Stairs riser
Part K of the building regulations requires that the rise, going, handrails, headroom, length and width of any stairs, ladders and ramps between levels are appropriate to afford reasonable safety to people gaining access to and moving about buildings.
Approved Document K - Protection from falling, collision and impact describes provisions that would satisfy this requirement. It defines the ‘rise’ of stairs as the height between consecutive treads, or for ramps, the vertical distance between each end of the ramp flight.
In a flight of steps, for all steps the measurements for rise and going should be as shown below.
All buildings should have level treads on steps, with the rise and going of each step consistent throughout a flight of steps. If stairs have more than 36 risers in consecutive flights there should be a minimum of one change of direction between flights.
Buildings other than dwellings should not have single steps. For flights between landings the maximum number of risers should be 16 risers for utility stairs and for general access stairs, 12 risers, but exceptionally no more than 16 in small premises where the plan area is restricted.
In buildings other than dwellings, risers should not be open, in order to avoid feet or walking aids being caught underneath the tread during ascent, possibly causing a fall or giving occupants a feeling of insecurity. In dwellings, steps may have open risers if treads overlap by a minimum of 16 mm and steps are constructed so that a 100 mm diameter sphere cannot pass through the open risers.
In buildings other than dwellings, step nosings should be made apparent using a visually contrasting material, a minimum of 55 mm wide, on both the tread and the riser. For common access areas in buildings that contain flats, risers should not be open and step nosings should be visually apparent, using a material that contrasts visually, 50 - 65 mm wide on the tread and 30 - 55 mm on the riser.
Where there are stepped gangways in assembly buildings, each step in the gangway should have a minimum height of 100 mm and a maximum height of 190 mm. If there are two or more rises to each row of seats, each step should be of an equal height.
See also: Stair rise.
[edit] Related articles on Designing Buildings
Featured articles and news
Specifying rendered external wall insulation for fire safety
How to interrogate the evidence provided to the specifier.
The benefits of writing articles for your organisation
How to create a profile for your organisation and publish for free.
No Falls Week. The importance of safe working at height
What to expect and what is on offer to avoid accidents.
Scottish Government action to reach net-zero targets
Retrofit expert group highlight critical actions needed.
A forward thinking, inclusive global community of members.
From engineered product life-spans, to their extension.
Circular economy in the built environment
A brief description from 2021. Where are we now?
Mental Health Awareness Week with ABS
Architects Benevolent Society programme of activity.
CLC publishes domestic retrofit competency framework
Roadmap of Skills for net zero.
May 13-19: Moving more for our mental health.
Understanding is key to conservation.
Open industry engagement survey seeks responses
Institutions and the importance of engagement.
National Retrofit Hub unveils new guide
Digital Building Logbooks and Retrofit: An Introduction.
Enhancing construction site reporting efficiency
Through digitisation and the digital revolution.