Do Plumbers Install Dishwashers?

You've picked out a new dishwasher, and now you're wondering who should put it in. Can a plumber do it, do you need an electrician, or is it a weekend DIY job? Here's what the installation involves and who handles each part.

Quick answer: Yes, plumbers install dishwashers. A plumber handles the water supply line, shutoff valve and drain connection, which are the parts most likely to leak or cause drainage problems. If the dishwasher needs a new electrical circuit or outlet, that part may need a licensed electrician.

What a Plumber Handles in a Dishwasher Installation

• Water supply: connecting the hot water line, usually from a shutoff valve under the kitchen sink, and replacing an old or seized valve if needed.
• Drain connection: connecting the drain hose to the garbage disposal or the sink's drain tailpiece, with a high loop or an air gap so dirty sink water can't flow back into the dishwasher.
• Leak testing: running a cycle and checking every connection before the unit is pushed into place.
• New locations: running new supply and drain lines if the dishwasher is going where there wasn't one before, such as during a kitchen remodel.

When You May Also Need an Electrician

Most dishwashers plug into an outlet under the sink or are hardwired to a junction box. If the existing circuit and connection are already in place, the swap is simple. If you need a new dedicated circuit, a new outlet, or the wiring doesn't meet code, plan on a licensed electrician for that part of the job.

The Installation Process

1. Shut off the water and power to the old dishwasher. Here's how to shut off the water supply if there's no valve under the sink.
2. Disconnect and remove the old dishwasher, if there is one.
3. Check the shutoff valve, supply line, drain and electrical connection, and replace worn parts.
4. Connect the new supply line and the drain hose, with a high loop or air gap.
5. Make the electrical connection.
6. Slide the unit into place, level it, and secure it to the countertop or cabinets.
7. Run a full cycle and check for leaks and proper draining.

Common DIY Installation Mistakes

• No high loop or air gap: dirty water from the sink can flow back into the dishwasher, leaving standing water and odors. If that's already happening, see our guide to a dishwasher not draining.
• Forgetting the disposal knockout plug: on a new garbage disposal, the drain inlet is sealed with a plug that has to be knocked out before the dishwasher can drain into it.
• Kinked drain hose: pushing the unit back can pinch the hose and stop it from draining.
• Over- or under-tightened fittings: both can cause slow leaks under the cabinet that go unnoticed until the floor is damaged.
• Reusing an old supply line or valve: old valves often leak or won't fully close once they're disturbed.

Why Hire a Professional

• Fewer leaks: a slow leak under a dishwasher can rot the subfloor and cabinets before you notice it.
• Proper drainage: the correct drain connection and air gap keep wastewater out of the dishwasher.
• Code compliance: licensed plumbers know local code requirements for supply and drain connections.
• Warranty protection: some manufacturers require professional installation to keep the warranty valid.

Dishwashers are one of several fixtures where a licensed pro is worth it. See why it pays to hire a licensed plumber for fixture installation.

How to Choose the Right Plumber

• Confirm the plumber is licensed and insured in Nevada.
• Ask whether they handle dishwasher hookups and what's included in the price.
• Get a written estimate, and ask whether parts like a new supply line or shutoff valve are extra.
• Read recent reviews and ask whether the work is guaranteed.

For more, see our guide on how to find a good plumber.

Frequently Asked Questions

Do I need a plumber or an electrician to install a dishwasher?

Usually a plumber, for the water and drain connections. You only need an electrician if a new circuit or outlet is required or the existing wiring isn't up to code.

How long does a dishwasher installation take?

A straight replacement with existing connections often takes one to two hours. A new location with new supply and drain lines takes longer.

Can I install a dishwasher myself?

If the connections are already in place and you're comfortable with plumbing and electrical work, it's possible. Most problems come from the drain connection and fittings, so if you're unsure, have a pro handle those parts.

Need Help With a Dishwasher Hookup in Reno?

Easy Rooter Plumbing has served Reno, Sparks and Northern Nevada since 1979. If you need help with the water supply, shutoff valve or drain connection for a new dishwasher, or you're dealing with leaks or drainage problems after an install, call (775) 331-3636.