An enzie spiral stair is custom-made to suit your floor-to-floor height. There is no limit to the height of an enzie spiral staircase or Helical Staircase. However, building authorities may require a landing every 18 risers.  On a spiral staircase, we recommend increasing the column size of a spiral staircase depending on a number of factors such as the diameter, the number of fixings faces on the landing, and the floor fixing involved. enzie can assist you with specific information about all these variables as required for your application