Garbage Disposal Installation with New Sink: Costs and What to Expect (2026)
Updated 2026-06-29
If you are replacing your kitchen sink and adding a disposal at the same time, plan on $500 to $1,200 total for a mid-range sink and a mid-range disposal in 2026. The logic is simple: the plumber is already under the sink connecting drain lines, so adding the disposal costs $150 to $300 in extra labor rather than a full separate service call.
Here is roughly how the visit unfolds when a sink swap and a disposal install happen on the same day.
- Scope and measure. The plumber confirms your new sink's drain opening matches the disposal flange, checks for an under-sink outlet, and asks whether you are keeping or replacing the existing disposal.
- Old sink comes out. The existing sink, faucet connections, and (if being replaced) the old disposal are disconnected and removed together.
- New sink goes in, disposal mounts. The sink is set and sealed, then the disposal attaches to the drain opening with the mounting ring included with the unit.
- Test run and cleanup. Water runs through the new drain connection to check for leaks, and the old sink and disposal are hauled away.
Combined cost breakdown
| Component | Typical cost |
|---|---|
| Kitchen sink (drop-in, stainless) | $150 to $500 |
| Kitchen sink (undermount, composite or cast iron) | $300 to $1,200 |
| Garbage disposal unit (1/2 to 3/4 hp) | $100 to $300 |
| Labor (sink and disposal together) | $250 to $500 |
| Faucet (if replacing at the same time) | $80 to $400 |
| Total project (mid-range everything) | $500 to $1,200 |
What changes when you add a disposal to a new sink install
- Drain knockout: Most sinks designed for disposal use come with a knockout hole on one basin. If yours does not have one, a plumber can punch or drill it, though stainless steel cooperates better than cast iron or composite.
- Drain configuration: A disposal needs a specific P-trap arrangement. Moving from a double-basin sink to a single basin with a disposal often means adjusting the drain rough-in, which adds time.
- Electrical outlet: Older kitchens sometimes lack an outlet under the sink. Adding one runs $100 to $300 and may require a separate electrician visit for a dedicated circuit.
- Mounting assembly: The disposal attaches to the sink drain with a strainer and mounting ring, both typically included with the unit. Confirm the sink drain opening matches the disposal flange size before purchasing either item.
Best time to add a disposal
The best time to add a disposal is when a plumber is already on site for something else. A concurrent sink replacement is the most common situation, but a faucet swap or pipe repair works too. Scheduling a disposal as a standalone job is fine, but you will pay a full service call rather than a short add-on. The math usually favors bundling.
Do all sinks work with a garbage disposal?
Any sink with a standard 3.5-inch drain opening can work with a disposal and the right mounting hardware. Shallow single-basin sinks and farmhouse apron sinks can limit which models fit due to clearance constraints below the basin. If you are buying a new sink specifically to pair with a disposal, look for models listed as disposal-compatible and measure the under-cabinet vertical clearance before ordering either one.
Can I keep my existing disposal when replacing my sink?
Yes, if the disposal is in decent shape. A plumber will detach it from the old mount, set it aside during the sink swap, and reattach it to the new mounting assembly. Labor for reusing an existing unit typically runs $80 to $150. If the disposal is over eight years old and already making noise or jamming periodically, this is the moment to replace it while the plumber is already under the cabinet. The garbage disposal lifespan guide can help you decide.
Double sink disposal considerations
Installing a disposal in a double-basin sink is standard practice. The disposal mounts on one basin, and both share a drain line through a common P-trap below the cabinet. It should not add significant cost beyond the standard labor rate, unless the existing drain configuration needs rerouting.
Get a quote from a licensed plumber who can look at your actual sink and cabinet before committing to a price. The garbage disposal labor cost guide tells you what a fair rate looks like in your market so you can recognize a bad one.
How long does a combined sink and disposal install take?
A standard drop-in sink with a disposal runs two to four hours of plumber time. An undermount sink that requires silicone curing and countertop support can take most of a morning. A new faucet at the same time adds 30 to 60 minutes. Clear the kitchen for the day and avoid scheduling when you need the sink by early afternoon.
Frequently asked questions
Should I buy the sink and disposal from the same place?
Not necessarily, but confirm the sink's drain opening (3.5 inches for disposal compatibility) matches your chosen disposal's flange before either purchase ships. Buying them separately is fine as long as that measurement lines up.
Can the plumber reuse my old faucet with a new sink?
In most cases, yes, as long as the faucet is in good condition and the new sink has compatible mounting holes. Reusing the faucet saves the $80 to $400 a new one would add to the job.
What happens if there is no outlet under my sink?
An electrician adds one for $100 to $300, and this is worth scheduling for the same day as the sink and disposal work so the plumber is not left waiting on power to test the unit.
Does a farmhouse sink work with a garbage disposal?
Often, but the apron-front design and deep basin can leave less vertical clearance under the cabinet than a standard drop-in sink. Measure before ordering a taller disposal model to pair with one.
Bottom line
Adding a disposal during a sink replacement is the obvious play on labor savings in 2026. Budget $500 to $1,200 total for a combined mid-range sink and disposal. Get itemized quotes, nail down the electrical situation under your sink before ordering any equipment, and plan both the sink and disposal together so the plumber arrives with everything needed for a single visit.
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