BNS ISO 21542:2011 Building construction – Accessibility and usability of the built environment

This International Standard specifies a range of requirements and recommendations for many of the elements
of construction, assemblies, components and fittings which comprise the built environment. These
requirements relate to the constructional aspects of access to buildings, to circulation within buildings, to
egress from buildings in the normal course of events and evacuation in the event of an emergency. An
informative annex is also included which deals with aspects of accessibility management in buildings.
This International Standard contains provisions with respect to features in the external environment directly
concerned with access to a building or group of buildings from the edge of the relevant site boundary or
between such groups of buildings within a common site. This International Standard does not deal with those
elements of the external environment, such as public open spaces, whose function is self-contained and
unrelated to the use of one specific building, nor does it deal with single family dwellings, other than those
circulation spaces and fittings that are common to two or more such dwellings.