Undermount Sinks Only

This is not just about will my sink fit. It is about will my sink and faucet fit. Here we will take a look at the depth and the width in different sections. In the Depth section I will be talking mostly about vanity sinks and in the Width section I will be taking about kitchen sinks. These seem to give me the biggest issues with fitting the sink in the cabinet.

I have looked at quite a few different manufacturers and no one labels the sink dimensions the same. One has the width as left to right and another has it front to back. So that said we will use depth as front to back and width as left to right.


Lift rod hitting backsplashI know everyone wants the biggest sink that they can possibly fit on or under their counter. You look at a sink and it says it is 17″ x 14″. A 14″ sink should fit in my 19″ deep counter. Well guess what the sink is not 17 x 14 it is actually 19 1/4 x 16 1/4. The cutout is 17 x 14. Also if you really look at a 14″ sink fitting in a 19″ deep counter this also won’t fit. Take a look at your cabinet for a minute. We need to fit a sink and a faucet inside of that cabinet. So we have an 18″ deep cabinet with a front frame of about 3/4″ and also a board in the back of the cabinet again about 3/4″ now add this up and we get 1 1/2′ of frame/board take that away from the 18″ deep cabinet and we get 16 1/2″. Now we need to fit the 14″ sink and faucet in there. NO WAY and really that 14″ deep sink that is really 16 1/4″ deep will be a tight fit in a 21″ deep cabinet but will fit with most faucets. Please note the last part MOST FAUCETS. If this is what you are using please make sure you have a lever (For the drain stop) that pulls straight up and not on an angle like the photo.

To the right or below depending on PC vs Cell is a nice little Calculator I made to help you figure out if your sink and faucet will fit. The one thing I am assuming in this is that your faucet is no bigger than 2  1/4″. If it is bigger than please adjust for it. As for how I get these numbers:

What we need to look at is the area between the sink and the splash. Here is where we mount the faucet and how much room do we need for it is the big question. My answer is 2  3/4″ – 4″ for most faucets. Most faucets are 2″ – 2  1/4″  wide at the base but I have seen some as big as 2  3/4″ that also need an extra 1/2″ – 3/4″ to turn the handle on full. This is why I use 2  3/4″ – 4″ as being tight depending on your faucet. Now your gonna tell me I drill a hole that’s 1  3/8″ and I could drill this tight to the sink but your plumber needs room for the nuts and washers so I am sticking to 2  3/4″ as the minimum amount needed.


Now we are going to look at if the width of our sink will fit. Like above we are looking at the cabinet vs the overall size of the sink but here I will be talking mostly about kitchen sinks. With most under-mount sinks we need an extra room mounting clips. With vanities an oval type sink would require an extra 2″ vs a kitchen or vanity rectangle sink  which requires an extra 3″. We also need to take into account the sides of the cabinet. Most cabinets have 3/4″ to the inside of the cabinet wall. Be it a solid 3/4′ side or a 1/2′ side set in 1/4″ from the edge of the frame. Lets put all of this together using a 36″ cabinet. A 36″ cabinet minus 1 1/2″ (3/4″ for each side) and 3″ for clips leaves us with 31 1/2″ for the biggest sink that cabinet will hold. Well now your gunna tell me your friend has a 33″ cabinet with a 31 1/2″ sink in it. This is where we look at how to mount that sink.

Mounting the sink to the counter

The way we mount the sink could change the size of the sink that will fit. Below are 3 different ways of mounting a kitchen sink. Naturally we prefer the first one because if anything were to happen to the sink it could be replaced easier than the other two which would require removal and reinstalling the counters.