What Size Undermount Sink Fits A 33" Cabinet? (Find Out Now!)

Undermount sinks add a modern elegance to any kitchen, and they are easier to clean than drop-in sinks. You can find several styles, such as one or two bowls, baskets, and off-set drains. The first step to finding the perfect undermount sink, though, is knowing the best size for your 33” cabinet.

For a 33” cabinet, install an undermount sink that is between 30” and 31” wide from left to right. This leaves approximately 2” to 3” around the sink inside the cabinet for mounting hardware and plumbing. If you already have an opening in the countertop, match the undersize sink dimensions to the opening or replace the countertop.

Let’s take a closer look at undermount sinks and how to find the best size for your 33” cabinet.

Before you decide on the best undermount sink for your cabinet, take accurate measurements. A drop-in sink has a lip around the edge, so you need to measure the cabinet and not the lip. The two measurements that you need for an undermount sink are the size of the opening in the countertop and the width of the opening in the cabinet.

In order to get an accurate measurement of the hole in the countertop, remove your drop-in sink. Next, measure the width and length of the countertop opening. Be sure to put the measuring tape against the inside edge of the opening.

Next, measure the length of the cabinet. Place the tape measure along the top outside edge of the cabinet. Measure from left to right.

After you verify the measurements of the cabinet and sink opening, you can decide on an undermount sink for your 33” cabinet. The general rule is that you should leave approximately 2” to 3” on either side of opening in the countertop. For a 33” cabinet, this means that you can install a 30” to 31” undermount sink. The extra space leaves room under the countertop for the undermount sink brackets. If the countertop already has an opening, you need to match sink size to the opening or replace the countertop.

Installing an undermount sink takes two people. If you are installing a new countertop and sink, install the sink first before the countertop. If you are replacing a drop-in sink, remove the old sink, as well as the brackets and epoxy.

Place the undermount sink on boards to hold it a few inches above the bottom of the cabinet. Apply a thick bead of undermount sink adhesive around the countertop opening. Lift the sink into position with the help of another person, and press it firmly against the countertop. Reposition the boards to keep the sink in place as the adhesive sets.

As an extra layer of security, use undermount sink brackets or clips to attach the sink to the countertop.

Related Questions

How do I finish the edges of my countertop around an undermount sink?

If you replace a drop-in sink with an undermount model, the edges of your countertop may need some attention. Granite and other hard materials can be buffed and polished. The edges of laminate countertops need to be refinished by a professional.

What type of countertop do I need for an undermount sink?

Undermount sinks are available for almost every type of countertop, including laminate. You may need some professional help with the installation and finishing.

How do I fix water getting between the countertop and an undermount sink?

Water between the countertop and undermount sink means that the sink does not have a tight seal. Make sure that the brackets or clips on the underside of the sink are secure. Tighten any that are loose and replace any that are broken. Apply a fresh bead of caulk around the entire underside edge of the sink. Spray a cleaning product for any mold around the edge of the sink and inside the cabinet.

Are undermount sinks more expensive than drop-in sinks?

Yes. Undermount sinks are more expensive than drop-in sinks. Expect higher costs for the sink and installation if you have a plumber do the work.

How long does it take to install an undermount sink?

For a DIY job to install an undermount sink, the job can take around three to four hours. This includes prepping the cabinet and countertop, attaching the sink with adhesive and letting it set, and securing the sink in place with brackets or clips. For comparison, installing a drop-in sink takes about one hour.

Undermount sinks give your kitchen a finished look, and they are easier to clean than drop-in models. The sinks are available with one or two basins, as well as cutting boards, drains, and baskets.

When you are considering an undermount sink, the first step is to take accurate measurements of the cabinet and countertop opening. The recommended sizes of undermount sinks for 33” cabinets are 30” to 31” to allow for 2” to 3” around the fixture.

Installing an undermount sink takes two people. Decide if you want a negative, positive, or zero reveal. Put the sink inside the cabinet on boards. Apply adhesive around the countertop opening, and push the sink against the adhesive. Finish the job with undermount sink brackets or clips.