ISO 21542:2011规定了构成建筑环境的许多建筑元素、组件、组件和配件的一系列要求和建议。这些要求涉及进入建筑物的通道、建筑物内的流通、正常事件过程中的建筑物出口以及紧急情况下的疏散等施工方面。它还涉及建筑物无障碍管理的各个方面。 ISO 21542:2011包含与从相关场地边界边缘或公共场地内此类建筑群之间进入一栋或一组建筑直接相关的外部环境特征相关的规定。它不涉及外部环境的要素，如公共开放空间，其功能是独立的，与一栋特定建筑的使用无关，也不涉及单户住宅，但两栋或更多此类住宅共用的流通空间和配件除外。

ISO 21542:2011 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. It also deals with aspects of accessibility management in buildings. ISO 21542:2011 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. It 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.