If it's a bedroom or bathroom, it stands for "Master." If it's a small room off of the kitchen or garage area, it means "mud room."
What does KS mean on a floor plan? Knee Space
Down
Floor plan mean Scottish plan. It shows the distance of room from the floor and physical appearance of room walls and all other features of rooms.
Water heater
poo extra
main panel
standard tile
Pulte Planning Center
"K.S." on a floor plan most likely stands for kitchen sink, indicating the location where the kitchen sink will be placed.
The only thing I can find for this is Storage Cupboard
Ceramic Tile Wall.
Look more closely. Does it say "AFF" perhaps? That means "above finished floor".