Among all the room placements discussed in traditional Vastu Shastra, the kitchen is one of the more settled ones — Southeast is almost universally recommended as the ideal direction, sometimes referred to as the Agni corner, named for the element of fire it's traditionally associated with. Northwest is the commonly cited secondary option where Southeast isn't available in the plan.
The logic given in traditional texts follows the elements: Southeast is governed by Agni, fire, which is considered the natural energy of a working kitchen — cooking, after all, is an act of transformation through heat. Northeast, by contrast, is traditionally reserved for water and prayer energies, and is one of the directions most consistently advised against for a kitchen, since fire and water placed together are considered to work against each other.
Beyond direction, traditional guidance extends to the cook's orientation while working at the stove — facing East is generally recommended — and to keeping the kitchen visually and physically separate from the home's water sources and prayer space, reinforcing the same elemental logic that governs the room's placement in the first place.
As with any single-room guideline, this is traditional reasoning offered for reference, not a fixed rule that overrides a home's actual structural layout. Where Southeast isn't available, a qualified Vastu consultant can advise on remedies specific to the space rather than a placement that simply isn't possible to change.