Dishwasher Installation Cost Calculator

Installation labor typically runs $150 to $600, with most straightforward replacements at $150 to $300 — the appliance itself ($400 to $1,500-plus) is separate. A simple swap of an existing unit is often $150 to $250, a new install where hookups already exist is $250 to $450, and a new install needing water and drain lines, a dedicated circuit, or cabinet work runs $450 to $900-plus. The dishwasher type, install type, countertop material, and the connections needed drive the number.

Yes, and the gap can be large. Replacing an existing dishwasher reuses the water supply, drain, electrical, and cabinet opening that are already there — the installer disconnects the old unit, slides in the new one, reconnects, levels, anchors, and tests. That's a quick, cheap job. A brand-new install where none existed has to create those connections — running a water line, a drain, and often a new dedicated circuit, plus cutting a cabinet opening — which adds plumbing, electrical, and cabinetry labor. The more connection work required, the higher the cost.

Three: a hot-water supply line (usually tapped off the sink's hot shutoff), a drain connection (to the sink drain, garbage disposal, or an air gap), and electrical power (a dedicated circuit, hardwired or plugged into a dedicated outlet). Plus the unit has to be leveled and anchored so it doesn't tip when the loaded door opens, and many codes require an air gap on the drain to prevent dirty water backflow. On a replacement these already exist; on a new install they all have to be created, which is why new installs cost more.

A standard 24-inch built-in and a compact 18-inch are the most economical to install because they drop into a standard opening and connect straightforwardly (~$230 to $250 labor). A panel-ready or integrated model costs more (~$450) because a custom cabinet panel has to be fitted and attached to match your cabinetry. A double-drawer dishwasher is the most involved (~$550). Note this is install labor only — the appliance price varies separately, and panel-ready and drawer units also tend to cost more to buy.

Because the dishwasher is usually anchored with brackets screwed into the underside of the countertop to keep it from tipping. Laminate is easy to drill and fasten into. Solid wood or butcher block adds a little (~10%) for careful drilling. Granite, quartz, and other stone tops are hard to drill and can crack if done wrong (~25% more) — installers often use side-mount brackets to the cabinets instead, which takes extra care. So the same dishwasher can cost more to install under a stone counter than a laminate one, purely from the mounting.

Replacing an existing dishwasher is a realistic DIY job if you're handy: shut off the water and power, disconnect and remove the old unit, slide in the new one, reconnect the water line, drain hose, and electrical, level and anchor it, and — critically — test thoroughly for leaks before you finish. A dishwasher leak can quietly ruin cabinets and flooring, so the connections have to be tight. New installs needing new plumbing, a dedicated circuit, or cabinet cuts are better left to a pro (and a new circuit may legally require an electrician and permit). Many retailers also install for a flat fee.

Often, yes. Most major appliance retailers offer installation with purchase — sometimes free as a promotion, sometimes a flat fee around $100 to $200 — and it frequently includes hauling away your old unit. The catch is that the basic install usually only covers a straight replacement onto existing hookups. New water or drain lines, an air gap, a new electrical circuit, a custom panel, or cabinet modifications typically cost extra or aren't covered, so you may need a separate plumber or electrician. Always ask exactly what's included before you rely on it.

An air gap is a small fitting mounted on the countertop or sink that prevents dirty drain water from siphoning back into the clean dishwasher — a backflow-prevention device. Many local plumbing codes require one; others accept a properly installed 'high loop' in the drain hose instead. If your area requires an air gap and you don't have one, it's added during the install (~$50). It's a small but code-important detail, so it's worth confirming which your jurisdiction requires. The calculator includes an air-gap add-on for where it's needed.

For a straight replacement onto existing hookups, usually not. But if the job involves new plumbing (a new water or drain line), or new electrical (a dedicated circuit), many jurisdictions require a plumbing and/or electrical permit and inspection to confirm the work meets code. New dedicated circuits in particular often trigger a permit and an electrician. A permit (~$120) also protects you at resale, since unpermitted plumbing or electrical work is a red flag for buyers. The calculator includes it as an add-on; a licensed pro will know the local threshold.

Replacing an existing dishwasher is quick — usually 1 to 2 hours to disconnect the old unit, slide in and connect the new one, level, anchor, and leak-test. A new install with new water, drain, and electrical connections, or cabinet modifications, takes much longer — a half-day to a full day — with a new dedicated circuit and any cabinet cutting being the time-consuming parts. Panel-ready models add a bit for fitting the custom panel. Corroded old fittings or a tight, non-standard space can stretch even a simple swap.