Preheat oven to 425°F. Line a baking sheet with parchment paper, or place a cast iron skillet in the oven to preheat.
In a large mixing bowl, combine flour, salt, baking powder, and baking soda.
Cut in the cold butter using a pastry cutter until the mixture resembles coarse crumbs. Make a well in the center and add cold buttermilk.
Stir until the dough pulls away from the sides of the bowl. Turn onto a lightly floured surface and knead gently until no longer sticky.
Roll dough to ¼ inch thick. Cut with a 3¼-inch flour-dipped biscuit cutter, pressing straight down without twisting.
Gather scraps, re-roll, and cut more biscuits.
Place biscuits on the prepared baking sheet, or carefully remove the hot cast iron skillet and place biscuits directly in it. Bake 12–15 minutes until golden brown.
Serve warm.