Garbage Disposal Replacement — Complete DIY Guide
A garbage disposal replacement costs $200-$625 with professional installation, or $75-$200 if you handle the swap yourself. Most homeowners finish a same-mount replacement in under two hours. This guide covers when replacement makes sense, what to buy, and how to get the job done.
If the disposal leaks, grinds poorly, or just stopped running, this page points you to the right resource. For general garbage disposal troubleshooting, start there if you are not sure replacement is the answer.
Is This Guide for You?
This guide is for you if:
- Your disposal is leaking from the bottom (internal seals have failed)
- The unit is 8+ years old and having repeated problems
- The motor hums but the flywheel spins freely (burned motor winding)
- A repair quote came in higher than $150
- You want to upgrade to a more powerful or quieter model
This guide is NOT for you if:
- Your disposal just stopped working — try the reset button fix first
- The disposal hums and feels stuck — see our guide for a disposal not working
- You only need to know the price — jump straight to repair and replacement costs
Should You Repair or Replace?
The age of your disposal determines whether repair makes financial sense. We built this decision matrix using pricing data from HomeAdvisor, Angi, and plumber rate surveys for 2025-2026.
| Disposal Age | Recommendation | Why |
|---|---|---|
| Under 5 years | Repair | Unit has years of life left; most repairs cost $70-$175 |
| 5-10 years | Repair if under $150 | Borderline territory; weigh repair cost against a new unit |
| Over 10 years | Replace | Repair costs approach new-unit prices; failure risk increases |
Always replace if:
- The disposal leaks from the bottom near the reset button. This means the internal seals have corroded through, and no amount of tightening or putty fixes an internal seal. Learn more in our leaking disposal guide.
- The housing is cracked or visibly corroded.
- The motor runs but produces no grinding action (burned windings).
Always repair if:
- The issue is a jam (stuck flywheel) — a 1/4-inch Allen wrench fixes this in two minutes.
- The reset button tripped — press it and test.
- A connection is dripping — tighten or replace the gasket.
Average repair runs $70-$400 depending on the problem. A full replacement (unit plus professional installation) averages $300-$450. At the 8-10 year mark, those numbers overlap enough that replacement makes more sense. See the full repair and replacement costs breakdown for specifics by problem type.
Choosing the right replacement
Three brands dominate the residential market. InSinkErator holds roughly 70% of US installations, with Waste King and Moen splitting most of the remainder.
| Factor | InSinkErator | Waste King | Moen |
|---|---|---|---|
| Best for | Reliability, widest compatibility | Budget value, long warranties | Quiet operation |
| Price range | $80-$400 | $75-$291 | $100-$350 |
| Motor type | Induction (1725 RPM, high torque) | Permanent magnet (2600+ RPM, faster) | Permanent magnet |
| Max warranty | 8 years | 20 years | 10 years |
| Mounting | 3-bolt Quick Lock | EZ Mount twist-lock | Universal Xpress |
Mounting compatibility matters. Check what mounting system your current disposal uses before buying. A same-mount swap skips the hardest part of installation. InSinkErator’s 3-bolt Quick Lock is the most common. Waste King uses the EZ Mount twist-lock. If you switch between mounting types, you need to replace the flange and mounting assembly too — see our flange replacement guide.
HP sizing by household:
- 1/2 HP — Sufficient for 1-2 people with light use. InSinkErator Badger 5 at $80-$120 is the most recommended budget option.
- 3/4 HP — Best for families of 3-4. Handles most food waste without jamming. Waste King L-3200 runs $100-$150 with an 8-year warranty.
- 1 HP — Heavy-use households or anyone who grinds fibrous foods regularly. The Waste King L-8000 at $150-$200 carries a 20-year warranty — no other brand comes close.
All major brands use the standard 3.5-inch drain opening, so sizing is not a concern.
Installation overview
A DIY garbage disposal replacement is a 1-2 hour job for most homeowners, according to both manufacturer guides and community consensus. The basic process: disconnect power and plumbing, unmount the old unit, mount the new one, reconnect everything, and test.
Tools you will need:
- 1/4-inch Allen wrench
- Channel-lock pliers
- Screwdriver (flathead and Phillips)
- Plumber’s putty
- Bucket and towels
DIY installation saves $80-$200 compared to hiring a plumber. For the full procedure with each step detailed, see our step-by-step installation guide.
Dishwasher connection: If your dishwasher drains through the disposal, you need to remove the knockout plug on the new unit before mounting it. This is the single most common mistake during disposal replacement. See the dishwasher knockout plug guide for details.
Video guide
Video: “How to Replace a Garbage Disposal - Easy, Step-by-Step” by LRN2DIY
Common replacement issues
A few things can go wrong during the swap. Here is where to find help for each:
Flange problems. If the old plumber’s putty is dried and cracked, or the mounting assembly is corroded, you will need to remove and replace it. This adds 30-45 minutes to the job. Our flange replacement guide walks through the process.
Splash guard. The rubber baffle inside the drain opening wears out over time. It cracks, stiffens, and traps bacteria that cause odor. A replacement costs $4-$12 and snaps in by hand. See the splash guard replacement guide.
Dishwasher backup. If the dishwasher stops draining after installing a new disposal, the knockout plug was not removed. This is a 2-minute fix if you catch it before fully mounting the unit. Details in the dishwasher knockout plug guide.
FAQ
How long does it take to replace a garbage disposal?
A same-mount replacement takes 30-90 minutes for a DIY homeowner, depending on how accessible the area under the sink is. A professional plumber typically finishes in 1-2 hours, including cleanup. Switching mounting types (for example, from EZ Mount to 3-bolt) adds time because the flange and mounting assembly must be replaced.
Can I replace a garbage disposal myself?
Yes, if you are replacing an existing unit with the same mounting type and the electrical outlet is already in place. The job requires basic tools — pliers, a screwdriver, and plumber’s putty. New installations that require running electrical wiring should be handled by a licensed electrician.
Do I need a plumber or an electrician?
For a straight swap (old unit out, new unit in, same wiring), a plumber handles it. If the disposal is hardwired and you are uncomfortable with electrical connections, or if no outlet exists under the sink, call an electrician for the wiring and a plumber for the disposal. Professional labor runs $80-$200 on top of the unit cost.
How much does a plumber charge to replace a garbage disposal?
Plumber rates for disposal replacement range from $150-$400 total, including both the unit and labor. The labor portion is $80-$200, with most jobs taking 1-2 hours. Weekend or emergency calls carry a 1.5x-2x premium. Buying the disposal yourself and hiring a plumber just for installation can save $30-$50 on the unit markup.