Garbage Disposal Installation Cost (2026): Replacement vs First-Time Install

Garbage disposal installation is a quick flat-rate job as a like-for-like replacement, and a larger job as a first-time install that needs an outlet, a switch, and drain-plumbing changes under the sink.

What does garbage disposal installation cost?

Replacing an existing disposal with a compatible unit runs $120 to $300 in labor. Supplying a mid-grade 3/4 HP unit plus install runs $250 to $500. A first-time install adding an outlet, an air switch or wall switch, and reworking the drain runs $400 to $900.

What does a first-time install add?

• Electrical: a switched outlet under the sink, often a new circuit or a tap with a switch
• Drain reconfiguration: a new continuous waste arm, a dishwasher connection, and sometimes a change from a center to an offset drain
• A basket-strainer removal and mounting-flange install on the sink
• An air switch through the countertop or a wall switch if no outlet-switch is wanted

What should you check before quoting a replacement?

Mounting-collar compatibility (some brands share a mount, some do not), whether the dishwasher drains through the disposal, and the condition of the existing outlet and switch. A photo under the sink answers most of it.

What belongs in the estimate?

The unit and horsepower, mounting hardware, the drain and dishwasher connections, electrical work if any, haul-away of the old unit, and a leak and function test. Note that if the sink flange is corroded or the drain layout is non-standard, additional parts and time apply at a stated rate.

Example: first-time disposal install

Line item	How it's priced	Example
3/4 HP disposal	Cost + markup	$210
Install and mount	Flat labor	$180
New switched outlet under sink	Electrical flat rate	$220
Drain rework and dishwasher connection	Flat or hours	$140
Leak and function test, cleanup	Included	$0
Total		$750

Illustrative numbers only. Use your own rates, production times and local costs.

Questions to ask before quoting

• Is there an existing disposal? What brand?
• Is there an outlet under the sink, and is it switched?
• Does the home have a septic system? Some disposals are better suited to septic use, and some homeowners prefer to avoid them.
• Is there a dishwasher, and does it drain through the sink?
• Can they send a photo of the cabinet under the sink?

Local rules on electrical and plumbing work vary. Note who performs the electrical portion if a new circuit or outlet is needed.

Frequently asked questions

How much does it cost to replace a garbage disposal?

A like-for-like replacement commonly runs about $120 to $300 in labor, or about $250 to $500 with a mid-grade unit supplied.

Why does a first-time disposal install cost more?

It usually needs an outlet and switch under the sink and changes to the drain, which adds electrical and plumbing time.

What size garbage disposal should I install?

Many households use a 1/2 to 3/4 HP unit. Larger families or heavy cooks may want 1 HP. Match the unit to how the customer uses it.