The Ultimate Guide to Kitchen Sink Drain Height Measurement

What is the ideal kitchen sink drain height? For a single vanity sink, 20 to 24 inches of drain height is the standard. However, there can be a variance in the double sink vanity.

We do not think twice about the sink drain height in most cases. But when it’s about plumbing, it is one of the most critical factors that impact your bathroom’s functionality. If the kitchen sink drain is not installed correctly with measurement, it could also cause leaking.

Here’s our complete guide on how to choose the correct drain height for your kitchen sink.

Kitchen Sink Drain Height Size

kitchen sink drain pipe height

The standard kitchen sink drain height from the floor is the minimum height of a drain opening in a kitchen sink that allows water to flow freely without any obstructions.

A standard height of a kitchen sink drain system from the floor is 20 to 24 inches. The size of the drainage system depends on the type of installation you have chosen.

However, the standard sink drain height for a double sink vanity is 22-24 inches, the same as two toilet flushes.

Kitchen Sink Drain Height From Floor

Based on the vanity, sink, and trap, the standard kitchen sink drain height code from the floor ranges from 20 and 24 inches.

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Standard kitchen sink drain pipe height from floor is the height of the sink’s drain when it is at its lowest point.

It can be calculated by taking the distance between the floor and the bottom of a standard kitchen sink, then dividing that distance by two.

In a drop-in installation, the sink and drain are separate units that can be installed without any problems. But if you are installing a sink under your cabinet, it will be more challenging to install. Because the area needs to be larger.

For an under-mount installation, you need to cut holes in your cabinets for installing the waste pipes and then use PVC as your drain pipe material.

However, for a wall mount installation with a floor model base unit, the dimensions should not exceed 24 inches x 15 inches x 18 inches (WxHxD).

Kitchen Sink Drain Height with Disposal

The standard kitchen sink drain height with garbage disposal is 7-3/16 inches. It is the standard used by all manufacturers of kitchen sinks and disposals.

The drain height refers to the vertical distance between the bottom of the sink opening and the bottom of a waste disposal unit.

For instance, if you have a standard cabinet under your sink, it will be one inch above the countertop because you can use up to 1-1/4 inches of space for kitchen sink plumbing height. The same rule applies when installing a waste disposal unit into an existing cabinet – there should be at least one-inch clearance from the cabinet’s upper edge (the side opposite from where your hand goes) for drainage purposes.

The primary purpose of using this much space for kitchen sink plumbing height is so that water doesn’t collect on top of it and cause blockages and leakages in pipes below. Suppose there isn’t enough room available under your sink. In that case, you might need to install new flooring or create some built-in storage area (such as cabinets) above your existing work surface so that everything can fit inside easily and still provide adequate space for piping needs.

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Frequently Asked Questions (FAQs)

What is rough in height for sink drains?

The rough-in length needs to determine by how far you want to install your drain. Generally, the average rough in height varies from 20 to 24 inches from the floor.

What is a standard sink drain size?

There are different standard sizes for the drain holes in a sink. A standard kitchen sink drain size is usually 1.25 inches with widths of 1.5 inches and 1.625 inches.

How do you measure for a sink drain?

If you are using a tape, place your thumb at one end of the tape measure. Then lay it down so that it’s parallel to the ground. Mark this point on both sides, with your thumb marking each end. Place one leg over one mark, and stretch out the other leg to touch the second mark. Then, measure from your first-hand position to where you stretched out your second-hand place, which will be halfway between these two marks.

What height should kitchen sink drain stub out?

The ideal height for a kitchen sink drain stub out is 12 inches from the floor. And it ensures that there will be enough water to rinse them off when washing dishes and not create any clogs or overflows.


The standard measurement for a kitchen sink drain height is 20 inches. However, this is not always correct because of old pipes, drains, or any other obstruction in your drainage system.

However, it would help to consider that different kinds of sinks with different dimensions can affect your measurements. You should measure your sink to see if it complies with the required standards. Make sure you don’t end up having too high or too low a drain height.

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