How do I measure for a spiral steel staircase?

Measure the finished floor-to-floor height, the size of the floor opening and the diameter available, meaning how large a circle fits on plan. Mark on a sketch which side you want to step on at the bottom and off at the top, and where walls and doors are. We make spiral staircases from 1300 mm in diameter for a mezzanine up to 2000 mm for a main staircase, and calculate the number of steps and the rotation for your height. Use the spiral-stair measuring guide.