Preheat oven to 375°F.
Sift flour, sugar, baking powder and salt into large bowl.
Add butter and rub in with fingertips until mixture resembles coarse meal.
Gradually add buttermilk, tossing with a fork until large moist clumps form.
Gather dough into a ball and divide into 4 pieces.
Shape each piece into 3-inch round.
Transfer to a parchment lined baking sheet, spacing evenly.
Bake biscuits until tester inserted into center comes out dry, about 20 minutes - the biscuits will be pale.
Transfer biscuits to a rack and cool.
Can be prepared ahead and rewarm in 350°F oven for 5 minutes.