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 be16 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 16mm and steps are constructed so that a 100mm 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 55mm 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, 50mm to 65mm wide on the tread and 30mm to 55mm on the riser.
Where there are stepped gangways in assembly buildings, each step in the gangway should have a minimum height of 100mm and a maximum height 190mm. If there are two or more rises to each row of seats, each step should be of an equal height
 Related articles on Designing Buildings Wiki
Featured articles and news
Read about RSHP's British Museum extension which has been shortlisted for the 2017 Stirling Prize.
Read our introductory article to building a house extension.
More updates from DCMS about the large-scale testing of cladding systems and the number of buildings affected.
UandI secure resolution to grant planning consent for major new regeneration project.
IHBC article considers how heritage is dealt with when infrastructure schemes are authorised.
It was the tallest structure in the world for 3,800 years, but to this day the exact construction techniques are a mystery.
Shortlist for the industry's most coveted award announced.
Government responds to Mark Farmer's review of industry, rejecting the call for a levy on clients.
Peter Hansford to examine what wider lessons can be learned from the fire.
Every project is subject to uncertainty. How can construction better understand uncertainty for performance improvement?
MAD Architects reveal their designs for a futuristic campus for electric car manufacturer.
Homebuyers could borrow more with better forecasting of energy bills, according to industry consortium's new report.
Read our introductory article on carbon capture and storage.
Have a look at Frank Gehry's Binoculars Building in Los Angeles.