I'd be looking at 16 to 18.

Kitchen drain height. However, the height can vary based on the height of the counter and the depth of the sink. It also leaves enough room for both the hot and cold. It might vary due to sinking depth and sizes.

Supply line (vertical) 8 ¼”. With a drain so close to. The normal height for bathroom sink drains generally varies between 18 and 20 inches.

I was just wondering if there is any sort of standard height for the drain line. The standard kitchen sink plumbing has the kitchen sink drain about 28 inches from the floor. For the correct bathroom or kitchen sink plumbing rough in.

Most cabinets have a kick toe of 6 inches so you'd only have 6 inches to install and work the trap. 12 inches above the floor is really cutting it close. The drain line into the wall cannot be higher than the waste line from the disposal.

20.5 from the 34.5 tall cabinet should put your at 14 above finished floor. Water supply lines are normally installed to the side of the drain line a few inches. This varies based on the vanity, sink, and trap.

How far below the bottom of a sink should the drain. The most common kitchen counter height is 36 inches, but it can vary from 30 to 45 inches. 2” to 3” higher than the drain.