Drop-In Kitchen Sink Replacement

What You'll Need
Scale/inch tape
Marker pen
Silicone caulk
Mounting clips
Flexible tubes

Before going as far as fitting a drop-in kitchen sink replacement you need to take enough measurements to ensure your kitchen sink is going to fit into your countertop and is not going to cause problems with the cabinet below the sink.

Step 1 - Making Sure it Fits

Below are the measurements you should make: 

  • Measure your lower cabinets: you need the width and the depth
  • From front to back, a kitchen sink usually measures 22 inches in depth. This means that your cabinet needs to be 24 inches deep for your drop-in kitchen sink replacement to fit adequately. These 24 inches does not include the measurements of a splashback.
  • If you have a splashback you are going to have to choose a sink that has a depth, from front to back, of just 20 1/2 inches; unless you decide to change both cabinets and countertop as well as your kitchen sink.

Step 2 - Using a Template

The template is usually provided when you purchase your drop-in kitchen sink replacement. Position the template by placing it a minimum of 1 1/2 inches in from the front edge of your countertop. If your countertop is deeper you can place the template further back, although never more than 4 inches. Hold the template in place with some tape and then draw around it with a marker pen to mark the opening that needs to be cut out of the countertop so that you can slot the sink into the space made. 

Step 3 - Cutting out the Opening

Once you have drawn around the template, remove it from the countertop. You are now ready to cut out a hole into which you can add your drop-in your kitchen sink replacement. The easiest way to get this accurate is to drill a 3/8 inch diameter hole into each corner you have marked out. Screw a scrap of wood across the section you intend to cut out to ensure that the cutout piece is not going to drag its weight down as you cut. Start to cut along the inside edge of the line using a saber-saw blade. Once you have finished cutting, simply remove the scrap of wood holding up the cutout and lift it away, revealing the hole into which you are going to fit your drop-in kitchen sink replacement. 

Step 4 - Install the Sink

Now the faucets and sink strainers need to be fitted, a far easier job than leaving this until after you have fitted the sink. Turn the drop-in kitchen sink replacement over and apply some plumber’s putty all round the underside of the sink’s lip. You could also use silicone caulk. Once you have done that, turn the sink over and carefully insert it into the opening you have cut. You may need help to do this, especially if the sink is a heavy one. A word of warning here: be careful that you don’t trap your fingers as you ease the drop-in kitchen sink replacement into position. 
Step 5 - Attaching the Plumbing

Once you have the drop-in kitchen sink replacement positioned properly attach the mounting clips. This holds the kitchen sink close down against the countertop. The manufacturer’s instructions will help you place the clips in the right position. Now that your drop-in kitchen sink replacement has been fitted you just need to fit up the P-trap and the faucet pipes using the appropriate flexible tubes. The final job is to connect the waste line. Turn the water valves back on and flush the system without the aerators in place. Then, after running the water for a minute or two, reinstall the faucet aerators and the job is done.