Garbage Disposal Installation Cost
Updated February 25, 2026
Replacing an existing disposal is a 30-minute DIY job. Adding a disposal to a sink that never had one costs more because you need an electrical connection and possibly a new drain configuration. Here is the full cost breakdown for both scenarios so you can budget accurately and decide whether to DIY or hire out.
Overview
Replacing an existing disposal is a 30-minute DIY job. Adding a disposal to a sink that never had one costs more because you need an electrical connection and possibly a new drain configuration. Here is the full cost breakdown for both scenarios so you can budget accurately and decide whether to DIY or hire out.
Cost Breakdown
Replacing an Existing Disposal (Simplest)
Disposal unit: $80-$350 depending on HP and brand. DIY installation: $0 -- the mounting ring from the old InSinkErator fits most new InSinkErator models. Disconnect the old one (twist off), connect the new one (twist on), plug in. 20-30 minutes. Plumber labor for a swap: $100-$200. Total with plumber: $180-$550. This is one of the easiest DIY plumbing jobs -- if your old disposal is an InSinkErator and the new one is too, the mounting hardware is identical. No tools beyond a screwdriver and an Allen wrench.
New Installation (No Existing Disposal)
- Adding a disposal where one has never been requires three things: the disposal unit ($80-$350), an electrical connection under the sink, and a drain modification.
- Electrical: if an outlet exists under the sink, you just plug in.
- If not, an electrician runs a dedicated circuit and installs a switched outlet -- $150-$300.
- Drain modification: the standard sink drain assembly needs a disposal mounting ring and the P-trap may need adjustment -- $30-$60 in parts.
- Plumber labor: $150-$300 for the disposal mount and drain connection.
- Total new installation: $250-$700 DIY (you handle the disposal, electrician handles the outlet) or $400-$1,000 with plumber and electrician.
Electrical Options
- Hardwired: the disposal connects directly to a switch-controlled circuit in the wall.
- Requires an electrician for the initial wiring ($150-$300).
- No outlet under the sink -- the wire goes directly into the disposal.
- Plug-in with switched outlet: an outlet under the sink is controlled by a wall switch.
- The disposal plugs into it.
- Easier to replace future disposals (just unplug and replug).
- Air switch: a pneumatic button mounted on the countertop connects to the disposal.
- No electrical switch on the wall.
- Popular for island sinks where running a wall switch is impractical.
- Air switch kits cost $25-$50.
What Adds to the Cost
- No existing electrical connection: $150-$300 for an electrician to run a new circuit.
- Switching from Waste King to InSinkErator (or vice versa): new mounting ring needed -- $15-$25 for the ring plus 30 minutes extra labor.
- Plumbing modification for a new disposal on a double-bowl sink: the drain tee may need reconfiguration -- $30-$60 in parts plus 30 minutes labor.
- Dishwasher drain reconnection: the dishwasher hose connects to the disposal inlet.
- If the new disposal has a different inlet height, the hose routing may need adjustment -- $0-$20.
- Old disposal disposal (ironic): haul-away is usually free with a plumber visit or $25-$50 for separate pickup.
Safety Warnings
- Not budgeting for the electrician when adding a disposal to a sink that never had one. The disposal needs a switched electrical connection -- that is not included in the plumber's quote.
Pro Tips
- Buy the disposal yourself and hire the plumber for installation only. You pay retail instead of the plumber's markup and get a wider selection.
- If replacing an InSinkErator with another InSinkErator, DIY is genuinely a 20-minute job. The mounting ring stays, the new unit twists on, and you plug it in. Watch a 5-minute video first.
- Bundle the disposal installation with other sink work (faucet replacement, drain repair) to minimize the service call premium. One plumber visit for multiple tasks is cheaper than separate visits.
- Check whether your municipality allows disposals. A few cities and some older septic systems prohibit them. Verify before buying.
Mistakes to Avoid
- Hiring a plumber to replace an identical-brand disposal. The twist-on, twist-off swap is the easiest DIY plumbing task. Save the $100-$200 service call.
- Not budgeting for the electrician when adding a disposal to a sink that never had one. The disposal needs a switched electrical connection -- that is not included in the plumber's quote.
- Buying a disposal without checking the mounting compatibility. InSinkErator and Waste King use different mount systems. Switching brands means new mounting hardware.
- Forgetting to knock out the dishwasher drain plug on a new disposal. The plug blocks the dishwasher from draining and is the number one post-installation problem.
Bottom Line
Replacing an existing disposal: $80-$350 DIY, $180-$550 with a plumber. New installation where no disposal existed: $250-$700 DIY (plus electrician), $400-$1,000 all-in with professionals. The disposal unit is the biggest cost variable. The labor is straightforward for replacements and moderate for new installs.
Frequently Asked Questions
What are expert tips for garbage disposal installation cost?
Buy the disposal yourself and hire the plumber for installation only. You pay retail instead of the plumber's markup and get a wider selection. If replacing an InSinkErator with another InSinkErator, DIY is genuinely a 20-minute job. The mounting ring stays, the new unit twists on, and you plug it in. Watch a 5-minute video first. Bundle the disposal installation with other sink work (faucet replacement, drain repair) to minimize the service call premium. One plumber visit for multiple tasks is cheaper than separate visits. Check whether your municipality allows disposals. A few cities and some older septic systems prohibit them. Verify before buying.
What mistakes should I avoid with garbage disposal installation cost?
Hiring a plumber to replace an identical-brand disposal. The twist-on, twist-off swap is the easiest DIY plumbing task. Save the $100-$200 service call. Not budgeting for the electrician when adding a disposal to a sink that never had one. The disposal needs a switched electrical connection -- that is not included in the plumber's quote. Buying a disposal without checking the mounting compatibility. InSinkErator and Waste King use different mount systems. Switching brands means new mounting hardware. Forgetting to knock out the dishwasher drain plug on a new disposal. The plug blocks the dishwasher from draining and is the number one post-installation problem.
What is the bottom line on garbage disposal installation cost?
Replacing an existing disposal: $80-$350 DIY, $180-$550 with a plumber. New installation where no disposal existed: $250-$700 DIY (plus electrician), $400-$1,000 all-in with professionals. The disposal unit is the biggest cost variable. The labor is straightforward for replacements and moderate for new installs.
What's the bottom line on garbage disposal installation cost?
Replacing an existing disposal: $80-$350 DIY, $180-$550 with a plumber. New installation where no disposal existed: $250-$700 DIY (plus electrician), $400-$1,000 all-in with professionals. The disposal unit is the biggest cost variable. The labor is straightforward for replacements and moderate for new installs.
How much does garbage disposal installation cost cost?
The typical cost range is $80-$1,000 depending on new vs replacement and DIY vs professional. Actual costs depend on your location, materials, and whether you hire a professional.