While you will mark the place where undermount sink will be installed, just keep ½ inch extra space or more. You can choose a new sink with a deeper basin than the existing sink has, but if it hangs down too low, it won’t drain properly and you’ll have to lower the sanitary tee connection in the drain line inside the wall. It does not apply to the undermount sinks alone, but it is also similar to the other types of sinks. Then you can decide how large the sink can be. Good to Know For best results, make a drawing of your old sink with all measurements including distances from the sink wall to the drain center to use as a shopping aid and reference. If you are planning to go for around sink then you have to measure the diameter too. How to Measure for a Bathroom Sink. Find out how to determine what size kitchen sink to buy when installing a new kitchen sink in an existing kitchen. The sink is an undermount stainless steel “organic shaped” Franke sink, with a smaller basin on the left [where the garbage disposal is located]. Take a flexible measurement tape so that you can easily measure some critical area for a better understanding. If your new sink has different dimensions and drain location(s) than the unit it'll replace, you may need to modify the countertop opening and/or plumbing. It is impossible to wash dishes in that little sink. Measure the tailpiece for buying a new kitchen sink. The countertops are granite. Then, choose a replacement with similar measurements. Then, follow the next steps to determine which faucets best fit your mounting setup. Measuring the Sink for New Countertop Installation. Just as the sinks are universal, so are the sink drains. Learn how to measure for a replacement kitchen sink. Whether you’re looking to just replace the sink and keep your current vanity or are looking for a new vanity/sink combo, the simplest approach is to start by measuring. Since it is only used to wash hands, shave and brush teeth, there is no need for a larger drain hole. Keep enough space for the faucet. Are undermount kitchen sink drains universal? This guide will kick off by measuring for a new drop-in sink, which is a common sink style to install in either a new vanity or your old one. In most cases, they measure three and a half inches wide. When choosing a new style, check your sink for the available mounting holes. If you want to have an undermount sink, you’ll need to measure the countertop space of your vanity. The curvy shape below will be measured from its widest point and by length. The drains are also available in a wide variety of finishes. A bathroom sink has a much smaller drain size. What can sometimes make bathroom sinks tricky, is the fact that some don't come with a drain. If you wanted a corner sink or a ledge like the example below and to the left, the fabricators will try to cut as much as possible into one solid piece. This will help you to install the sink properly. Measure the center section as if it was a square piece. Some new sinks will come with a template that you can use. First, measure from the width of the countertop. Step 2: Take Stock of the Sink and Mounting Holes Undermount Kitchen Sinks fit directly into the hole you measured, so you need to get an exact fit. Top-mounted sinks will have a lip so the basin measure on a new sink can be slightly smaller than the hole you measured. 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