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Staircase Building Regulations

     Staircases come in all sizes, shapes, and materials and can be custom-made to suit your property. However, it’s important to ensure that a staircase is not only visually appealing but also safe to use. This is where building regulations play a crucial role.

     UK stair regulations are designed to ensure safety, comfort, and consistency. While design choices can vary, every domestic staircase must comply with these rules to meet Building Control approval.

All technical information below taken from:
The Building Regulations 2010 Approved Document
Part K1 – Stairs, ladders, and ramps
2013 edition for use in England

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Approved Document K – Protection from falling, collision and impact
Building Regulations 2010 (2013 edition, England)

Domestic staircase definition and explanation

     In UK Building Regulations, a domestic staircase is defined as a stair intended for use within a single dwelling. This means it serves one house or flat only and must be located entirely within that property.

    Because of this, domestic stairs are often referred to as private stairs in regulatory documents.

Your Steps

     All steps must have the same rise (the vertical distance between steps).

• The maximum rise of a step is 220mm
• The going (tread depth) must be between 220mm and 300mm
• All steps must be level
• The nosing (step edge) should not exceed 25mm
• Open risers must prevent a 100mm sphere from passing through
• The pitch of the staircase must not exceed 42°

     As a general rule, twice the rise plus the going (2R + G) must fall between 550mm and 700mm. While this rarely causes issues, it can become a limiting factor in tight or complex layouts

Kite Winders

     Kite winders are a type of winder tread used where a staircase changes direction without the use of a full landing. They allow the staircase to turn while reducing the overall space required.

     A staircase with kite winders typically combines straight treads with tapered winder treads. To comply with building regulations, all winder treads must be equal to or greater than the straight treads, and the going must remain consistent across the flight.

     Due to the strict 2R + G rule, some kite winder configurations may not comply with regulations. In such cases, alternative winder layouts or design adjustments may be required to achieve compliance.

Width

     UK regulations do not specify a strict minimum width for domestic staircases.

     However, for comfort and usability, main staircases typically range between 850mm and 950mm.

     For loft conversions, a minimum width of 600mm is commonly accepted, with 700–750mm preferred where space allows.

     On staircases with turns, individual flights may vary in width.

Headroom

     A minimum headroom of 2000mm must be maintained at all points measured vertically from the pitch line of the staircase.

     In loft conversions where space is restricted, reduced headroom may be accepted, provided:

  • At least 1900mm is available at the centre line

  • A minimum of 1800mm is maintained at shoulder height

     These allowances apply only to loft conversions and are subject to Building Control approval.

Landings

     Landings are essential for safety and visibility when using a staircase.

     They may act either as:

  • A turning point between flights

  • A continuation of the floor at the top or bottom of the stairs

     In all cases:

  • A landing is required at both the top and bottom of the staircase

  • The landing width must be at least equal to the narrowest flight

  • Landings must be level

  • No door may swing closer than 400mm to the edge of a step

  • Landings must be free from permanent obstructions

Handrails and Balustrades

     Handrails are a critical safety requirement and are mandatory where there is a risk of falling.

     Key requirements include:

  • Handrail height between 900mm and 1000mm, measured from the pitch line

  • A handrail is required where there is a drop of more than 600mm

  • Staircases wider than 1 metre require handrails on both sides

  • Balustrades must prevent a 100mm sphere from passing through

     Designs that can be climbed by young children are not permitted in domestic settings.

Nosings

     The nosing is the front edge of the tread that may project beyond the riser below.

   

     For closed riser staircases, there is no minimum nosing projection required. A staircase may be designed with no nosing at all, provided it complies with the remaining dimensional rules. Where a nosing is used, it must not project more than 25mm beyond the tread below.

     For open riser staircases, a nosing projection is generally required to improve safety and compensate for the absence of a full riser. In practice, this is typically achieved with a minimum projection of approximately 16mm, while still remaining within the maximum permitted 25mm.

Open Riser Staircases

     Open riser staircases must be designed so that a 100mm sphere cannot pass through any gap.

     This often requires the use of:

  • Partial timber risers, or

  • Metal riser bars

     On straight open-riser staircases, treads must overhang by at least 16mm to meet regulations.