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Mezzanine Floor Staircases

Staircase Design
Staircase design is covered by (amongst others) BS5395: Part 1, BS5395: Part 3 and BS5950: Part 5.  General guidance on staircase design is also contained within the Approved Document K of the Building Regulations. Additionally, all staircase designs are required to conform to Approved Document M of the Building Regulations. Part M Regulations take precedence over those of Part K. For consideration of means of escape (MOE) in the event of fire, reference should be made to Approved Document B.

When using our price calculator you need to determine the number of stair landings required. Typical scenarios where they are required are as follows;

  • If stairs run parallel with the mezzanine edge then a top landing will be required.
  • If stairs turn 90degress then a mid landing is required.
  • If stairs turn 180 degrees then a double mid landing is required.
  • With a Disabled Persons (Part M stair) a mid landing is generally required. 

Building Regulations ‘Part M’ Compliant Handrail / Stairs
A Part M ‘ambulant disabled staircase’ will have the following characteristics. An ‘Access Statement’ will generally overcome the requirement to provide a Disabled persons Platform lift by siting the provision of an Ambulent Disabled Part M stair provision in lieu;


  • The rise of each step is between 150 – 170mm, and the going at least 250mm.
  • A maximum of 12 risers before a landing are required (up to 16 in small premises where space is restricted).
  • Materials for treads should not present a slip hazard, especially when wet.
  • Tread nosings should be highlighted with a permanently contrasting material 55mm wide on both the tread and the riser.
  • No doors should swing across landings.
  • Clear tread width should not be less than 1200mm and the landings at least 1200mm long.
  • The overlap of treads should be no more than 25mm and avoided if possible.
  • There is continuous handrail on each side of a flight and landings.
  • Handrail should extend safely at least 300mm horizontally beyond the top and bottom of a flight of steps.
  • The vertical height to the top of the upper handrail from the pitch line of the flight of stairs is between 900mm and 1100mm, and from the surface of a landing is between 900mm and 1100mm.
  • Its surface is slip resistant and not cold to the touch.
  • Its profile is either circular with a diameter of between 40mm and 45mm, or oval preferably with a width of 50mm.
  • The clearance between the handrail and any adjacent wall surface is between 60 and 75 mm.