Also see:

6.6.7Headroom and width

Staircase openings shall be adequately sized.

Stairs should have a minimum of 2m clear head room (H) over the entire length and width of the stairway and landing, as measured vertically from the pitch line or landing.

The overall floor opening should be checked off plan and on site prior to the stairs being installed:

  • for size to accept the stairs, with sufficient clearance to enable installation
  • to allow for sufficient headroom.

Where staircases form part of a means of escape, reference
should be made to the relevant building regulations.