Nadumuttom columns coming up

Picture shows four round columns for Nadumuttom coming up with earth work excavation,floor concrete,footing concrete in three stages of mat,footing and pedastal reaching upto brick wall level.Excavated pits are of 4 feet by 4 feet in length and width and not less than 4 feet in depth for all 23 concrete columns coming up in the house.Out of these 23 columns only two columns in the rear side for outside toilet and rear verandah are rectangular in size.All otheres coming up in visible areas are all round columns.But the foundation work of 4 level concrete is the same for all 23 columns