The statutory minimum height for a permanent roof guardrail is 1100mm from the roof’s walking surface. This height is strictly mandated by British and European safety standards BS EN 13374 and BS EN ISO 14122-3. To remain fully compliant, the system must also feature:

  • A top principal guardrail at 1100mm.
  • An intermediate mid-rail positioned so that the clear open gap between rails does not exceed 470mm.
  • A toe-board at the base if an existing structural upstand or parapet of at least 100mm is not present.