Fannie Mae (FNMA)

[Robert from yahoo bd]

"Standard Base Cabinet Sizes
Height: Typically, standard base cabinets measure 34 1/2" H and 36" H from the floor to the top of the countertop when a countertop is installed. The toe kick portion of the cabinet is 4 1/2" H, the standard door height is 24" H, and the top drawer height is 6" H (equaling 34 1/2" H total). Three-drawer base cabinets have a 6" H top drawer and bottom/middle drawer styles are 12" H with a 4 1/2" H toe kick.
Width: The width of a standard base cabinet will come in multiples of threes between 9 inches and 42 inches. Depending on the use, this size will vary substantially.
Depth: The depth of base cabinets without a countertop is 24 inches. Base cabinets have a standard depth for easy access. When adding a countertop, there is often an overhang that can add another inch or two."

https://kitchencabinetkings.com/kitchen-cabinet-sizes

You would think that shorter cabinets would cost less for a builder, but I bet most cabinet suppliers charge more for non standard sizes and that cuts into builder profits unless the market will pay more through a higher sales price.