How Do I Replace My Garbage Disposal?

Carbonetheplumber.com/wp-content/uploads/2025/09/iStock-484745695-scaled.jpg”>Carbonetheplumber.com/wp-content/uploads/2025/09/iStock-484745695-300×198.jpg” alt=”Man installing garbage disposal in home” width=”300″ height=”198″ srcset=”https://Carbonetheplumber.com/wp-content/uploads/2025/09/iStock-484745695-300×198.jpg 300w, https://Carbonetheplumber.com/wp-content/uploads/2025/09/iStock-484745695-1024×675.jpg 1024w, https://Carbonetheplumber.com/wp-content/uploads/2025/09/iStock-484745695-768×506.jpg 768w, https://Carbonetheplumber.com/wp-content/uploads/2025/09/iStock-484745695-1536×1012.jpg 1536w, https://Carbonetheplumber.com/wp-content/uploads/2025/09/iStock-484745695-2048×1350.jpg 2048w, https://Carbonetheplumber.com/wp-content/uploads/2025/09/iStock-484745695-1568×1033.jpg 1568w, https://Carbonetheplumber.com/wp-content/uploads/2025/09/iStock-484745695-150×99.jpg 150w” sizes=”(max-width: 300px) 100vw, 300px”>If your garbage disposal is leaking, making strange noises, or constantly jamming, a replacement might be the smartest fix. Repairs can be costly and unreliable, especially if your unit is aging. In this guide, we’ll walk you through how to replace your garbage disposal safely, including the tools you’ll need, step-by-step instructions, and when it’s time to call a pro. Whether you’re tackling it yourself or just want to understand the process, Carbone The Plumber Heating & Air has you covered.

What Tools & Materials Do I Need to Replace a Garbage Disposal?

Before you dive into a DIY garbage disposal replacement, make sure you have the right tools and parts on hand. Having everything ready will make the job go smoother and help you avoid delays or mid-project hardware store runs.

Tools

Screwdriver
Wrench
Channel-lock pliers
Safety gloves
Wire nuts
Bucket
Plumber’s putty

Parts & Materials

New garbage disposal unit: Make sure to match the horsepower and mounting type of your current system.
Mounting hardware: This is included with most new units.
Electrical connectors or power cord: Check to see if you can reuse your existing one.
Discharge tube parts and rubber gasket: These may be included with your new unit, or might need to be purchased separately.

How Do I Prepare Before Replacing the Disposal?

It only takes a few minutes to prepare your workspace, but it can help you avoid safety risks and mess.

Turn off power: Shut off the disposal’s circuit breaker at the panel to eliminate electrical hazards.
Turn off water: Locate the shut-off valve under the sink and stop the water supply.
Place towels or bucket: Put towels or a bucket beneath the unit to catch any water or debris during removal.
Safety first: Make sure your tools are insulated, and wear gloves and safety goggles to protect your hands and eyes.

What Are the Steps to Remove the Old Garbage Disposal?

Removing your old unit is straightforward with the right approach:

Disconnect the power by unscrewing the cover plate and separating the electrical wires.
Use pliers to detach the discharge tube from the disposal.
If your garbage disposal is connected to a dishwasher, remove the drain hose.
Support the unit with one hand while using your other hand (or the provided wrench) to rotate the mounting ring counterclockwise to release the disposal from the sink flange.
Unscrew the mounting assembly from beneath the sink and push the sink flange up and out.
Scrape off any old putty or debris left around the drain opening.

How Do I Install the New Garbage Disposal?

Installing your new disposal is a reverse of the removal process, with a few extra steps for sealing and wiring:

Apply plumber’s putty around the new sink flange.
Drop the flange into the sink drain, then go beneath the sink to install the rubber gasket, backup flange, and mounting ring. Tighten evenly to secure.
Mount the new disposal by aligning its tabs with the mounting ring, then twist to lock it into place.
Install the discharge tube and connect it to the household drain trap.
Connect the dishwasher hose (if applicable), making sure to remove the plug inside the disposal inlet first.
Wire the electrical supply according to the manufacturer’s diagram—typically connecting hot, neutral, and ground wires—then secure the cover plate.

How Do I Test & Finish the Replacement?

Before you call the job done, follow these steps to make sure everything is operating as it should:

Restore power at the breaker, but keep the switch off for now.
Run cold water into the sink, then turn on the disposal. Check for any leaks around the flange, discharge pipe, or dishwasher hose.
Listen for odd sounds, vibrations, or humming that could indicate installation issues.
Confirm smooth operation, including proper drainage and grinding.
Clean up excess plumber’s putty and double-check that all connections are tight.

What Are the Costs & When Should I Call a Pro?

DIY disposal replacement usually costs $150–$450 for parts and materials. It’s manageable if you’re swapping similar units in an easy-to-access space. But if the job involves electrical work, tight quarters, or plumbing updates, it’s safer to call a professional. Mistakes like improper wiring or loose seals can lead to leaks, damage, code violations, and safety issues. When in doubt, trust Carbone The Plumber Heating & Air to handle your garbage disposal replacement safely and efficiently.

Frequently Asked Questions

How long does a garbage disposal typically last?

Most garbage disposals last eight to 12 years, depending on usage, maintenance, and how well they are installed. If yours is beyond that, replacement often makes sense.

Can I replace a garbage disposal myself, or do I need a plumber or electrician?

Yes, many homeowners with basic DIY skill can handle it—as long as the electrical wiring is straightforward, the space allows access, and you follow safety precautions. But call a pro if you’re unsure, need to run wiring, or encounter complex plumbing.

What size or horsepower disposal do I need?

Choose based on household size, how often you cook, and what kind of food waste you grind. For most households, ½ HP works well; larger households or heavier use might need ¾ – 1 HP.

How much does it typically cost to replace a garbage disposal?

Depending on model and features, units plus parts can run from $150 to $400. If hiring a professional installer, add in labor costs.

What are the most common mistakes when replacing a disposal?

Not shutting off power properly.
Forgetting to remove the dishwasher knockout plug.
Overusing plumber’s putty or not cleaning up excess.
Incorrect alignments on the mounting ring resulting in leaks.
Loose electrical connections or no ground.

Request Garbage Disposal Replacement

If your garbage disposal is on its last legs, don’t wait until your sink is clogged. Carbone The Plumber Heating & Air offers fast, professional Carbonetheplumber.com/plumbing/garbage-disposal-repair-replacement/”>garbage disposal installation with no surprise fees and expert workmanship you can trust. Whether you’re in the middle of a kitchen remodel or just need a quick replacement, we’re here to help across the Mid-Atlantic region.

Carbonetheplumber.com/schedule-appointment/”>Book garbage disposal replacement online or call Carbone The Plumber Heating & Air today!