Mezzanine Floors

Mezzanine Floor Staircases

Part K Mezzanine Staircases

An Onorin approved inspector can advise on the regulations and show us instances where a simpler Type K staircase may be an acceptable alternative or situations where a single ADS may alleviate the need for a lift.

Approved Document Part K requirements:

  • No restriction on rise between flights
  • 400mm clearance between landings and door swing
  • 190mm maximum riser
  • 250mm going of each step
  • Open risers
  • 900mm wide treads

National Building Specification (NBS) Part K: Protection from falling, collision and impact.

  • Mezzanine Floor Staircases
  • Mezzanine Floor Staircases