Can I Install a Dishwasher Myself?

Last Revised: 7/15/25 

If you’re buying a dishwasher – or already have – the installation fees may have you wondering: Is this something I can handle myself? Or is it worth paying a pro to make sure it’s done right? 

Either way, you’re alone. Many homeowners question if skipping professional installation is a smart way to save or a costly mistake waiting to happen.  

At Mattioni, we’ve spent over 75 years helping homeowners make confident decisions about their homes. We believe that when you’re equipped with real knowledge, you’re empowered to choose what’s right for your home, your budget, and your peace of mind. 

In this article, you’ll learn: 

• What’s really involved in dishwasher installation 
• A clear, step-by-step DIY breakdown 
• Common pitfalls and how to avoid them 
• How to know when to call in a professional 

Whether you’re a seasoned DIYer or just trying to avoid unexpected expenses, this article will help you make the right call – and ensure your new dishwasher runs safely and smoothly. 

Let’s Start with the Honest Answer: Yes, You Could – But Should You? 

Installing a dishwasher isn’t as challenging as some other home improvement projects – but it does require some skill. You’ll be working with plumbing connections, electrical wiring, and a heavy appliance that needs to be level and leak-free.  

If that sounds like a Saturday well spent, then there are plenty of online resources available (think YouTube) to get the ball rolling. But if the thought of it sparks hesitation, that’s a sign to pause and evaluate your skillset honestly.  

Here’s the truth: many homeowners can do this themselves if the existing setup is compatible, they’re comfortable with tools, and have experience troubleshooting. But DIY isn’t the right choice for everyone – and that’s not a failure; it’s just smart homeownership. 

How to Install a Dishwasher 

For those who are confident in their skills, here is the process to follow – which starts with having the right tools for the job (and plenty of patience). 

What You’ll Need (And Why It Matters) 

Before unboxing your new dishwasher, here’s what should be in your toolkit: 

• An adjustable wrench, screwdriver, bucket, and towels 
• Your dishwasher’s install kit (which should include a water line, drain hose, and 90° elbow fitting) 
• Plumber’s tape, a voltage meter, and a level 
• Patience and some physical flexibility – you may need to work in a tight space 

Each piece has a purpose. If you miss a part or a step (like properly sealing the drain line), you could end up with leaks behind your cabinets – or worse, damage to your flooring and electrical system. So, make sure to double check your workmanship after each of the following steps.  

Step-by-Step: How to Install a Dishwasher 

Installing a dishwasher for the first time? Don’t worry – we’ve broken it down into manageable steps, with clear explanations. Remember to take it slow, stay safe and pause whenever something doesn’t look or feel right. 

1. Turn Off The Power and Water

Before you touch anything, locate your home’s electrical panel and shut off the breaker that controls the dishwasher circuit. Then, turn off the water supply – usually a small valve under the kitchen sink. 

You’ll be disconnecting wires and pipes, so turning everything off prevents shocks and leaks. Use a voltage meter to double-check there’s no power flowing to the wires before handling them. 

2. Remove the Old Dishwasher

Open the cabinet next to the dishwasher. Inside, you’ll find: 

• A water supply line (usually a flexible braided hose) 
• A drain hose (connected to your garbage disposal or sink drain) 
• An electrical junction box (often at the front-bottom of the old unit 

Disconnect all three. You may need a wrench to loosen the fittings. Then, unscrew the mounting brackets holding the dishwasher in place and gently slide it out. Pay attention to how each connection looks as it’s beneficial to know how your home is plumbed and wired. 

It’s also smart to keep those towels (and a bucket) handy – some water is likely to spill out from the hoses. 

3. Prepare The New Dishwasher for Installation

Gently lay the new dishwasher on its back to make connections easier. Attach: 

• A 90° elbow fitting to the water inlet valve 
• The water supply line to the elbow 
• The drain hose to the dishwasher’s drain pump 

The elbow fitting is essential to keeping the water line from kinking when the dishwasher is upright. Also, using plumber’s tape on threaded fittings at this point can prevent future leaks. 

4. Position and Level the Dishwasher

Carefully slide the new unit into the opening, feeding the water line, drain hose, and power cord through the hole in the cabinet wall. Don’t force it – take your time with it. Once in place, use a level to check that the unit is straight and adjust the leveling feet if needed.  

A level dishwasher ensures proper draining and prevents noisy operation or door sealing issues. 

Pro Tip: Leave the front of the dishwasher accessible for now – you may need to pull it out slightly to adjust connections. 

5. Connect The Water, Drain, and Power

Follow each of these steps to ensure that each line is properly installed: 

• Water line: Tighten the supply hose to the shutoff valve under the sink. 
• Drain hose: Attach it to your sink drain or garbage disposal. Make sure it loops upward – either with a “high loop” or air gap – to prevent dirty water from backflowing. 
• Electrical: Follow the manufacturer’s instructions to either hardwire the unit or plug it into an outlet. 

Each of these connections must be secure (but not overtightened) and correctly routed to prevent flooding, fire risks, or health hazards. 

6. Test The Dishwasher

Once everything is connected, restore power and water. Run a short cycle, and while it’s running: 

• Check under the sink for leaks at the water or drain lines 
• Listen for unusual noises 
• Watch the dishwasher to ensure it fills, drains, and heats properly 

Catching issues early lets you fix them before they cause damage, so diligently check connections for leaks before officially checking “install the dishwasher” off your To-Do List. 

What Could Go Wrong – And How to Spot it Early 

Even with a careful, step-by-step approach, it’s normal to feel a bit unsure the first time you install a major appliance like a dishwasher. And it’s possible that a few issues can sneak in. The good news? Most are easy to catch and fix – if you know what to look for. 

• Small leaks – Usually caused by loose fittings or missing plumber’s tape. Turn off the water, reseal threads, and retighten gently. 
• Drain problems – Your drain hose might be kinked. Make sure it arches upward before connecting it to the sink or disposal. 
• No power or tripped breaker – Likely a wiring misstep. Double-check connections in the junction box or call a licensed professional if unsure. 
• Tilted or misaligned unit – Grab a level and adjust the dishwasher’s legs until it’s even on all sides. This improves draining and prevents movement. 

These issues are all relatively minor – and fixable – especially if you take your time to double-check your work. But if something’s still off, don’t guess. Mattioni is always here to help. 

When to Call a Professional Plumber 

If you’ve made it through the install – or even just partway – you deserve a lot of credit. This isn’t a small job. But if you’re at a point where you’re unsure of whether you’re ready to take on the project, or continue it, it’s okay to call in some backup.  

Sometimes calling a professional isn’t about what you can’t do – it’s about what’s worth your time and your peace of mind. 

Here’s when it’s smart to get some assistance: 

• You’ve double-checked connections but still have leaks or poor drainage 
• The dishwasher isn’t powering on and you’re unsure about wiring  
• You’re working with an older home and aren’t confident about code compliance 
• The install is done, but you want someone to inspect and verify everything is safe 

At Mattioni, we’ve handled countless dishwasher installations with care and precision. Whether you need a rescue mid-project or just want the job done right from the start, our licensed techs ensure your new unit runs clean, safe, and leak-free. 

No stress. No second guesses. Just expert support – when you need it most. 

Final Thoughts: A Confident DIY – or a Trusted Partner 

Installing a dishwasher yourself can be a rewarding project – if you’re prepared and the conditions are right. With the right tools, a steady approach, and attention to detail, some homeowners can handle it successfully.  

But if you’re facing unexpected snags, want to ensure your investment is protected, or simply prefer the peace of mind, calling a professional is a smart move. 

At Mattioni, we’ve spent over 75 years earning the trust of our customers. We don’t just install appliances – we help people protect their homes, their time, and their confidence in the systems they rely on every day. 

Whether you’re just starting your project or looking for help with a tricky step, we’re here to guide you – without pressure.  

Are you ready for a professional dishwasher installation? Contact Mattioni’s friendly team today at (610) 400-8510 or schedule service online to get your job done right, right away.