Preheat oven to 400 degrees F (200 degrees C).
In a bowl, mix the flour, baking powder, baking soda, salt, and sugar. Cut in 1/2 cup butter until the mixture resembles coarse crumbs. Mix in the buttermilk. Turn out onto a lightly floured surface, and knead 2 minutes. Transfer to an ungreased baking sheet, roll into a 6×6 inch square, and cut into 12 even sections. Do not separate.
Bake 15 minutes in the preheated oven, until a knife inserted in the center ofthe square comes out clean. Separate into biscuits, and serve hot.
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