- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 20 Nov 2018
Approved Document K - Protection from falling, collision and impact defines the ‘nosing’ of stairs as ‘the leading edge of a stair tread’.
[Image: The elements of stairs]
For buildings other than dwellings, step nosings should be made visually apparent by using a contrasting material on both the tread and the riser a minimum of 55 mm wide. If possible, step nosings that protrude over the tread below should be avoided. If the nosing does protrude, it should be by no more than 25 mm
[Image: Examples of suitable tread profiles]
For common access areas in buildings that contain flats 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. A suitable tread nosing profile, should be used.
Approved document M, Volume 1: Dwellings (2015 edition incorporating 2016 amendments), defines a ‘suitable tread nosing’as; ‘Nosings that conform with one of the options shown in diagram 1.2 of approved document K’
 Find out more
 Related articles on Designing Buildings Wiki
Featured articles and news
BSRIA study reveals strong growth in 2018.
Modern slavery in the construction sector.
What to bear in mind when claiming damages in construction.
How do we achieve sustainable clean-water infrastructure for all?
What you should know when appointing an architect.
A brief history plus some new developments.
How computational fluid dynamics (CFD) helps building design.
The Hong Kong Harbour Area Treatment Scheme (HATS).
'Expressions of interest' for construction contracts.
Dame Judith Hackitt confirmed as keynote speaker – one year on from the Hackitt Report. Save £100 on tickets.