NF EN ISO 4157-3

This part of ISO 4157 establishes requirements for designation systems for rooms, areas, spaces, and voids in

buildings by room identifiers. It introduces a new designation concept intended for identification of rooms in a project

throughout its life cycle, i.e. the conception, programming, planning, erection, maintenance, remodelling and

demolition phases.

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• mandatory clauses to satisfy,
• non-essential but useful clauses to know, such as permissions and recommendations.

The identification of these types of clauses is based on the document "ISO/IEC Directives, Part 2 - Principles and rules of structure and drafting of ISO documents" as well as on a constantly enriched list of verbal forms.

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