TS 4220-2 EN ISO 4157-2

TS 4220-2 EN ISO 4157-2 addresses the short designation system used in construction drawings for room names and numbers, covering rooms, areas, spaces and voids within buildings. In technical drawing and building documentation, a consistent way to identify a space helps different teams refer to the same location without ambiguity.

How room names and numbers work together

In general technical practice, a room name describes the function of a space, while a room number gives it a concise reference for drawings, schedules and coordination. This standard covers rules for short designation systems for room names and numbers, supporting consistent presentation across documents. That matters when a project includes offices, corridors, storage rooms, service spaces or other internal building areas that must be distinguished clearly.

Why this matters in building documentation

• Helps align references across plans, sections and layout drawings.
• Reduces confusion between rooms, areas, spaces and voids in multidisciplinary projects.
• Supports faster identification of spaces in everyday building use and project records.
• Promotes consistent terminology in architectural and engineering documentation.

Within the ISO 4157 family, this part focuses on how internal building spaces are designated on drawings. As a general principle, such designation standards make documentation easier to read and coordinate by bringing names, numbers and graphic references into a common system.