There are several types of professionals who can install a dishwasher, including appliance technicians, plumbers and skilled handymen.

However, whenever you’re looking to hire someone to work on your home's plumbing appliances, look for a pro who is licensed and certified in your area. They should also have insurance and a business license. Ask for that information before you start getting quotes from anyone. 

To get the best results from any plumbing project, you should also look for someone with a fair amount of experience, preferably a professional with good reviews or recommended by someone you trust. Find out if they have experience installing your specific dishwasher brand or type (such as front control, integrated, or panel-ready dishwashers). 

You can usually expect most simple dishwasher installations to cost approximately $145 to $300* for labor only. This is the national average cost according to the most recent Thumbtack data. 

Most plumbers charge for their time, sometimes with a call-out fee included in the quoted rate. Ultimately, the cost of installing a dishwasher is based on many factors, such as special parts, valves or pipes that might be required.

The biggest determining factor will be the time it takes to install the unit. Trouble installing the new unit or removing an old one could also increase the cost.

*Data on file at Thumbtack. For a personalized cost estimate, request a quote from a professional.

Dishwasher installation involves making safe connections for water and electric lines, which are critical for successful operation. The process typically includes the following:

• Taking measurements to ensure the dishwasher can fit into the cabinet opening.

• Sliding the new appliance into the opening without damaging connection lines.

• Hooking up the plumbing, including a PVC elbow to the water line inlet valve, the drain hose, the water line and the shutoff valve.

• Leveling the appliance and mounting stabilizing hardware to prevent vibration.

• Plug in the electrical power cord. Professional installers can often hard-wire electrical connections when necessary, too. 

• Running a test cycle to ensure the dishwasher is working properly.

You may be able to DIY this project if:

1. You’re very handy and have experience installing appliances.

2. You have all the necessary tools (like a screwdriver, adjustable wrench, pliers, a drill, a level and more). 

3. You know where to shut off your main water valve.

4. You have the time (usually up to four hours) to do the installation.

That said, there are lots of things that can go wrong with dishwasher installation. If you make a mistake, it could mean flooding in your home, electrical problems or damage to the dishwasher. Preparing plumbing and electrical systems can be complex, and some installations call for permitting or licensing. 

The bottom line: If you're not entirely confident that you know exactly what you're doing, it's probably best to leave this task to the professionals.

As far as plumbing jobs go, installing a dishwasher is usually one of the least invasive, and you can expect your plumber to work on the job for one to four hours. 

If your dishwasher installation needs more work, such as adjustments to cabinets or counters, or if changes need to be made to the pipes to allow for dishwasher installation, it may take longer. So always be sure to ask your plumber to provide a time estimate when they’re creating a quote. 

Remember: The timeline for your project will vary depending on many factors. Always ask your pro to provide an estimate.

Not sure if you really need to replace your dishwasher? Well, aside from the obvious — like a dishwasher that doesn’t work anymore or won't latch shut — any new or strange noises or smells from your dishwasher might indicate it's time for a new unit. If your dishes aren't coming out clean, and you've cleaned the filter and tried running the dishwasher with cleaner, that's another sign that you may need a new one. 

You might also need a new dishwasher if you've contacted a repair company and they either cannot get spare parts for your machine or the parts are special order items that cost a considerable portion of what a new dishwasher would cost. 

When in doubt, ask your pro to estimate the cost of repairs and the cost of replacing the dishwasher. If the cost of repairs is more than 50% of the cost to replace your unit, it may be worth just getting a replacement.