Converting Double Sink To Single With Garbage Disposal

Using a double sink is quite convenient since you can wash utensils on one side and use the other as a dryer space. But the situation is the opposite for larger utensils, and that’s when the need for installing a single sink arises!

The large size of single sinks makes it easy to wash large utensils. No wonder installing a single sink with a garbage disposal is a dream come true for most people. That said, if you’re willing to convert your double sink to a single one, this guide highlights the stepwise process for that.

So, gear up, and let’s begin!

Is it Possible To Install a Single Sink With a Garbage Disposal Unit?

Of course, you can effortlessly install a single basin with a garbage disposal in your kitchen. In fact, connecting garbage disposal to single sinks is much easier as compared to double ones. However, you need to ensure that there is enough space beneath your sink so that the disposal unit fits properly.

Also, electrical wiring should be available below the sink, and the switch to manage the unit should be easily accessible. If your kitchen sink meets all these requirements, it won’t take you long to install your single sink and the disposal unit.

Important Things to Consider

Kitchen sinks, taps, and pipes vary in size. Whenever you decide to convert a double sink to a single one, the first thing you must check is the configurations of the sink. Relax! That doesn’t mean you need to do some technical measurements! You just need to keep in mind a few things/ measurements.

First, if you are opting for a deeper sink than the current one, you might need to lower the drain outlet to a height lower than the sink. Next, be careful while picking the sink. It is advisable to go for a sink that would fit in the current sink space. That way, you will be saved from making alterations to the existing countertop.

Finally, you will also need to purchase a garbage disposal unit that goes well with your new single sink if you haven’t got one yet.

Removing the Old Double Sink


Before jumping to the installation process, you need to detach the old basin. Note that it’s not about simply disconnecting it from the countertop. You will have to keep in mind the following things:

  • Measure the height of your old sink to make sure that you buy a new one of a similar height.
  • Carefully disconnect all the parts beneath your kitchen sink.

Once you are done with the detaching part, it’s time to dive into the installation process.

Installing the Single Sink

Mounting a new single sink to your kitchen countertop is a no-brainer! You can get the job done in less than three hours, provided you’ve got the correct tools and confidence!

In this section, you’ll find the list of the necessary tools and the step-wise installation process. So, without any further ado, let’s begin!

What do you need?

You don’t need any fancy engineering or plumbing tools to convert your double sink to a single one. You can complete the process with a few tools that are available at home. In case you lack any, they can be easily sourced from a nearby store.

So, here is what you’ll need:

  • A garbage disposal unit
  • Channel-type pliers
  • Cloth or rag
  • Utility knife
  • Screwdriver
  • Plumber’s putty with putty’s knife
  • Wire strippers
  • Electrical tester
  • Wire nuts
  • Hammer

Installation Process


Now that you’re ready with the tools, it’s action time! Below are the stepwise instructions to install a single sink with disposal:

  1. Get rid of all unnecessary stuff under your sink. Remove everything from the cupboard to ensure there’s enough space to work below the sink.
  2. Power off the disposal unit’s circuit breaker.
  3. Confirm that no current is passing through the breaker using the electrical tester. If the tester doesn’t light up, there is no current. However, if it lights up, power it off.
  4. Grab your pliers. Separate the P-trap and drain extension coupling from your sink’s underbelly. Keep the drain parts aside. You can plug the cloth in the drain line to stop the odor.
  5. Unscrew the nut below the drain coupling to separate the drain flange and sink.
  6. Grab your putty knife, scrape off all the old plumber putty from the kitchen wall, and spread the new plumber putty on the sink flange.
  7. Attach the flange to the hole of your sink. Push the backup ring and gasket into the open sleeve of the flange below the sink.
  8. Join the mounting ring, snap it, and tighten all the screws till the unit is fixed tightly.
  9. If any excess putty is left, get rid of it.
  10. If you’ve got a dishwasher, push out its knockout plug located on the side of the disposal unit. You can use the hammer and screwdriver for this. If there is no plug, leave it as it is.
  11. Remove the disposal unit’s wiring section cover and insert a 6-inch electric wire from the wall switch into the wire clamp in the compartment. Fasten it with a screwdriver.
  12. Unsheathe the 6-inch wire inserted into the wiring section. You’ll need wire strippers and a utility knife to get rid of at least half an inch of the insulation from each wire.
  13. Next, connect the cable wires such that the white wire is connected to the white one of the disposal unit, and the black cable wire is linked to the black one.
  14. Fold the wires into the wiring section and close it.
  15. Fix the disposal unit on the mounting ring such that the outlet faces the sink’s drain pipe. Revolve the mounting ring to ensure the connection is tight.
  16. Hook the disposal charge tube to the outlet and fasten the coupler using pliers.
  17.  Remove the cloth from the drain line. Then connect the extension pipe and P-trap.
  18. If you have a dishwasher, hook its drain pipe to the knockout and fasten the coupler.
  19. Finally, switch on the circuit breaker and start your tap. If there are no leakages, your setup is ready for use.

A quick tip: The process of installing the sink and disposal unit is pretty fast and straightforward. However, some disposal units require a slightly different installation process. So, before going with the above steps, refer to your disposal unit’s user manual.

What’s the Cost of Installing a Single Sink with Disposal?


Most of you must be wondering that you will need to shed off several bucks to convert your double sink to a single with a disposal unit. But that’s not true!

The disposal unit costs the most, and you can get it for $80 to $300, depending on the model and brand. Next, the installation will cost you about $250 if you call a plumber. Otherwise, you can follow the process mentioned above and get it done for free!

So, if you are not confident enough, you can call up a professional. Despite that, you can get the entire setup ready in less than $500!

Is it Possible to Install Garbage Disposal Unit with Dishwasher?

Yes, you can install a garbage disposal unit with a dishwasher even if you use a single sink. When you connect the dishwasher with the disposal unit, the drained water released by the dishwasher passes through the disposal unit. Eventually, this prevents the pipes from clogging for a longer time.

If you have enough space beneath your sink, you can effortlessly attach a single sink with a disposal unit and dishwasher.

Maintaining the Garbage Disposal Unit After Installation

After installing the garbage unit, you need to take care of it regularly to avoid damage or clogging. The following tips will help you maintain the disposal unit so that you can use it without any hassle for years!

  • Keep the water supply off until the disposal unit crumbles the garbage. Once the grinding stops, wait for at least 15 seconds before turning on the water supply.
  • Avoid using harsh, chemical-based cleaners like bleach or drain cleaners.
  • Do not leave the garbage disposal unit for a longer period without using it. Otherwise, it will get rusted.
  • Rinse the disposal system for half a minute after turning it off.
  • Cut the large pieces into smaller ones for faster and better grinding.
  • Run hot water down the drain once a week to avoid clogging in the disposal unit.

Final Thoughts


Converting your double sink to a single with garbage disposal doesn’t require you to be a professional. It is a simple, budget-friendly process that you can do with a limited number of tools.

So, if you’ve always wanted to wash your large utensils in a large sink peacefully, this is your chance! Follow the steps mentioned in this guide, and you can successfully install a single sink in your kitchen.

What are you waiting for now? If this guide got you excited, grab the tools and equipment you need, and get started with the installation!