removal and installation guide

Double Kitchen Sink Installation Guide

Installing a double kitchen sink can be a DIY job for handy homeowners. For our purposes here, we’ll assume that the sink hole has been cut at the factory. If you need to cut a hole in a laminate countertop or a substrate for a tile counter, see our Triple Kitchen Sink Installation Guide to instructions.

kitchen sink installation

To install a double sink, you’ll need:

  • The sink installation manual
  • Clamps included with the sink
  • Silicone caulk
  • Driver or screwdriver

Installing a Drop-in Sink

This job takes 30-60 minutes in most cases. Here’s a step by step guide.

  • Run a ¼” bead of silicone around the sink hole where the rim of the sink will rest
  • Install the sink through the opening, and press it down firmly and align it properly, then remove excess caulk with a cloth
  • Use the included clamps to secure the sink to the countertop
  • If installing a cast iron sink, consider adding additional supports
  • Tip: Refer to the Farmhouse Sink Installation Guide for how to install supports for a very heavy kitchen sink
  • Install the garbage disposal, if applicable
  • Install the drain lines

Installing an Undermount Double Sink

These sinks are slightly more challenging to install, but the job can be done in 45-90 minutes.

  • Turn the countertop or substrate upside down
  • Run a ¼” bead of silicone caulk where the sink will contact it
  • Place the sink in its proper location, and push down firmly
  • Install the clamps included with the sink
  • Tip: If installing screws in granite, quartz or similarly hard material, the holes will need to be pre-drilled, but you will have to control the depth to keep the holes from penetrating too far
  • Once the countertop is installed, excess caulk can be removed carefully with a utility knife
  • Install the garbage disposal, drain lines, dishwasher lines if applicable and sink accessories
  • Tip: If installing a cast iron, steel or other heavy sink, it will require additional support, and instructions for adding supports are located in our Farmhouse Sink Installation Guide

The Cost to Install a Double Kitchen Sink

If you’re having your kitchen remodeled, this cost is included in the whole, though it might not be itemized. When hiring a professional for sink installation alone, expect estimates in this price range:

  • Double sink installation cost: $100-$400

The simplest installation, the sink and two drain lines, will cost $100-$150. The cost will go up with the addition of appliances such as a dishwasher, disposal or tankless water heater. Installing a gas line for a tankless water heater might cost more than $400 by itself. See the double kitchen sink prices page for full information.

Double Kitchen Sink Installation FAQ

This double sink Q&A covers common questions.

What reveal do you recommend for my undermount sink?

First, let’s define reveal for those not familiar with the term. There are three options:

  • Flush or zero reveal means that the sink is installed so that the sides of the sink bowl are flush with the edge of the countertop
  • Negative reveal means that the sink opening is cut 1/16” to 1/4″ smaller than the length and width of the sink to produce a slight overhang of the countertop
  • Positive reveal means that the opening is cut slightly too large, so that the top of the sink bowl is exposed for decorative or cleaning purposes

Most building codes require surfaces of all food prep areas to be exposed for cleaning purposes, so some installers apply this to sink installation and create a positive reveal. Not all see it this way.

Most sinks are installed with a flush or negative reveal because a positive reveal creates an edge where food can accumulate and staining is possible. Plus, in time, the silicone might get stained, and it will be visible.

On the other hand, a negative reveal leaves an overhang that isn’t visible. It’s a place for mold to grow when food is splashed there. If you choose a negative reveal, popular because it makes it possible to brush food debris into the sink with less mess, be sure to remember the area beneath the overhang when cleaning your sink.

Can I have a handyman rather than a kitchen contractor or plumber install my sink?

It’s not the person’s title, but their experience, that you should pay attention to. Be sure that the installer you choose has good experience with the installation of a sink and drain plus any appliances and accessories you’re including. If a handyman does the job properly, you might save money. If the job is done incorrectly, a problem like leaking water can lead to very expensive repairs.

Should I install additional supports for my 42” stainless steel sink?

While it might not be required, it certainly won’t hurt. If you have a natural stone countertop, taking weight off of it is always a good idea.

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