Installing a Garbage Disposal
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Replacing an existing garbage disposal is a straightforward swap: disconnect, untwist, twist the new one on, reconnect. Installing one for the first time is slightly more involved because you need to modify the drain plumbing and add an electrical connection. Either way, it is a manageable project for someone comfortable with basic plumbing and a screwdriver.
Cost Breakdown
Disconnect & Remove
Removes the electrical cover plate and loosens hose clamps.
Holds the drain fitting while loosening the slip nut. Channel-lock pliers are best for plumbing work.
Fits the disposal wrenchette slot on the bottom. Frees jammed disposals and helps with removal.
Confirm the circuit is dead before disconnecting the electrical wiring.
Install
Tightens the mounting ring and drain connections.
Apply plumber's putty around the sink flange. Creates a watertight seal.
Strip the electrical wire ends for the disposal wiring connections.
Consumables and Supplies
These get used up during the project. Always buy these new.
- Garbage disposal unit 1/3 HP for light use (1-2 people). 1/2-3/4 HP for typical households. 1 HP for heavy use.
- Plumber's putty Seal the sink flange. Apply a rope of putty around the flange before setting it in the sink hole.
- Wire nuts For the electrical connections inside the disposal wiring compartment
- Pipe fittings You may need a new P-trap or tailpiece if the new disposal sits at a different height than the old one
Safety Gear
- Safety glasses
- Work gloves
Before You Buy Anything
Check if your neighbors already have the tools you need. Borrowing saves money, saves storage space, and keeps tools in use instead of collecting dust.
See how FriendsWithTools worksCommon Questions
Can I install a disposal if I do not have one currently?
Yes, if you have an electrical outlet or switch under the sink (or can add one). You will also need to replace the sink drain fitting with a disposal-compatible flange and modify the drain plumbing to accommodate the disposal body. It is more work than a replacement but still a half-day project.
Do I need an electrician?
If there is an existing outlet or hardwired connection under the sink from the old disposal, no. You are just reconnecting wires. If you need to add a new circuit or outlet, that is a job for an electrician unless you are comfortable with electrical panel work and local code allows homeowner wiring.