Dishwasher Installation Cost in 2026
Replacing an existing dishwasher costs $150–$300 in labor. Adding one where there was none starts at $300. Here is the full breakdown.
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Replacing an Existing Dishwasher
If your kitchen already has a dishwasher, swapping it for a new one is the simplest scenario. The installer reuses the existing water supply valve, drain hose connection, and electrical connection. No plumber or electrician is needed.
First-Time Installation: Adding a Dishwasher Where There Was None
This is a fundamentally different — and more expensive — project. You need to run a new hot water supply line, a new drain connection, and a dedicated 120V/20A electrical circuit. In most jurisdictions, this requires a licensed plumber and a licensed electrician.
| Cost Item | Low | High | Notes |
|---|---|---|---|
| Plumber: supply line | $150 | $300 | Hot water line from under-sink valve |
| Plumber: drain connection | $100 | $200 | To disposal or P-trap |
| Electrician: 20A circuit | $200 | $500 | Dedicated circuit required |
| Installation labor | $150 | $300 | Connecting unit to completed hookups |
| Permits | $50 | $250 | Plumbing + electrical |
| Labor total (no unit) | $650 | $1,550 | All trades combined |
Every Dishwasher Needs Three Connections
Understanding these three connections explains why replacement is cheap and new installation is expensive.
Hot Water Supply Line
A braided stainless supply line runs from a shut-off valve (usually under the sink) into the dishwasher. Replacement: reuse existing valve. New install: plumber taps into hot water line.
Drain Hose
The drain hose must loop high (a 'high loop') before connecting to the garbage disposal knockout or P-trap drain. This prevents backflow. An air gap fitting is required in some states.
Electrical Connection
Dishwashers require a dedicated 120V/20A circuit. They must not share a circuit with other appliances. Most homes built after 1980 already have one under the sink cabinet.
Who Installs Dishwashers? Your Options Compared
You have five main options for installation. Cost and flexibility vary considerably.
Retailer Installation at a Glance
| Retailer | Basic Install Cost | Haul-Away | Requirement |
|---|---|---|---|
| Home Depot | $99–$150 | Free with purchase | Must purchase dishwasher from Home Depot |
| Best Buy | $179.99–$209.99 | $15 extra | Must purchase dishwasher from Best Buy |
| Lowe's | $199–$269 | Usually included | Must purchase dishwasher from Lowe's |
Common Installation Problems (and What They Cost)
Corroded supply valve
+$75–$200Old stop valves often corrode and fail when turned after years of disuse. A plumber replaces the valve — do not attempt this DIY.
No dedicated electrical circuit
+$200–$500Older homes sometimes lack a dedicated 20A circuit under the sink. A licensed electrician must add one before installation can complete.
Size mismatch (24" vs 18")
$0–$300Always measure your cabinet opening before purchasing. Standard is 24 inches wide. Forcing an 18" unit into a 24" space requires a filler panel.
Granite / stone countertop
+$50–$200Stone countertops can't be drilled from the top. Side-mount brackets are required — make sure your installer brings them.
Old disposal without dishwasher port
+$150–$350If your disposal predates common dishwasher use, it may lack the dishwasher drain knockout. Easier to replace the disposal at the same time.
Height adjustment issues
$0New dishwashers must sit level and fit snugly under the counter. Adjustable legs solve most issues; no extra cost if done properly.
More Dishwasher Installation Guides
Frequently Asked Questions
How much does it cost to install a dishwasher?
Replacing an existing dishwasher costs $150–$300 in labor (installer reuses your connections). A first-time installation where no dishwasher existed starts at $300–$700 for labor, or $700–$2,000 total including the dishwasher unit. Adding a dishwasher to an older home where walls need opening can reach $1,500–$3,200.
How much does Home Depot charge for dishwasher installation?
Home Depot charges $99–$150 for basic installation when you purchase the dishwasher from them. This covers a standard swap with existing connections. New plumbing or electrical work is outside their scope — they'll refer you to a licensed contractor for those.
Can I install a dishwasher myself?
Yes, for a straight replacement. Swapping an old dishwasher for a new same-size model is DIY-friendly: turn off water and power, disconnect the old unit (3 connections), slide out, slide in new unit, reconnect the same 3 lines, test. Total time: 1.5–2 hours. Do not DIY a new installation from scratch — this requires licensed plumbing and electrical work.
Does installing a dishwasher require a plumber?
Not for a straight replacement. For a new installation (kitchen never had a dishwasher), a licensed plumber is required to run the supply line and drain connection in most states. An electrician is needed for the new dedicated circuit.
Do I need a permit to install a dishwasher?
Rarely for a replacement. Yes for new plumbing or electrical circuits in most jurisdictions. Permit costs: plumbing $50–$150, electrical $75–$200. Your plumber and electrician will typically pull permits on your behalf — confirm this when getting quotes.
What size dishwasher do I need?
Standard: 24 inches wide (fits standard 24" cabinet opening). Compact/slimline: 18 inches. Measure your cabinet opening width, height clearance, and depth before purchasing. In tight kitchens, depth can be a surprise constraint — standard dishwashers are 24 inches deep.