In public spaces a step is a well-studied aid to change levels. Only if you encounter a step made without any thought or reference to the standards do you realise how uncomfortable life would be each time you needed to hop up or down a level. In the UK a step is described as part of the “The building Regulations” and the term used for compliance with disability law as being DDA (Disability Discrimination Act 1995)
How deep should a step be?
The depth of each step in a public space should be between 280mm and 425mm.
How high should a step be?
The height of a step in a public space should be between 150mm and 170mm.