What Size Under Mount Sinks For 30 Inch Vanity?

What Size Under Mount Sinks For 30 Inch Vanity?

During home renovation, if you are considering finding the right size under-mount sink for your 30-inch vanity, you need to understand some important factors before buying one. 

Besides getting the right size vanity, it is also essential for you to choose the best size so you can get the perfect functionality. It is crucial to achieve comfort while getting ready in the daily routine or for the grooming process on the weekend. Under-mount sinks are recognized by their mounting style. Compared to others, these sinks are mounted to fit beneath the countertops without making a hole in the tops. The way they installed it on the countertop, no rim is left between the top and the under-mount sink. 

Installing the right size under-mount sink is vital to get enough countertop space to organize your necessary material. If you mistakenly mount the wrong size sink, you might not have enough space to place your products. In case of mounting the small size under-mount sink, your vanity top will get wet whenever you wash your face. 

To avoid such a situation, mount the right size under-mount sink for your 30-inch vanity. Let’s discuss the topic in detail so you don’t need to waste your time hanging the wrong size sink. 

What is the Standard size of under mount sinks for 30-inch vanity?

Under-mount sinks come in various sizes and shapes. Each size is suitable for their relevant size vanity. For 30-inch vanity, you need to consider some factors. If you want to mount the vanity with 30 inches width in your bathrooms, you will need to put your toiletries on the sides of the sink’s edges, on the top of your vanity. To get enough space, a sink with a 22-inches width that is leaving 4 inches of space around the sink to put all daily products. After mounting this size under-mount sink, the available space will allow you to decorate your bathroom vanity top with your favorite piece of products.

Still, if you want a smaller sink, you can mount the 20-inch wide under-mount sink, but the size should not be decreased. On the contrary, if you need to get a bigger sink, you can increase the width to 28 inches. Remember this size sink will not leave any countertop space to place the toiletries.

In addition to this, you need to consider some critical factors before buying the right size under-mount sink.


What factors must you consider before buying an undermount sink for 30-inch vanity?

To get the right size under-mount sinks, you need to consider some factors before buying under-mount sinks, which we will discuss below. 

Purpose of using under-mount sinks

Before buying your under mount sink, consider the purpose of your sink and decide who is going to use the sink. Do you need an under mount sink just for hand washing and brushing your teeth, or do you need to use that to bathe your pet or baby?

Depending on your purpose and needs, the size of under mount sinks for 30-inch vanity can vary from 22 inches to 28 inches. In addition, also think about your decorative desires. Whether you want to place the products for your daily use or while bathing your baby or pet, you need space to put the shampoo and soaps.

Material for under mount sink

When you step into the market, you will find the under-mount sink in various materials. From stone to composite metal, you can get it according to your desire. The under mount sinks made of porcelain and vitreous china provides a glossy appearance to your bathrooms, while stone under-mount sink enhance the luxuriousness of your property.  

Weight of under mount sink

The under-mount sink with different materials carries extra weight. For example, stainless steel and copper sink are lightest, while ceramic, vitreous china, and porcelain tend to be heavy. You can only choose the heavy under mount sink if your countertop is strong enough to carry the sink’s weight.


Under-mount sinks come in various colors. From matte black, gloss white, and any other color. Always select the one that is compatible with your countertop. You can also select the contrast color sinks to create drama. The stone countertops go particularly with the pure silvery hues of stainless steel and the caramelized brown colors of copper.


Under-mount sinks come in various shapes. These can be rectangular, square, or round. No matter what form you select, measure the space according to your chosen sink shape. You will find different Depths for each condition. It can vary from 5 to 9 inches.

How to measure the under-mount sink for 30-inch vanity?

Measuring the size of under mount sinks is slightly different than a drop-in sink. To take proper measurements for under mount sinks, follow the following steps.

  1. Start with the countertop. Generally, an undermount sink does not have any rim. Whether you want to mount the oval or a rectangular shape under-mount sink, your countertop will cover the rim. So you need the measure the space precisely in the countertop where you want to install the under mount sink.
  2. Then measure the vanity base from the inside. With the help of a tape measure, start counting the cabinet from left to right.
  3. In the next step, you need to determine the width of the sink, for example, for 30-inch vanity. If you want to mount the more oversized sink, you only need to subtract one inch, and the width of your sink will be 29 inches.
  4. Now, the length of the sink will be noticed. Its height can be determined by measuring the gap between the sink’s rear and front.
  5. Then, measure the sink’s height by making sure that there will be enough space for the drainage system.
  6. After the height, you need to focus on the depth of the sink. If it is different from the previously installed sink, then you will change the outlet point according to the depth of the new sink.
  7. Now, you can easily mount the under mount sink by considering the height of your faucet..


Back to blog