Dishwasher Installation Cost
Replacement vs new install, what is involved, DIY feasibility, and common problems to avoid.
Quick Answer
- Replacing existing dishwasher (labor only): $150 to $300
- New installation (no existing hookup): $300 to $700
- The dishwasher itself: $400 to $1,200
The big cost difference is whether hookups already exist. A first-time install in an older home is the expensive scenario.
Replacing vs New Installation
The type of job determines most of the cost.
Replacement (Existing Hookup)
Most common$150 to $300
Disconnect the old unit, slide it out, connect the new unit to the same water supply, drain, and electrical connections. Takes 1 to 2 hours.
- Water supply line already present
- Drain connected to sink drain or disposal
- Existing 120V outlet or hardwired connection
- Labor only if you supply the dishwasher
New Installation (No Hookup)
More expensive$300 to $700
Run a new water supply line from under the sink, install a drain line, and add a dedicated electrical circuit. Half a day of work, sometimes more in older homes.
- Plumber runs hot water supply line
- Drain taps into sink drain or garbage disposal
- Electrician adds circuit if no outlet exists
- May require opening walls in older homes
| Scenario | Labor | Time | Total (with dishwasher) |
|---|---|---|---|
| Replace existing (budget unit) | $150 to $300 | 1 to 2 hrs | $550 to $900 |
| Replace existing (mid unit) | $150 to $300 | 1 to 2 hrs | $850 to $1,400 |
| New install (hookups needed) | $300 to $700 | Half day | $700 to $1,500 |
| New install + electrical work | $500 to $1,200 | Full day+ | $900 to $2,000 |
What Is Involved
Every dishwasher installation needs three connections.
Water Supply
Hot water supply line (usually 3/8 inch braided line) runs from the hot water shutoff valve under the sink. The dishwasher heats water internally, but starting with hot water reduces cycle times.
Drain Line
Drain hose connects to the sink drain or garbage disposal. It must loop up high before coming back down (high loop) or use an air gap device to prevent contaminated water from flowing back into the dishwasher.
Electrical
Dishwashers require a dedicated 120V, 20-amp circuit. Most modern installations use a hardwired connection or a dedicated outlet in the cabinet below. Do not run it from a shared circuit with the garbage disposal.
DIY: Replacement Is Easy, New Install Is Not
The difficulty depends entirely on what already exists.
Swapping existing: DIY-friendly
- +1 to 2 hours total for most people on their first attempt
- +Watch one YouTube video for your specific model before starting
- +Tools needed: adjustable wrench, screwdriver, bucket, towels
- +Turn off the water supply valve under the sink before disconnecting anything
- +Turn off the circuit breaker, not just the dishwasher switch
New installation: hire a professional
- !Running a new water supply line requires basic plumbing skills and the right fittings for your pipe type
- !Adding a new electrical circuit requires a permit in most jurisdictions and must be done by a licensed electrician
- !Mistakes with water lines lead to leaks inside cabinets, which may go undetected until there is floor damage
- !Unpermitted electrical work can void homeowners insurance and create problems at resale
The rule of thumb: if a dishwasher was there before, swap it yourself and save $150 to $300. If there was never a dishwasher in that spot, budget for a plumber and possibly an electrician.
Common Installation Problems
Most installation headaches are preventable.
Wrong size
Standard dishwashers are 24 inches wide. Compact models are 18 inches. Measure the cabinet opening before purchasing. If the new unit is even a quarter-inch too wide, it will not slide in. Also check the height and depth if your kitchen has custom cabinetry or low counters.
Drain hose too long
If the drain hose sags or pools before reaching the sink drain, water sits in the line and causes standing water at the bottom of the dishwasher after a cycle. The hose must maintain a continuous slope or be secured in a high loop. Cut excess length rather than coiling it.
No air gap or high loop
Without a high loop or air gap device, sink water can siphon back into the dishwasher if the drain becomes clogged. Some local codes require a physical air gap (a small chrome fitting on the countertop or sink deck). Check your local plumbing code before skipping this step.
Door hits island or cabinet
Dishwasher doors drop fully open for loading. If there is an island, peninsula, or cabinet directly opposite, the open door may block the walkway or prevent the drawer below from opening. Measure the clearance with the door fully open before deciding on placement.
Frequently Asked Questions
How much does dishwasher installation cost?
Replacing an existing dishwasher costs $150 to $300 in labor. A new installation where no hookup exists costs $300 to $700. The dishwasher itself adds $400 to $1,200 on top of labor.
Can I install a dishwasher myself?
Swapping an existing dishwasher is a beginner-friendly DIY job that takes 1 to 2 hours. You disconnect the old water supply, drain hose, and power, then connect the new unit to the same hookups. Installing a dishwasher where none existed before requires plumbing and possibly electrical work, which is not DIY territory for most people.
Why does a new dishwasher installation cost so much more?
A first-time installation requires running a new water supply line, a drain line to the sink drain or garbage disposal, and a dedicated electrical circuit. In older homes without these hookups, the plumber or electrician may need to open walls. That is why $300 to $700 is common for new installs versus $150 to $300 for a straight swap.
What size dishwasher do I need?
Standard dishwashers are 24 inches wide and fit in a 24-inch cabinet opening. Measure your opening before buying. Compact and slimline models are 18 inches wide and will not fit a 24-inch opening without modification. Measure twice.