Step height between 16 and 21 cm and all steps must be at the same height — the regularity of a staircase is fundamental!
Going  between 21 and 32 cm.
Headroom 190 cm minimum.
Stair width greater than 70 cm.
Balustrade Minimum height of 90 cm for the staircase (measured from the nosing of the step) and a minimum of 100 cm on a landing.
>Maximum distance of 11 cm between the support on the staircase and the bottom rail.
Vertical balustrade: maximum gap of 11 cm between each vertical bar.
Horizontal balustrade:
  • maximum gap of 18 cm between horizontal rails located above a solid section of at least 45 cm;
  • avoid the ladder effect so that a child cannot climb it.
  • wrought iron handrail: spaces between the scrolls and other shapes of the handrail must not allow a rectangular cuboid of more than 25 × 11 × 11 cm to pass through.
Landing Provide a rest landing when the flight exceeds 25 steps (in some cases, this requires offsetting the lower part of the staircase).
Size the landing to the width of the stair flight and to a minimum length of 1 m.
If your staircase is built between two continuous walls, the staircase must be fitted with an independent handrail.