like kettles or microwaves share the kitchen circuit. An electrician can assess your existing circuits and recommend whether a new circuit is needed.
Step-by-Step Installation Overview
While a licensed professional should handle electrical connections, understanding the overall process helps you prepare and ensures nothing is overlooked.
Before Installation
- Remove the old dishwasher if replacing. Turn off water and power first
- Clean the cavity and inspect for any damage or pests
- Check that plumbing and electrical points are in good condition
- Verify that the new dishwasher fits the space
Setting Up the Dishwasher
- Adjust the feet so the dishwasher will be level when positioned
- Carefully slide the dishwasher into position, guiding hoses and power cord
- Connect the water supply hose to the inlet valve and the supply point
- Configure the drain hose with proper high loop and connect to drain
- Have an electrician connect or verify the electrical connection
- Check levelling with a spirit level and adjust feet as needed
- Secure the dishwasher to adjacent cabinetry if required
Testing
- Turn on water supply and check all connections for leaks
- Restore power and ensure the dishwasher powers on
- Run a short cycle and observe for proper filling, washing, and draining
- Check again for leaks during and after the cycle
- Verify proper drainage with no water remaining in the tub
Save Your Documentation
Keep installation receipts, warranty cards, and compliance certificates. Professional installation may be required to validate the warranty. Store the user manual for future reference.
When to Hire Professionals
Certain situations definitely require professional assistance.
Always Use Professionals For
- Electrical work: A licensed electrician must handle all electrical connections. This is not optional in Australia
- New plumbing points: Installing new water supply lines or drain connections requires a licensed plumber
- Gas work: If moving gas lines for dishwasher placement, a licensed gas fitter is required
- Integrated installations: Custom cabinetry work may require a kitchen fitter or cabinet maker
Consider Professional Help For
- First-time installations where no existing connections exist
- Installations requiring cabinetry modifications
- Situations where you're unsure about any aspect
- Warranty-required professional installation
Cost Considerations
Installation costs vary depending on complexity and location.
Typical Installation Costs
- Simple replacement: $100-200 for plumber connection if existing points are suitable
- Electrical point installation: $150-300 for new power point by electrician
- New installation from scratch: $300-600 or more including plumbing and electrical
- Retailer installation packages: Many retailers offer installation for $100-200 when purchasing a dishwasher, though this may not include electrical work
Bundled Services
Major appliance retailers like The Good Guys, Harvey Norman, and Appliances Online often offer installation packages when you purchase a dishwasher. These typically include delivery, removal of your old unit, and connection to existing plumbing and electrical points. Review what's included and what incurs additional charges.
Common Installation Problems
Knowing potential issues helps you avoid them or identify them quickly.
- Leaks: Usually from loose hose connections or damaged seals. Check all connections after installation
- Drainage issues: Often caused by improper drain hose configuration. Ensure the high loop is present
- Noise and vibration: Typically from poor levelling or inadequate securing
- Door alignment: Especially with integrated units, the door panel may need adjustment
- Insufficient water flow: May indicate a partially closed valve or kinked supply hose
Maintaining Your Installation
After installation, periodic checks ensure everything remains in good order:
- Regularly inspect supply and drain hoses for wear or bulging
- Check for any signs of leaks under the sink
- Ensure the dishwasher remains level over time
- Clean around the door seal to prevent debris buildup
- Periodically confirm mounting brackets remain secure
Proper installation sets the foundation for years of reliable dishwasher operation. Taking time to prepare correctly and engaging appropriate professionals for electrical and complex plumbing work ensures safety, compliance, and optimal performance of your new appliance.